; $Id: gamma.pro,v 1.10 2001/05/04 21:01:57 ali Exp $ ; ; Copyright (c) 1995-2001, Research Systems, Inc. All rights reserved. ; Unauthorized reproduction prohibited. ;+ ; NAME: ; GAMMA ; PURPOSE: ; The introduction of the GAMMA function as a built in system routine ; in IDL 4.0 caused inconvenience to customers with existing code ; in which GAMMA had been used as a variable, because IDL system ; routines have precedence over variable names. To minimize this ; problem, RSI has renamed GAMMA to NR_GAMMA. ; ; This wrapper serves to make NR_GAMMA available under the name ; GAMMA as documented in the IDL Reference Manual. However, since ; IDL library routines have lower precedence than variables, programs ; that use GAMMA as a variable name will work as before. ; ; See the documentation for GAMMA in the IDL Reference manual for ; details on arguments, keywords, and results. ; ; ; MODIFICATION HISTORY: ; 3 July 1995, AB, RSI. ; AB, 5/4/2001, Switch from using _EXTRA to _STRICT_EXTRA, so that ; incorrect keywords will cause issue proper messages to ; be issued instead of being silently ignored. ;- function gamma, x, _REF_EXTRA=extra ON_ERROR, 2 return, NR_GAMMA(x, _strict_extra=extra) end
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