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2.1.16.6.5.8 real_polygamma


Contents

Description

Derivative of the psi function \psi(x)

Syntax

double real_polygamma( double x, int k )

Parameters

x
[input] the argument x of the funtion
k
[input] the kth derivative to be evaluated

Return

Returns the value of the kth derivative of the psi functions \psi(x) for real x and k=0,1...,6

Examples

EX1 

void real_polygamma_ex1()
{
	int k =2;
	double x =0.7;
	printf("%2ld	%4.1f:	%12.4e\n",k,x,real_polygamma(x,k));
}

Remark

See Also

Header to Include

origin.h

Reference