psi (MathScript Function) (Windows, Not in Base Package)

LabVIEW 8.5 Help
August 2007

NI Part Number:
371361D-01

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Member of the advanced class.

Syntax

c = psi(a)

c = psi(a, b)

Computes the psi, or digamma, function.

Name	Description
a	Specifies a matrix of positive real numbers.
b	Specifies the derivative to use to compute the psi function.

Name	Description
c	Returns the psi function of a. If you specify b, c returns the b-th derivative of psi(a). c is a real matrix.

LabVIEW computes the psi function using the following equation: c = (1/gamma(a))*d(gamma(a))/da.

A = [0:0.01:2];
C = psi(A);
plot(A, C)