| Functions and CALL Routines |
Returns the value of the digamma function.
-
argument
-
specifies a numeric constant, variable,
or expression.
| Restriction: |
Nonpositive integers
are invalid. |
The DIGAMMA function returns the ratio
that is given by
![[equation]](images/deqn88.gif)
where
![[equation]](images/leqn51.gif)
and
![[equation]](images/leqn52.gif)
denote the Gamma function and its derivative, respectively.
For
argument>0, the DIGAMMA function is the derivative of the
LGAMMA function.
|
SAS Statements |
Results |
x=digamma(1.0);
|
-0.577215665
|
Copyright © 2011 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
