source: trunk/SRC/Utilities/undefine.pro @ 134

Last change on this file since 134 was 134, checked in by navarro, 18 years ago

change *.pro file properties (del eof-style, del executable, set keywords Id
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 1.3 KB
RevLine 
[2]1;------------------------------------------------------------
2;------------------------------------------------------------
3;------------------------------------------------------------
4;+
5;
[133]6; @file_comments
7; erase a variable
8; same thing that delvar but usable in a program and usable
9; for one variable simultaneously
[2]10;
[133]11; @categories utilities 
[2]12;
[133]13; @param varname {in}{required} The name of the variable we want erase
[2]14;
[133]15; @example IDL> a=1
16;          IDL> undefine,a
17;          % Compiled module: UNDEFINE.
18;          IDL> help, a
19;          A               UNDEFINED = <Undefined>
[2]20;
[133]21; @history trouve sur la page web de D.Fanning
[2]22; http://www.dfanning.com :
23;QUESTION: How do I make an IDL variable have a type "undefined"?
24;ANSWER: At the main IDL level you can use the IDL procedure DELVAR to
25;delete an IDL variable and make it undefined. Inside of procedures
26;and functions, I use this little program named UNDEFINE that I got
27;from Andrew Cool at the DSTO High Frequency Radar Division in
28;Adelaide, Australia.
29;
30;-
31;------------------------------------------------------------
32;------------------------------------------------------------
33;------------------------------------------------------------
34   PRO UNDEFINE, varname 
[114]35;
36  compile_opt idl2, strictarrsubs
37;
[2]38   tempvar = SIZE(TEMPORARY(varname))
39   END
40
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