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Is it an IDL bug or feature? [message #5249]

Wed, 25 October 1995 00:00

Liyun Wang
Messages: 4
Registered: October 1995

Junior Member

Hi,

In a process of debugging our IDL codes, we found an interesting case which you
may want to be aware of. Consider this:

IDL> b = 1
IDL> a = b(1,2,1)

IDL will complain about subscript being out of range. But watch this:

IDL> b = 1
IDL> a = b([2],[1],[2])
or
IDL> a = b([[2],[1],[10],[30]])
or even
IDL> a = b([[2],[,1],[10],[30]], [[20],[12],[70],[20]])

What do you think IDL will respond? Will it issue a syntax error message?
Wrong! As long as the subscript indices of a *scalar* variable, like b here,
are arrays with the same dimension, IDL does not care nor complain, no matter
how
many array elements you give. Do you consider this to be a potential bug or a
feature of IDL?

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Liyun Wang | Voice: 301-286-3126
G1 Building 26, SOHO EAF | FAX: 301-286-0264
NASA, GSFC, Code 682.3 | Liyun.Wang.1@gsfc.nasa.gov
Greenbelt, MD 20771 |http://orpheus.nascom.nasa.gov/~lwang
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Is it an IDL bug or feature?

By: Liyun Wang on Wed, 25 October 1995 00:00

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