Generate and return the variance of the input sample of type complex or real of shape (nsam) or (ndim, nsam) or (nsam, ndim) where ndim is the number of data dimensions (the number of data attributes) and nsam is the number of data points.
More...

Detailed Description

Generate and return the variance of the input sample of type complex or real of shape (nsam) or (ndim, nsam) or (nsam, ndim) where ndim is the number of data dimensions (the number of data attributes) and nsam is the number of data points.

See the documentation of the parent module pm_sampleVar for algorithmic details and variance definitions.

Parameters

[in]	sample	: The input `contiguous` array of shape `(nsam)`, `(ndim, nsam)`, or `(nsam, ndim)` of, type `complex` of kind any supported by the processor (e.g., CK, CK32, CK64, or CK128), type `real` of kind any supported by the processor (e.g., RK, RK32, RK64, or RK128), containing the sample comprised of `nsam` observations each with `ndim` attributes. If `sample` is a matrix, then the direction along which variance is computed is dictated by the input argument `dim`.
[in]	dim	: The input scalar `integer` of default kind IK representing the dimension (`1` or `2`) of the input `sample` along which the mean must be computed. If `dim = 1`, the input `sample` of rank `2` is assumed to have the shape `(nsam, ndim)`. If `dim = 2`, the input `sample` of rank `2` is assumed to have the shape `(ndim, nsam)`. The input `dim` must always be `1` or missing for an input `sample` of rank `1`. (optional. If missing, the variance of the whole input `sample` is computed.)
[in]	weight	: The `contiguous` vector of length `nsam` of, type `integer` of default kind IK, or type `real` of the same kind as the input `sample`, containing the corresponding weights of individual `nsam` observations in `sample`. (optional. default = `getFilled(1, size(sample, dim))` if `dim` is present, or `getFilled(1, size(sample))` if `dim` is missing.)
[in]	correction	: The input scalar object that can be the following: The constant fweight or an object of type fweight implying a bias correction based on the assumption of frequency weights for the sample observations, even if the `weight` argument is missing. This is the most popular type of correction, also known as the Bessel correction. The constant rweight or an object of type rweight_type implying a bias correction based on the assumption of reliability weights for the sample observations. (optional. If missing, no bias-correction will be applied to the output `var`.)

Returns

var : The output object of type real of the same kind as the input sample of rank rank(sample) - 1, representing its variance:

If sample is a vector, the output var is a scalar.
If sample is a matrix, the output var is an allocatable vector of size ndim = size(sample, dim).

Possible calling interfaces ⛓

: use pm_sampleVar, only: getVar

var = getVar(sample(:), weight = weight(1 : size(sample)), correction = correction)

var = getVar(sample(:,:), weight = weight(1 : size(sample)), correction = correction)

var = getVar(sample(:), weight = weight(1 : size(sample, dim)), correction = correction)

var(:) = getVar(sample(:,:), dim, weight = weight(1 : size(sample, dim)), correction = correction)

pm_sampleVar::getVar
Generate and return the variance of the input sample of type complex or real of shape (nsam) or (ndim...
Definition: pm_sampleVar.F90:715

pm_sampleVar
This module contains classes and procedures for computing the properties related to the covariance ma...
Definition: pm_sampleVar.F90:394

Warning: This generic interface is merely a flexible wrapper around the generic subroutine interface setVar.
As such, all conditions and warnings associated with setVar equally hold for this generic interface.; The pure procedure(s) documented herein become impure when the ParaMonte library is compiled with preprocessor macro CHECK_ENABLED=1.
By default, these procedures are pure in release build and impure in debug and testing builds.

Note: Note the effects of bias-correction in computing the variance become noticeable only for very sample sample sizes (i.e., when nsam is small).; For a one-dimensional sample, one can also use the concise Fortran syntax to achieve the same goal as with the interface var = getVar(sample(:), mean, correction) with integer weight:

mean = sum(sample) / size(sample)

var = sum((sample-mean)**2) / (size(sample) - 1)

But the above concise version will be likely slightly slower as it potentially involves more loops.; For a two or higher-dimensional sample, if the variance is to be computed for the entire sample (as opposed to computing it along a particular dimension), simply pass reshape(sample, shape = size(sample)) to the appropriate getVar interface.
Alternatively, a 1D pointer of the same size as the multidimensional sample can be passed to the procedure.

See also: getMean
setMean
getShifted
setShifted
getVar
setVar

Example usage ⛓

: 1program example

2

3 use pm_kind, only: SK, IK, LK

4 use pm_kind, only: TKG => RKS ! All other real types are also supported.

5 use pm_io, only: display_type

6 use pm_sampleVar, only: getVar

7 use pm_arraySpace, only: getLinSpace

8 use pm_arrayShuffle, only: getShuffled

9 use pm_sampleCov, only: fweight, rweight

10 use pm_sampleShift, only: getShifted

11 use pm_arrayResize, only: setResized

12 use pm_distUnif, only: getUnifRand

13 use pm_sampleMean, only: getMean

14

15 implicit none

16

17 integer(IK) :: dim

18 type(display_type) :: disp

19 disp = display_type(file = "main.out.F90")

20

21 call disp%skip()

22 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

23 call disp%show("!Compute the variance of a 1-D array.")

24 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

25 call disp%skip()

26

27 block

28 real(TKG) :: var

29 real(TKG), allocatable :: sample(:)

30 call disp%show("sample = getLinSpace(1._TKG, 9._TKG, 5_IK)")

31 sample = getLinSpace(1._TKG, 9._TKG, 5_IK)

32 call disp%show("sample")

33 call disp%show( sample )

34 call disp%show("var = getVar(sample)")

35 var = getVar(sample)

36 call disp%show("var")

37 call disp%show( var )

38 call disp%show("var = getVar(sample, correction = fweight)")

39 var = getVar(sample, correction = fweight)

40 call disp%show("var")

41 call disp%show( var )

42 call disp%show("var = getVar(sample, correction = rweight)")

43 var = getVar(sample, correction = rweight)

44 call disp%show("var")

45 call disp%show( var )

46 call disp%show("var = getVar(sample, dim = 1_IK)")

47 var = getVar(sample, dim = 1_IK)

48 call disp%show("var")

49 call disp%show( var )

50 call disp%show("var = getVar(sample, dim = 1_IK, correction = fweight)")

51 var = getVar(sample, dim = 1_IK, correction = fweight)

52 call disp%show("var")

53 call disp%show( var )

54 call disp%show("var = getVar(sample, dim = 1_IK, correction = rweight)")

55 var = getVar(sample, dim = 1_IK, correction = rweight)

56 call disp%show("var")

57 call disp%show( var )

58 call disp%skip()

59 end block

60

61 block

62 real(TKG) :: var

63 complex(TKG) , allocatable :: sample(:)

64 call disp%show("sample = cmplx(getShuffled(getLinSpace(1., 9., 5_IK)), getShuffled(getLinSpace(1., 9., 5_IK)), TKG)")

65 sample = cmplx(getShuffled(getLinSpace(1., 9., 5_IK)), getShuffled(getLinSpace(1., 9., 5_IK)), TKG)

66 call disp%show("sample")

67 call disp%show( sample )

68 call disp%show("var = getVar(sample)")

69 var = getVar(sample)

70 call disp%show("var")

71 call disp%show( var )

72 call disp%show("var = getVar(sample, correction = fweight)")

73 var = getVar(sample, correction = fweight)

74 call disp%show("var")

75 call disp%show( var )

76 call disp%show("var = getVar(sample, correction = rweight)")

77 var = getVar(sample, correction = rweight)

78 call disp%show("var")

79 call disp%show( var )

80 call disp%show("var = getVar(sample, dim = 1_IK)")

81 var = getVar(sample, dim = 1_IK)

82 call disp%show("var")

83 call disp%show( var )

84 call disp%show("var = getVar(sample, dim = 1_IK, correction = fweight)")

85 var = getVar(sample, dim = 1_IK, correction = fweight)

86 call disp%show("var")

87 call disp%show( var )

88 call disp%show("var = getVar(sample, dim = 1_IK, correction = rweight)")

89 var = getVar(sample, dim = 1_IK, correction = rweight)

90 call disp%show("var")

91 call disp%show( var )

92 call disp%skip()

93 end block

94

95 call disp%skip()

96 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

97 call disp%show("!Compute the variance of a 2-D array.")

98 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

99 call disp%skip()

100

101 block

102 real(TKG), allocatable :: var(:), sample(:,:)

103 call disp%skip()

104 call disp%show("sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)")

105 sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

106 call disp%show("sample")

107 call disp%show( sample )

108 call disp%show("call setResized(var, 1_IK)")

109 call setResized(var, 1_IK)

110 call disp%show("var(1) = getVar(sample)")

111 var(1) = getVar(sample)

112 call disp%show("var(1)")

113 call disp%show( var(1) )

114 call disp%show("var(1) = getVar(sample, correction = fweight)")

115 var(1) = getVar(sample, correction = fweight)

116 call disp%show("var(1)")

117 call disp%show( var(1) )

118 call disp%show("var(1) = getVar(sample, correction = rweight)")

119 var(1) = getVar(sample, correction = rweight)

120 call disp%show("var(1)")

121 call disp%show( var(1) )

122 call disp%skip()

123 do dim = 1, 2

124 call disp%show("dim ! The observations axis.")

125 call disp%show( dim )

126 call disp%show("sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)")

127 sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

128 call disp%show("var = getVar(sample, dim, correction = fweight)")

129 var = getVar(sample, dim, correction = fweight)

130 call disp%show("var")

131 call disp%show( var )

132 call disp%show("var = getVar(sample, dim, correction = rweight)")

133 var = getVar(sample, dim, correction = rweight)

134 call disp%show("var")

135 call disp%show( var )

136 call disp%skip()

137 end do

138 end block

139

140 block

141 real(TKG), allocatable :: var(:)

142 complex(TKG), allocatable :: sample(:,:)

143 call disp%skip()

144 call disp%show("sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)")

145 sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)

146 call disp%show("sample")

147 call disp%show( sample )

148 call disp%show("call setResized(var, 1_IK)")

149 call setResized(var, 1_IK)

150 call disp%show("var(1) = getVar(sample)")

151 var(1) = getVar(sample)

152 call disp%show("var(1)")

153 call disp%show( var(1) )

154 call disp%show("var(1) = getVar(sample, correction = fweight)")

155 var(1) = getVar(sample, correction = fweight)

156 call disp%show("var(1)")

157 call disp%show( var(1) )

158 call disp%show("var(1) = getVar(sample, correction = rweight)")

159 var(1) = getVar(sample, correction = rweight)

160 call disp%show("var(1)")

161 call disp%show( var(1) )

162 call disp%skip()

163 do dim = 1, 2

164 call disp%show("dim ! The observations axis.")

165 call disp%show( dim )

166 call disp%show("sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)")

167 sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)

168 call disp%show("sample")

169 call disp%show( sample )

170 call disp%show("var = getVar(sample, dim)")

171 var = getVar(sample, dim)

172 call disp%show("var")

173 call disp%show( var )

174 call disp%show("var = getVar(sample, dim, correction = fweight)")

175 var = getVar(sample, dim, correction = fweight)

176 call disp%show("var")

177 call disp%show( var )

178 call disp%show("var = getVar(sample, dim, correction = rweight)")

179 var = getVar(sample, dim, correction = rweight)

180 call disp%show("var")

181 call disp%show( var )

182 call disp%skip()

183 end do

184 end block

185

186 call disp%skip()

187 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

188 call disp%show("!Compute the variance of a 1-D weighted array.")

189 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

190 call disp%skip()

191

192 block

193 real(TKG) :: var

194 real(TKG), allocatable :: sample(:)

195 real(TKG) , allocatable :: weight(:)

196 call disp%show("sample = getLinSpace(1._TKG, 9._TKG, 5_IK)")

197 sample = getLinSpace(1._TKG, 9._TKG, 5_IK)

198 call disp%show("sample")

199 call disp%show( sample )

200 call disp%show("weight = getLinSpace(1._TKG, 9._TKG, size(sample, 1, IK))")

201 weight = getLinSpace(1._TKG, 9._TKG, size(sample, 1, IK))

202 call disp%show("weight")

203 call disp%show( weight )

204 call disp%show("var = getVar(sample, weight = weight)")

205 var = getVar(sample, weight = weight)

206 call disp%show("var")

207 call disp%show( var )

208 call disp%show("var = getVar(sample, weight = weight, correction = fweight)")

209 var = getVar(sample, weight = weight, correction = fweight)

210 call disp%show("var")

211 call disp%show( var )

212 call disp%show("var = getVar(sample, weight = weight, correction = rweight)")

213 var = getVar(sample, weight = weight, correction = rweight)

214 call disp%show("var")

215 call disp%show( var )

216 call disp%show("var = getVar(sample, dim = 1_IK, weight = weight)")

217 var = getVar(sample, dim = 1_IK, weight = weight)

218 call disp%show("var")

219 call disp%show( var )

220 call disp%show("var = getVar(sample, dim = 1_IK, weight = weight, correction = fweight)")

221 var = getVar(sample, dim = 1_IK, weight = weight, correction = fweight)

222 call disp%show("var")

223 call disp%show( var )

224 call disp%show("var = getVar(sample, dim = 1_IK, weight = weight, correction = rweight)")

225 var = getVar(sample, dim = 1_IK, weight = weight, correction = rweight)

226 call disp%show("var")

227 call disp%show( var )

228 call disp%skip()

229 end block

230

231 call disp%skip()

232 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

233 call disp%show("!Compute the variance of a 2-D weighted array.")

234 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

235 call disp%skip()

236

237 block

238 real(TKG), allocatable :: var(:), sample(:,:)

239 real(TKG), allocatable :: weight(:)

240 call disp%skip()

241 call disp%show("sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)")

242 sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

243 call disp%show("sample")

244 call disp%show( sample )

245 call disp%show("weight = getLinSpace(1._TKG, 9._TKG, size(sample, kind = IK))")

246 weight = getLinSpace(1._TKG, 9._TKG, size(sample, kind = IK))

247 call disp%show("weight")

248 call disp%show( weight )

249 call disp%show("call setResized(var, 1_IK)")

250 call setResized(var, 1_IK)

251 call disp%show("var(1) = getVar(sample, weight = weight)")

252 var(1) = getVar(sample, weight = weight)

253 call disp%show("var(1)")

254 call disp%show( var(1) )

255 call disp%show("var(1) = getVar(sample, weight = weight, correction = fweight)")

256 var(1) = getVar(sample, weight = weight, correction = fweight)

257 call disp%show("var(1)")

258 call disp%show( var(1) )

259 call disp%show("var(1) = getVar(sample, weight = weight, correction = rweight)")

260 var(1) = getVar(sample, weight = weight, correction = rweight)

261 call disp%show("var(1)")

262 call disp%show( var(1) )

263 call disp%skip()

264 do dim = 1, 2

265 call disp%show("dim ! The observations axis.")

266 call disp%show( dim )

267 call disp%show("sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)")

268 sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

269 call disp%show("sample")

270 call disp%show( sample )

271 call disp%show("weight = getLinSpace(1._TKG, 9._TKG, size(sample, dim, IK))")

272 weight = getLinSpace(1._TKG, 9._TKG, size(sample, dim, IK))

273 call disp%show("weight")

274 call disp%show( weight )

275 call disp%show("var = getVar(sample, dim, weight = weight)")

276 var = getVar(sample, dim, weight = weight)

277 call disp%show("var")

278 call disp%show( var )

279 call disp%show("var = getVar(sample, dim, weight = weight, correction = fweight)")

280 var = getVar(sample, dim, weight = weight, correction = fweight)

281 call disp%show("var")

282 call disp%show( var )

283 call disp%show("var = getVar(sample, dim, weight = weight, correction = rweight)")

284 var = getVar(sample, dim, weight = weight, correction = rweight)

285 call disp%show("var")

286 call disp%show( var )

287 call disp%skip()

288 end do

289 end block

290

291 call disp%skip()

292 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

293 call disp%show("!Compute the variance of a multidimensional array by reshaping the array.")

294 call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")

295 call disp%skip()

296

297 block

298 real(TKG), allocatable :: var

299 real(TKG), allocatable, target :: sample(:,:,:)

300 real(TKG), pointer :: samptr(:)

301 call disp%show("sample = getUnifRand(0., 1., 3_IK, 3_IK, 3_IK)")

302 sample = getUnifRand(0., 1., 3_IK, 3_IK, 3_IK)

303 call disp%show("sample")

304 call disp%show( sample )

305 call disp%show("samptr(1:product(shape(sample))) => sample")

306 samptr(1:product(shape(sample))) => sample

307 call disp%show("var = getVar(samptr)")

308 var = getVar(samptr)

309 call disp%show("var")

310 call disp%show( var )

311 call disp%show("nullify(samptr)")

312 nullify(samptr)

313 call disp%skip()

314 end block

315

316end program example

pm_arrayResize::setResized
Allocate or resize (shrink or expand) an input allocatable scalar string or array of rank 1....
Definition: pm_arrayResize.F90:249

pm_arrayShuffle::getShuffled
Perform an unbiased random shuffling of the input array, known as the Knuth or Fisher-Yates shuffle,...
Definition: pm_arrayShuffle.F90:145

pm_arraySpace::getLinSpace
Generate count evenly spaced points over the interval [x1, x2] if x1 < x2, or [x2,...
Definition: pm_arraySpace.F90:108

pm_distUnif::getUnifRand
Generate and return a scalar or a contiguous array of rank 1 of length s1 of randomly uniformly distr...
Definition: pm_distUnif.F90:4150

pm_io::show
This is a generic method of the derived type display_type with pass attribute.
Definition: pm_io.F90:11726

pm_io::skip
This is a generic method of the derived type display_type with pass attribute.
Definition: pm_io.F90:11508

pm_sampleMean::getMean
Generate and return the (weighted) mean of an input sample of nsam observations with ndim = 1 or 2 at...
Definition: pm_sampleMean.F90:229

pm_sampleShift::getShifted
Generate a sample of shape (nsam), or (ndim, nsam) or (nsam, ndim) that is shifted by the specified i...
Definition: pm_sampleShift.F90:197

pm_arrayResize
This module contains procedures and generic interfaces for resizing allocatable arrays of various typ...
Definition: pm_arrayResize.F90:81

pm_arrayShuffle
This module contains procedures and generic interfaces for shuffling arrays of various types.
Definition: pm_arrayShuffle.F90:56

pm_arraySpace
This module contains procedures and generic interfaces for generating arrays with linear or logarithm...
Definition: pm_arraySpace.F90:33

pm_distUnif
This module contains classes and procedures for computing various statistical quantities related to t...
Definition: pm_distUnif.F90:274

pm_io
This module contains classes and procedures for input/output (IO) or generic display operations on st...
Definition: pm_io.F90:252

pm_io::disp
type(display_type) disp
This is a scalar module variable an object of type display_type for general display.
Definition: pm_io.F90:11393

pm_kind
This module defines the relevant Fortran kind type-parameters frequently used in the ParaMonte librar...
Definition: pm_kind.F90:268

pm_kind::LK
integer, parameter LK
The default logical kind in the ParaMonte library: kind(.true.) in Fortran, kind(....
Definition: pm_kind.F90:541

pm_kind::IK
integer, parameter IK
The default integer kind in the ParaMonte library: int32 in Fortran, c_int32_t in C-Fortran Interoper...
Definition: pm_kind.F90:540

pm_kind::SK
integer, parameter SK
The default character kind in the ParaMonte library: kind("a") in Fortran, c_char in C-Fortran Intero...
Definition: pm_kind.F90:539

pm_kind::RKS
integer, parameter RKS
The single-precision real kind in Fortran mode. On most platforms, this is an 32-bit real kind.
Definition: pm_kind.F90:567

pm_sampleCov
This module contains classes and procedures for computing the properties related to the covariance ma...
Definition: pm_sampleCov.F90:170

pm_sampleMean
This module contains classes and procedures for computing the first moment (i.e., the statistical mea...
Definition: pm_sampleMean.F90:104

pm_sampleShift
This module contains classes and procedures for shifting univariate or multivariate samples by arbitr...
Definition: pm_sampleShift.F90:59

pm_io::display_type
Generate and return an object of type display_type.
Definition: pm_io.F90:10282

Example Unix compile command via Intel ifort compiler ⛓
1#!/usr/bin/env sh

2rm main.exe

3ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe

4./main.exe

Example Windows Batch compile command via Intel ifort compiler ⛓
1del main.exe

2set PATH=..\..\..\lib;%PATH%

3ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe

4main.exe

Example Unix / MinGW compile command via GNU gfortran compiler ⛓
1#!/usr/bin/env sh

2rm main.exe

3gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe

4./main.exe

Example output ⛓
1

2!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

3!Compute the variance of a 1-D array.

4!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

5

6sample = getLinSpace(1._TKG, 9._TKG, 5_IK)

7sample

8+1.00000000, +3.00000000, +5.00000000, +7.00000000, +9.00000000

9var = getVar(sample)

10var

11+8.00000000

12var = getVar(sample, correction = fweight)

13var

14+10.0000000

15var = getVar(sample, correction = rweight)

16var

17+10.0000000

18var = getVar(sample, dim = 1_IK)

19var

20+8.00000000

21var = getVar(sample, dim = 1_IK, correction = fweight)

22var

23+10.0000000

24var = getVar(sample, dim = 1_IK, correction = rweight)

25var

26+10.0000000

27

28sample = cmplx(getShuffled(getLinSpace(1., 9., 5_IK)), getShuffled(getLinSpace(1., 9., 5_IK)), TKG)

29sample

30(+3.00000000, +5.00000000), (+9.00000000, +1.00000000), (+7.00000000, +3.00000000), (+1.00000000, +7.00000000), (+5.00000000, +9.00000000)

31var = getVar(sample)

32var

33+16.0000000

34var = getVar(sample, correction = fweight)

35var

36+20.0000000

37var = getVar(sample, correction = rweight)

38var

39+20.0000000

40var = getVar(sample, dim = 1_IK)

41var

42+16.0000000

43var = getVar(sample, dim = 1_IK, correction = fweight)

44var

45+20.0000000

46var = getVar(sample, dim = 1_IK, correction = rweight)

47var

48+20.0000000

49

50

51!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

52!Compute the variance of a 2-D array.

53!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

54

55

56sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

57sample

58+4.12921572, +3.23392248, +8.71532631, +3.57250690, +2.84240818

59+4.19472408, +6.35930729, +2.11785364, +7.29621410, +5.26567125

60+4.05614471, +5.43257189, +3.42744541, +7.79892588, +6.00786209

61+7.65003061, +4.55825949, +1.56357431, +6.27047348, +4.27746677

62call setResized(var, 1_IK)

63var(1) = getVar(sample)

64var(1)

65+3.70040131

66var(1) = getVar(sample, correction = fweight)

67var(1)

68+3.89515948

69var(1) = getVar(sample, correction = rweight)

70var(1)

71+3.89515948

72

73dim ! The observations axis.

74+1

75sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

76var = getVar(sample, dim, correction = fweight)

77var

78+2.82083201, +1.53922629, +1.86118722, +5.26235390, +1.55820251

79var = getVar(sample, dim, correction = rweight)

80var

81+2.82083201, +1.53922629, +1.86118722, +5.26235390, +1.55820251

82

83dim ! The observations axis.

84+2

85sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

86var = getVar(sample, dim, correction = fweight)

87var

88+6.67883015, +2.03104091, +6.25487471, +3.24131751

89var = getVar(sample, dim, correction = rweight)

90var

91+6.67883015, +2.03104091, +6.25487471, +3.24131751

92

93

94sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)

95sample

96(-8.00000000, +0.00000000), (-2.00000000, -1.00000000), (+5.00000000, -1.00000000), (-9.00000000, +3.00000000), (+5.00000000, -8.00000000)

97(-6.00000000, -4.00000000), (-8.00000000, -9.00000000), (+6.00000000, -1.00000000), (+6.00000000, -4.00000000), (-4.00000000, +9.00000000)

98(+8.00000000, +7.00000000), (-6.00000000, +0.00000000), (+0.00000000, -5.00000000), (-1.00000000, +7.00000000), (-8.00000000, +2.00000000)

99(+5.00000000, -1.00000000), (-1.00000000, +9.00000000), (-6.00000000, -9.00000000), (-8.00000000, -2.00000000), (-3.00000000, -9.00000000)

100call setResized(var, 1_IK)

101var(1) = getVar(sample)

102var(1)

103+62.8149948

104var(1) = getVar(sample, correction = fweight)

105var(1)

106+66.1210480

107var(1) = getVar(sample, correction = rweight)

108var(1)

109+66.1210480

110

111dim ! The observations axis.

112+1

113sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)

114sample

115(+9.00000000, -2.00000000), (+0.00000000, +1.00000000), (+0.00000000, -1.00000000), (-1.00000000, -2.00000000), (-4.00000000, -7.00000000)

116(+9.00000000, -6.00000000), (+7.00000000, -1.00000000), (+8.00000000, -7.00000000), (-1.00000000, +9.00000000), (-8.00000000, +6.00000000)

117(+8.00000000, +1.00000000), (+0.00000000, +4.00000000), (+2.00000000, -2.00000000), (+5.00000000, +2.00000000), (-9.00000000, +4.00000000)

118(-2.00000000, -3.00000000), (+3.00000000, +2.00000000), (+7.00000000, -4.00000000), (-4.00000000, +5.00000000), (+8.00000000, +1.00000000)

119var = getVar(sample, dim)

120var

121+27.7500000, +11.5000000, +16.4375000, +26.9375000, +70.1875000

122var = getVar(sample, dim, correction = fweight)

123var

124+29.2105274, +12.1052637, +17.3026314, +28.3552647, +73.8815842

125var = getVar(sample, dim, correction = rweight)

126var

127+29.2105274, +12.1052637, +17.3026314, +28.3552647, +73.8815842

128

129dim ! The observations axis.

130+2

131sample = cmplx(getUnifRand(-9, 9, 4_IK, 5_IK), -getUnifRand(-9, 9, 4_IK, 5_IK), TKG)

132sample

133(+6.00000000, +8.00000000), (-7.00000000, -6.00000000), (-3.00000000, +8.00000000), (-1.00000000, +4.00000000), (-6.00000000, -7.00000000)

134(-5.00000000, -1.00000000), (+8.00000000, +1.00000000), (+4.00000000, -8.00000000), (-7.00000000, +9.00000000), (+3.00000000, +1.00000000)

135(+0.00000000, -7.00000000), (+7.00000000, -2.00000000), (-9.00000000, +7.00000000), (-8.00000000, +9.00000000), (-7.00000000, -3.00000000)

136(-2.00000000, +4.00000000), (+3.00000000, +3.00000000), (+3.00000000, +0.00000000), (+4.00000000, -6.00000000), (-3.00000000, -5.00000000)

137var = getVar(sample, dim)

138var

139+65.2000046, +61.6800003, +74.7999954, +24.9599991

140var = getVar(sample, dim, correction = fweight)

141var

142+68.6315842, +64.9263153, +78.7368393, +26.2736835

143var = getVar(sample, dim, correction = rweight)

144var

145+68.6315842, +64.9263153, +78.7368393, +26.2736835

146

147

148!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

149!Compute the variance of a 1-D weighted array.

150!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

151

152sample = getLinSpace(1._TKG, 9._TKG, 5_IK)

153sample

154+1.00000000, +3.00000000, +5.00000000, +7.00000000, +9.00000000

155weight = getLinSpace(1._TKG, 9._TKG, size(sample, 1, IK))

156weight

157+1.00000000, +3.00000000, +5.00000000, +7.00000000, +9.00000000

158var = getVar(sample, weight = weight)

159var

160+5.44000006

161var = getVar(sample, weight = weight, correction = fweight)

162var

163+5.66666651

164var = getVar(sample, weight = weight, correction = rweight)

165var

166+7.39130449

167var = getVar(sample, dim = 1_IK, weight = weight)

168var

169+5.44000006

170var = getVar(sample, dim = 1_IK, weight = weight, correction = fweight)

171var

172+5.66666651

173var = getVar(sample, dim = 1_IK, weight = weight, correction = rweight)

174var

175+7.39130449

176

177

178!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

179!Compute the variance of a 2-D weighted array.

180!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

181

182

183sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

184sample

185+5.29397678, +8.18918991, +5.16748524, +1.78410721, +6.57217121

186+4.60676575, +4.71704817, +7.21647358, +1.79534006, +3.11167288

187+2.63811302, +6.37841988, +1.21801853, +7.49396276, +3.56025982

188+7.52323580, +1.41013336, +5.17097330, +5.33743143, +3.31437349

189weight = getLinSpace(1._TKG, 9._TKG, size(sample, kind = IK))

190weight

191+1.00000000, +1.42105269, +1.84210527, +2.26315784, +2.68421054, +3.10526323, +3.52631569, +3.94736838, +4.36842108, +4.78947353, +5.21052647, +5.63157892, +6.05263138, +6.47368431, +6.89473677, +7.31578970, +7.73684216, +8.15789413, +8.57894707, +9.00000000

192call setResized(var, 1_IK)

193var(1) = getVar(sample, weight = weight)

194var(1)

195+4.37727976

196var(1) = getVar(sample, weight = weight, correction = fweight)

197var(1)

198+4.42149448

199var(1) = getVar(sample, weight = weight, correction = rweight)

200var(1)

201+4.66556215

202

203dim ! The observations axis.

204+1

205sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

206sample

207+4.13911772, +7.03946257, +6.58551216, +7.89993811, +1.55608797

208+5.14891863, +6.02331781, +6.29733372, +3.76061153, +5.93542957

209+5.75712729, +8.68555546, +8.83969498, +2.90211916, +3.90573359

210+1.15081072, +8.26825047, +1.65203571, +3.76794291, +2.01402998

211weight = getLinSpace(1._TKG, 9._TKG, size(sample, dim, IK))

212weight

213+1.00000000, +3.66666675, +6.33333349, +9.00000000

214var = getVar(sample, dim, weight = weight)

215var

216+4.61553717, +0.938402474, +10.1462450, +1.08631825, +2.28568125

217var = getVar(sample, dim, weight = weight, correction = fweight)

218var

219+4.85846043, +0.987792134, +10.6802588, +1.14349294, +2.40598035

220var = getVar(sample, dim, weight = weight, correction = rweight)

221var

222+6.98148441, +1.41943228, +15.3472605, +1.64317036, +3.45733285

223

224dim ! The observations axis.

225+2

226sample = getUnifRand(1._TKG, 9._TKG, 4_IK, 5_IK)

227sample

228+5.18609095, +8.10227489, +6.44532299, +7.53516436, +7.00741339

229+5.34240055, +7.22200584, +4.45973253, +4.11605692, +6.00306177

230+5.69385910, +2.93198252, +4.05808020, +3.92866802, +2.51374769

231+2.02472973, +7.68335056, +8.90037918, +8.49943066, +7.49475288

232weight = getLinSpace(1._TKG, 9._TKG, size(sample, dim, IK))

233weight

234+1.00000000, +3.00000000, +5.00000000, +7.00000000, +9.00000000

235var = getVar(sample, dim, weight = weight)

236var

237+0.408896327, +1.15480363, +0.684372485, +1.74474633

238var = getVar(sample, dim, weight = weight, correction = fweight)

239var

240+0.425933659, +1.20292044, +0.712888002, +1.81744397

241var = getVar(sample, dim, weight = weight, correction = rweight)

242var

243+0.555565655, +1.56902659, +0.929853916, +2.37057924

244

245

246!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

247!Compute the variance of a multidimensional array by reshaping the array.

248!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

249

250sample = getUnifRand(0., 1., 3_IK, 3_IK, 3_IK)

251sample

252slice(:,:,1) =

253+0.617693782, +0.712800622, +0.181455374

254+0.776526690, +0.269264579, +0.435956359

255+0.718100905, +0.579773188E-1, +0.238781571

256slice(:,:,2) =

257+0.118698955, +0.217659235, +0.782679617

258+0.395786285, +0.500491679, +0.579881847

259+0.114023924, +0.361837864, +0.494825244E-1

260slice(:,:,3) =

261+0.939588785, +0.498580039, +0.832240283

262+0.485584497, +0.497074604, +0.565555096E-1

263+0.709281743, +0.924800754, +0.784395993

264samptr(1:product(shape(sample))) => sample

265var = getVar(samptr)

266var

267+0.773779824E-1

268nullify(samptr)

269

270

Test:: test_pm_sampleVar

Todo:: Very Low Priority: The functionality of this interface can be expanded in the future to include the computation of the variance of higher dimensional input sample and whole sample input arrays of arbitrary shape.

Final Remarks ⛓

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For details on the naming conventions, see this page.
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Copyright: Computational Data Science Lab

Author:: Fatemeh Bagheri, Monday 02:15 AM, September 27, 2021, Dallas, TX

Definition at line 715 of file pm_sampleVar.F90.

The documentation for this interface was generated from the following file:

src/fortran/main/pm_sampleVar.F90