Generate and return a scalar (or array of arbitrary rank) of the natural logarithm(s) of random value(s) from the (Truncated) Power distribution with parameters \((\alpha, x_\mathrm{min}, x_\mathrm{max})\).
More...
Generate and return a scalar (or array of arbitrary rank) of the natural logarithm(s) of random value(s) from the (Truncated) Power distribution with parameters \((\alpha, x_\mathrm{min}, x_\mathrm{max})\).
See the documentation of pm_distPower for more information on the (Truncated) Power distribution.
- Parameters
-
[in] | alpha | : The input scalar (or array of the same rank, shape, and size as other array like arguments), of
-
type
real of kind any supported by the processor (e.g., RK, RK32, RK64, or RK128),
containing the shape parameter ( \(\alpha\)) of the distribution.
|
[in] | logMinX | : The input scalar (or array of the same rank, shape, and size as other array like arguments), of the same type and kind as alpha , containing the natural logarithm of the first scale parameter of the distribution, representing the minimum of the support of the distribution.
(optional, default = 0 . It can be present if and only if logMaxX is also present.) |
[in] | logMaxX | : The input scalar (or array of the same rank, shape, and size as other array like arguments), of the same type and kind as alpha , containing the natural logarithm of the second scale parameter of the distribution, representing the maximum of the support of the distribution.
|
- Returns
logRand
: The output scalar (or array of the same rank, shape, and size as other array like arguments), of the same type and kind as alpha
, containing the random value(s) from the specified distribution.
Possible calling interfaces ⛓
!
Generate and return a scalar (or array of arbitrary rank) of the natural logarithm(s) of random value...
This module contains classes and procedures for computing various statistical quantities related to t...
- Warning
- The condition
alpha > 0
must hold for the corresponding input arguments.
The conditions logMinX < logMaxX
must hold for the corresponding input arguments.
These conditions are verified only if the library is built with the preprocessor macro CHECK_ENABLED=1
.
- See also
- setPowerLogRand
Example usage ⛓
11 type(display_type) :: disp
15 call disp%show(
"!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
16 call disp%show(
"! Compute random value(s) from the Power distribution.")
17 call disp%show(
"!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
21 call disp%show(
"logx(1) = getPowerLogRand(alpha = +2., logMaxX = -2.) ! Power distribution.")
28 call disp%show(
"logx(1:3) = getPowerLogRand(alpha = +[+2., +3., +4.], logMaxX = -2.) ! Power distribution.")
35 call disp%show(
"!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
36 call disp%show(
"! Compute random value(s) from the Truncated Power distribution.")
37 call disp%show(
"!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
41 call disp%show(
"logx(1) = getPowerLogRand(alpha = +1., logMinX = -2., logMaxX = 5.) ! Truncated Power distribution.")
48 call disp%show(
"logx(1:3) = getPowerLogRand(alpha = +[+1., +2., +3.], logMinX = -2., logMaxX = 5.) ! Truncated Power distribution.")
49 logx(
1:
3)
= getPowerLogRand(alpha
= +[
+1.,
+2.,
+3.], logMinX
= -2., logMaxX
= 5.)
60 real :: alpha(
3), logMinX(
3), logMaxX(
3), logx(
3)
61 integer(IK) :: fileUnit, i
63 logMinX
= log([
3.,
tiny(
0.),
tiny(
0.)])
64 logMaxX
= log([
10.,
5.,
8.])
65 open(newunit
= fileUnit, file
= "getPowerLogRand.RK.txt")
69 write(fileUnit,
"(*(g0,:,', '))")
exp(logx)
Return the linSpace output argument with size(linSpace) elements of evenly-spaced values over the int...
This is a generic method of the derived type display_type with pass attribute.
This is a generic method of the derived type display_type with pass attribute.
This module contains procedures and generic interfaces for generating arrays with linear or logarithm...
This module contains classes and procedures for input/output (IO) or generic display operations on st...
type(display_type) disp
This is a scalar module variable an object of type display_type for general display.
This module defines the relevant Fortran kind type-parameters frequently used in the ParaMonte librar...
integer, parameter LK
The default logical kind in the ParaMonte library: kind(.true.) in Fortran, kind(....
integer, parameter IK
The default integer kind in the ParaMonte library: int32 in Fortran, c_int32_t in C-Fortran Interoper...
integer, parameter SK
The default character kind in the ParaMonte library: kind("a") in Fortran, c_char in C-Fortran Intero...
Generate and return an object of type display_type.
Example Unix compile command via Intel ifort
compiler ⛓
3ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
Example Windows Batch compile command via Intel ifort
compiler ⛓
2set PATH=..\..\..\lib;%PATH%
3ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe
Example Unix / MinGW compile command via GNU gfortran
compiler ⛓
3gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
Example output ⛓
14-3.01672459,
-2.13304520,
-2.24295020
27logx(
1:
3)
= getPowerLogRand(alpha
= +[
+1.,
+2.,
+3.], logMinX
= -2., logMaxX
= 5.)
29+3.70737314,
+4.70640230,
+4.96277094
Postprocessing of the example output ⛓
3import matplotlib.pyplot
as plt
16xlab = {
"CK" :
"Random Value ( Real / Imaginary ))"
17 ,
"IK" :
"Random Value ( Integer )"
18 ,
"RK" :
"Random Value ( Real )"
20legends = [
r"$\alpha = +.1, x_{min} = +3., x_{max} = +10$"
21 ,
r"$\alpha = +2., x_{min} = +0., x_{max} = +5$"
22 ,
r"$\alpha = +.5, x_{min} = +0., x_{max} = +8$"
25for kind
in [
"IK",
"CK",
"RK"]:
27 pattern =
"*." + kind +
".txt"
28 fileList = glob.glob(pattern)
29 if len(fileList) == 1:
31 df = pd.read_csv(fileList[0], delimiter =
", ")
33 fig = plt.figure(figsize = 1.25 * np.array([6.4, 4.8]), dpi = 200)
37 ax.hist ( df.values[:, 0]
39 , histtype =
"stepfilled"
43 ax.hist ( df.values[:, 1]
45 , histtype =
"stepfilled"
50 ax.hist ( df.values[:,:]
52 , histtype =
"stepfilled"
56 ax.legend ( legends[::-1]
60 plt.xticks(fontsize = fontsize - 2)
61 plt.yticks(fontsize = fontsize - 2)
62 ax.set_xlabel(xlab[kind], fontsize = 17)
63 ax.set_ylabel(
"Density", fontsize = 17)
64 ax.set_title(
"Histogram of {} randomly generated values".format(len(df.values)), fontsize = fontsize)
68 plt.grid(visible =
True, which =
"both", axis =
"both", color =
"0.85", linestyle =
"-")
69 ax.tick_params(axis =
"y", which =
"minor")
70 ax.tick_params(axis =
"x", which =
"minor")
71 ax.set_axisbelow(
True)
74 plt.savefig(fileList[0].replace(
".txt",
".png"))
76 elif len(fileList) > 1:
78 sys.exit(
"Ambiguous file list exists.")
Visualization of the example output ⛓
- Test:
- test_pm_distPower
- Todo:
- Very Low Priority: This generic interface can be extended to
complex
arguments.
Final Remarks ⛓
If you believe this algorithm or its documentation can be improved, we appreciate your contribution and help to edit this page's documentation and source file on GitHub.
For details on the naming abbreviations, see this page.
For details on the naming conventions, see this page.
This software is distributed under the MIT license with additional terms outlined below.
-
If you use any parts or concepts from this library to any extent, please acknowledge the usage by citing the relevant publications of the ParaMonte library.
-
If you regenerate any parts/ideas from this library in a programming environment other than those currently supported by this ParaMonte library (i.e., other than C, C++, Fortran, MATLAB, Python, R), please also ask the end users to cite this original ParaMonte library.
This software is available to the public under a highly permissive license.
Help us justify its continued development and maintenance by acknowledging its benefit to society, distributing it, and contributing to it.
- Copyright
- Computational Data Science Lab
- Author:
- Amir Shahmoradi, Oct 16, 2009, 11:14 AM, Michigan
Definition at line 1725 of file pm_distPower.F90.