pm_distPower::setPowerLogPDF Interface Reference

Return the natural logarithm of the Probability Density Function (PDF) of the (Truncated) Power distribution for an input log(x) within the support of the distribution \(x \in [0 < x_\mathrm{min}, x_\mathrm{max} < +\infty]\). More...

Detailed Description

Return the natural logarithm of the Probability Density Function (PDF) of the (Truncated) Power distribution for an input log(x) within the support of the distribution \(x \in [0 < x_\mathrm{min}, x_\mathrm{max} < +\infty]\).

See the documentation of pm_distPower for more information on the (Truncated) Power distribution.

Parameters

[out]	logPDF	: The output scalar or array of the same shape as any input array-like argument, of the same type and kind the input argument x, containing the natural logarithm of the PDF of the distribution.
[in]	logx	: The input scalar or array of the same shape as other array like arguments, of type real of kind any supported by the processor (e.g., RK, RK32, RK64, or RK128), containing the natural logarithm of the value at which the PDF must be computed.
[in]	alpha	: The input scalar or array of the same shape as other array-like arguments, of the same type and kind as logx, containing the shape parameter of the distribution.
[in]	logPDFNF	: The input scalar or array of the same shape as other array-like arguments, of the same type and kind as logx, containing the natural logarithm of the normalization factor of the PDF of the (Truncated) Power distribution. Specifying this argument when calling this procedure repeatedly with fixed \((\alpha, x_\mathrm{min}, x_\mathrm{max})\) parameters will significantly improve the runtime performance. This argument can be readily obtained by calling getPowerLogPDFNF(alpha, logMinX, logMaxX).

Possible calling interfaces ⛓

use pm_distPower, only: setPowerLogPDF
 
call setPowerLogPDF(logPDF, logx, alpha, logPDFNF)

Warning

The condition 0 < alpha must hold for the corresponding input arguments.
These conditions are verified only if the library is built with the preprocessor macro CHECK_ENABLED=1.

Be warned that the procedures under this generic interface have no mechanism for checking for the consistency of the specified input arguments with each other.

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.

Remarks

The procedures under discussion are elemental.

See also

setPowerLogPDF

Example usage ⛓

program example
 
    use pm_kind, only: SK, IK, LK
    use pm_distPower, only: getPowerLogPDFNF
    use pm_distPower, only: setPowerLogPDF
    use pm_io, only: display_type
 
    implicit none
 
    real                    :: logPDF(3)
 
    type(display_type)      :: disp
    disp = display_type(file = "main.out.F90")
 
    call disp%skip()
    call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
    call disp%show("! Compute the Probability Density Function (PDF) of the Power distribution.")
    call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
    call disp%skip()
 
    call disp%skip()
    call disp%show("call setPowerLogPDF(logPDF(1), logx = 3., alpha = +2., logPDFNF = getPowerLogPDFNF(alpha = +2., logMaxX = 5.)) ! Power distribution.")
                    call setPowerLogPDF(logPDF(1), logx = 3., alpha = +2., logPDFNF = getPowerLogPDFNF(alpha = +2., logMaxX = 5.)) ! Power distribution.
    call disp%show("logPDF(1)")
    call disp%show( logPDF(1) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("call setPowerLogPDF(logPDF(1:3), logx = [3., 4., 5.], alpha = [+2., +3., +4.], logPDFNF = getPowerLogPDFNF(alpha = [+2., +3., +4.], logMaxX = 5.)) ! Power distribution.")
                    call setPowerLogPDF(logPDF(1:3), logx = [3., 4., 5.], alpha = [+2., +3., +4.], logPDFNF = getPowerLogPDFNF(alpha = [+2., +3., +4.], logMaxX = 5.)) ! Power distribution.
    call disp%show("logPDF(1:3)")
    call disp%show( logPDF(1:3) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
    call disp%show("! Compute the Probability Density Function (PDF) of the Truncated Power distribution.")
    call disp%show("!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%")
    call disp%skip()
 
    call disp%skip()
    call disp%show("call setPowerLogPDF(logPDF(1), logx = 3., alpha = +2., logPDFNF = getPowerLogPDFNF(alpha = +2., logMinX = -2., logMaxX = 5.)) ! Truncated Power distribution.")
                    call setPowerLogPDF(logPDF(1), logx = 3., alpha = +2., logPDFNF = getPowerLogPDFNF(alpha = +2., logMinX = -2., logMaxX = 5.)) ! Truncated Power distribution.
    call disp%show("logPDF(1)")
    call disp%show( logPDF(1) )
    call disp%skip()
 
    call disp%skip()
    call disp%show("call setPowerLogPDF(logPDF(1:3), logx = [3., 4., 5.], alpha = [+2., +3., +4.], logPDFNF = getPowerLogPDFNF(alpha = [+2., +3., +4.], logMinX = -2., logMaxX = 5.)) ! Truncated Power distribution.")
                    call setPowerLogPDF(logPDF(1:3), logx = [3., 4., 5.], alpha = [+2., +3., +4.], logPDFNF = getPowerLogPDFNF(alpha = [+2., +3., +4.], logMinX = -2., logMaxX = 5.)) ! Truncated Power distribution.
    call disp%show("logPDF(1:3)")
    call disp%show( logPDF(1:3) )
    call disp%skip()
 
    !%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    ! Output an example logPDF array for visualization.
    !%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
    block
        use pm_arraySpace, only: setLinSpace
        real :: alpha(2), logMinX, logMaxX, logPDF(4), logx(2000)
        integer(IK) :: fileUnit, i
        call setLinSpace(logx, x1 = log(0.1), x2 = log(10.))
        alpha = [+0.5, +2.0]
        logMinX = log(3.)
        logMaxX = log(8.)
        open(newunit = fileUnit, file = "setPowerLogPDF.RK.txt")
        do i = 1, size(logx, 1, IK)
            logPDF = -huge(0.)
            if (logx(i) <= logMaxX) then
                call setPowerLogPDF(logPDF(1:2), logx(i), alpha, getPowerLogPDFNF(alpha, logMaxX))
                if (logMinX <= logx(i)) call setPowerLogPDF(logPDF(3:4), logx(i), alpha, getPowerLogPDFNF(alpha, logMinX, logMaxX))
            end if
            write(fileUnit, "(*(g0,:,', '))") exp(logx(i)), exp(logPDF)
        end do
        close(fileUnit)
    end block
 
end program example

Example Unix compile command via Intel ifort compiler ⛓

#!/usr/bin/env sh
rm main.exe
ifort -fpp -standard-semantics -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
./main.exe

Example Windows Batch compile command via Intel ifort compiler ⛓

del main.exe
set PATH=..\..\..\lib;%PATH%
ifort /fpp /standard-semantics /O3 /I:..\..\..\include main.F90 ..\..\..\lib\libparamonte*.lib /exe:main.exe
main.exe

Example Unix / MinGW compile command via GNU gfortran compiler ⛓

#!/usr/bin/env sh
rm main.exe
gfortran -cpp -ffree-line-length-none -O3 -Wl,-rpath,../../../lib -I../../../inc main.F90 ../../../lib/libparamonte* -o main.exe
./main.exe

Example output ⛓

 
!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
! Compute the Probability Density Function (PDF) of the Power distribution.
!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 
call setPowerLogPDF(logPDF(1), logx = 3., alpha = +2., logPDFNF = getPowerLogPDFNF(alpha = +2., logMaxX = 5.)) ! Power distribution.
logPDF(1)
-6.30685234
 
 
call setPowerLogPDF(logPDF(1:3), logx = [3., 4., 5.], alpha = [+2., +3., +4.], logPDFNF = getPowerLogPDFNF(alpha = [+2., +3., +4.], logMaxX = 5.)) ! Power distribution.
logPDF(1:3)
-6.30685234, -5.90138817, -3.61370468
 
 
!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
! Compute the Probability Density Function (PDF) of the Truncated Power distribution.
!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 
call setPowerLogPDF(logPDF(1), logx = 3., alpha = +2., logPDFNF = getPowerLogPDFNF(alpha = +2., logMinX = -2., logMaxX = 5.)) ! Truncated Power distribution.
logPDF(1)
-6.30685234
 
 
call setPowerLogPDF(logPDF(1:3), logx = [3., 4., 5.], alpha = [+2., +3., +4.], logPDFNF = getPowerLogPDFNF(alpha = [+2., +3., +4.], logMinX = -2., logMaxX = 5.)) ! Truncated Power distribution.
logPDF(1:3)
-6.30685234, -5.90138817, -3.61370468
 
 

Postprocessing of the example output ⛓

#!/usr/bin/env python
 
import matplotlib.pyplot as plt
import pandas as pd
import numpy as np
import glob
import sys
 
linewidth = 2
fontsize = 17
 
marker ={ "CK" : "-"
        , "IK" : "."
        , "RK" : "-"
        }
xlab =  { "CK" : "X ( real/imaginary components )"
        , "IK" : "X ( integer-valued )"
        , "RK" : "X ( real-valued )"
        }
legends =   [ r"$\alpha = .5, x_{min} = +0., x_{max} = +8$"
            , r"$\alpha = 2., x_{min} = +0., x_{max} = +8$"
            , r"$\alpha = .5, x_{min} = +3., x_{max} = +8$"
            , r"$\alpha = 2., x_{min} = +3., x_{max} = +8$"
            ]
 
for kind in ["IK", "CK", "RK"]:
 
    pattern = "*." + kind + ".txt"
    fileList = glob.glob(pattern)
    if len(fileList) == 1:
 
        df = pd.read_csv(fileList[0], delimiter = ", ")
 
        fig = plt.figure(figsize = 1.25 * np.array([6.4, 4.8]), dpi = 200)
        ax = plt.subplot()
 
        if kind == "CK":
            plt.plot( df.values[:, 0]
                    , df.values[:,1:5]
                    , marker[kind]
                    , linewidth = linewidth
                   #, color = "r"
                    )
            plt.plot( df.values[:,1]
                    , df.values[:,1:5]
                    , marker[kind]
                    , linewidth = linewidth
                   #, color = "blue"
                    )
        else:
            plt.plot( df.values[:, 0]
                    , df.values[:,1:5]
                    , marker[kind]
                    , linewidth = linewidth
                   #, color = "r"
                    )
            ax.legend   ( legends
                        , fontsize = fontsize - 5
                        )
 
        plt.xticks(fontsize = fontsize - 2)
        plt.yticks(fontsize = fontsize - 2)
        ax.set_xlabel(xlab[kind], fontsize = 17)
        ax.set_ylabel("Probability Density Function (PDF)", fontsize = 17)
        #ax.set_xscale("log")
        #ax.set_yscale("log")
 
        plt.grid(visible = True, which = "both", axis = "both", color = "0.85", linestyle = "-")
        ax.tick_params(axis = "y", which = "minor")
        ax.tick_params(axis = "x", which = "minor")
 
        plt.tight_layout()
        plt.savefig(fileList[0].replace(".txt",".png"))
 
    elif len(fileList) > 1:
 
        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 ⛓

---

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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.

1. 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.
   
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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 639 of file pm_distPower.F90.

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

• src/fortran/main/pm_distPower.F90