Chapter Contents
Previous
Next
|
Chapter Contents |
Previous |
Next |
| DIGAMMA |
| Category: | Mathematical |
| Syntax | |
| Arguments | |
| Details | |
| Example |
Syntax |
| DIGAMMA(argument) |
| Restriction: | Nonpositive integers are invalid. |
| Details |
The DIGAMMA function returns the ratio that is given by
![[IMAGE]](./images/deqn62.gif)
where
![[IMAGE]](./images/leqn16.gif)
and
![[IMAGE]](./images/leqn17.gif)
denote the Gamma function and its derivative, respectively.
For argument>0, the DIGAMMA function is the derivative of the
LGAMMA function.
| Example |
| SAS Statements | Results |
|---|---|
x=digamma(1.0); |
-0.577215665 |
|
Chapter Contents |
Previous |
Next |
 Top of Page |
Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.