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Should SORT(Undefined) give an error message? [message #93037]

Wed, 13 April 2016 10:28

wlandsman
Messages: 743
Registered: June 2000

Senior Member

Currently one can SORT() an undefined variable without getting an error message

IDL> sort(undefined)
0

Certainly, the current result is inconsistent with the documentation:

"The result is always a vector of integer type with the same number of elements as Array." since in this case Array has 0 elements.

I think one should get an error message the same way one does with sqrt(undefined) or max(undefined)

In my case, the current behavior slowed down my debugging because I was using the sort index of Vector A to sort another vector B. Vector A was mistakenly undefined but Vector B was valid. Therefore, B[SORT(A)] was also valid, and the program happily proceeded. --Wayne

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[Message index]

		Should SORT(Undefined) give an error message? By: wlandsman on Wed, 13 April 2016 10:28
		Re: Should SORT(Undefined) give an error message? By: Lajos Foldy on Wed, 13 April 2016 14:03

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