| Re: how to do a loop in idl using multi-commmand? [message #43530 is a reply to message #43529] |
Fri, 15 April 2005 12:49   |
Benjamin Hornberger
Messages: 258
Registered: March 2004
|
Senior Member |
|
|
If you do @filename, it runs as a batch file, meaning every statement,
line by line, is executed as if they were typed on the command line one
by one. You get the same error as on the command line.
What was meant in the previous post is a main-level program which has to
have an END statement and is run by ".run filename".
Go to the IDL help index and search for "batch file", then choose the
subentry "defined". You'll find a description of batch files, main-level
programs and named programs. David Fanning's book also describes it in
detail.
If you want a FOR loop on the command line or in a batch file, you'll
have to write it in one line, combining statements by "&":
FOR I=0, 10000 DO BEGIN & x=2*nH2[i] & y=x*nH2[i] & ratio[i]=x/y & ENDFOR
Note that the news client might have introduced a line break. This must
be all in one line! I guess you realize it's better (more elegant, more
understandable) to put it into a main-level or named program.
Good luck,
Benjamin
lixiaoyao wrote:
> I use @filename.pro to run it,it is still wrong. any other suggestion?
> for i=0,10000 do
> ^
> % Syntax error.
> At: /n/a/liletian/test.pro, Line 3
> % Variable is undefined: I.
> % Execution halted at: $MAIN$
> % Variable is undefined: I.
> % Execution halted at: $MAIN$
> % Variable is undefined: Y.
> % Execution halted at: $MAIN$
>
> endfor
> ^
> % Syntax error.
> At: /n/a/liletian/test.pro, Line 9
>
> end
> ^
> % Syntax error.
> At: /n/a/liletian/test.pro, Line 13
>
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
