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# PDF

Evaluates the Angle distribution PDF.
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## PDF

 doublePDF( double x int n )[inline]
This component evaluates the PDF of the Angle distribution with given arguments. x is an angle between 0 and , corresponding to the angle made in an n dimensional space, between a fixed line passing through the origin, and an arbitrary line that also passes through the origin, which is specified by choosing any point on the n dimensional sphere with uniform probability.

The Angle PDF is defined by the following formula

and for all

The mean of this distribution is given by

In the example that follows, the PDF is evaluated using a fixed value for n, equal to 3, while the first argument x takes values from 0 up to 2 with a step equal to 0.2. The mean of the distribution, stored as a constant inside the same namespace, is also displayed. The maximum number of precision digits, implicitly set to 17, may be changed through the PRECISION define.

### Example 1

#include <codecogs/statistics/distributions/continuous/angle/pdf.h>
#include <iostream>
#include <iomanip>

#define PRECISION 17

int main()
{
std::cout << "The values of the Angle PDF with n = 3 and";
std::cout << std::endl;
std::cout << "x = {0, 0.2, 0.4, ..., 1.8, 2} are" << std::endl;
std::cout << std::endl;
for (double x = 0; x < 2.1; x += 0.2)
{
std::cout << std::setprecision(2);
std::cout << "x = " << std::setw(3) << x << " : ";
std::cout << std::setprecision(PRECISION);
std::cout << Stats::Dists::Continuous::Angle::PDF(x, 3);
std::cout << std::endl;
}
std::cout << std::endl;
std::cout << "The mean of the Angle distribution is equal to";
std::cout << std::endl;
std::cout << Stats::Dists::Continuous::Angle::mean;
std::cout << std::endl;
return 0;
}
Output:
The values of the Angle PDF with n = 3 and
x = {0, 0.2, 0.4, ..., 1.8, 2} are

x = 0 : 0
x = 0.2 : 0.099334665397530608
x = 0.4 : 0.19470917115432523
x = 0.6 : 0.28232123669751769
x = 0.8 : 0.35867804544976134
x = 1 : 0.4207354924039482
x = 1.2 : 0.46601954298361309
x = 1.4 : 0.49272486499422996
x = 1.6 : 0.49978680152075255
x = 1.8 : 0.48692381543909757
x = 2 : 0.45464871341284085

The mean of the Angle distribution is equal to
1.5707963267948966

### References

John Burkardt's library of statistical C++ routines, http://www.csit.fsu.edu/~burkardt/cpp_src/prob/prob.html

### Parameters

 x the argument of the PDF n the spatial dimension (must be at least 2)

### Returns

the value of the Angle PDF evaluated with the given arguments

### Authors

Lucian Bentea (September 2005)
##### Source Code

Source code is available when you agree to a GP Licence or buy a Commercial Licence.

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