| Re: how to debug floating error [message #31381 is a reply to message #31380] |
Wed, 10 July 2002 03:36  |
user
Messages: 8
Registered: August 1999
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Junior Member |
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well i don't know if this is going to help at all, but i had a
quite similar problem when
i started using idl few weeks ago. i operated alog() to a matrix
which contained negative
values. error message was:
% Program caused arithmetic error: Floating divide by 0
% Program caused arithmetic error: Floating illegal operand
but the operation still ran to the end. values that couldn't be
calculated were replaced
with string '-NaN' in the result matrix. now you can at least
start tracing the problem :)
just convert the image matrix to string and execute the command
print,where(string_matrix eq ' -NaN')
notice the white spaces :)
check your calculations
and think what values are considered as 'bad data'. i hope this helps.
oh, the other possible string can be '-Inf'
-sauli
Julia wrote:
> Hi, there,
>
> I made a program to do the FFT analysis of an image. After the program
> terminated, there are some error information printed in the log window:
> "
> % Program caused arithmetic error: Floating underflow
> % Program caused arithmetic error: Floating overflow
> % Program caused arithmetic error: Floating illegal operand
> "
>
> The program can run till the end of it. And only these error informations
> are displayed. How can I know where these errors occure? How can I debug
> them out?
>
> Any suggestion will be appreciated,
>
> Julia
>
>
>
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