| Weirdest Error Ever [message #50760] |
Wed, 18 October 2006 10:37 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
I've been working this morning on an error that is so
weird I'm beginning to think it is possible I have
completely lost my mind.
The error occurs in my COLORBAR routine. I have two
files. The files are identical, except for the following
line.
File that works perfectly:
bar = BYTSCL(bar, TOP=(ncolors-1 < (255-bottom))) + bottom
File that fails:
bar = BYTSCL(bar, TOP=(ncolors-1) < (255-bottom)) + bottom
In both files, the following three lines follow the line above:
IF Keyword_Set(reverse) THEN BEGIN
bar = Reverse(bar,1)
ENDIF
The variable bar is defined originally like this:
bar = BINDGEN(ncolors) # REPLICATE(1B, 20)
where ncolors is 256, so it is a 256 by 20 byte array. The variable
bottom is 0.
The error occurs on the line containing REVERSE. Here is the error:
IDL> Colorbar, /Reverse
Subscript range values of the form low:high must be >= 0, < size,
with low <= high: REVERSE.
Error occurred at: COLORBAR 286 C:\RSI\IDL Course\colorbar.pro
$MAIN$
Execution halted at: $MAIN$
Oddly, REVERSE, which is an IDL library routine is *not* compiled
when the error occurs, and I am certain the error is not coming from
REVERSE, because I can't step into REVERSE as I try to debug the
program. I think the error is a system error from IDL
Even MORE oddly, if I start a fresh session and compile REVERSE
before I do anything else, the program that fails works perfectly!!
If I start a fresh session and compile the program that fails, then
compile REVERSE, then run the program, it *still* fails.
Here is the result of HELP, /SOURCE in the latter case, which
is *identical* to the same command in the former case:
IDL> help, /source
Compiled Procedures:
$MAIN$
COLORBAR C:\RSI\IDL Course\colorbar.pro
Compiled Functions:
REVERSE C:\RSI\IDL62\lib\reverse.pro
If I start a fresh session and just try to execute the code that
seems to be giving me problems here, I have NO problem!
IDL> ncolors=256
IDL> bottom=0
IDL> bar = BINDGEN(ncolors) # REPLICATE(1B, 20)
IDL> bar = BYTSCL(bar, TOP=(ncolors-1) < (255-bottom)) + bottom
IDL> bar = reverse(bar, 1)
Compiled module: REVERSE.
Does anyone have the foggiest idea of what could be going on here!?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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