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Re: get IDL to issue warning or throw error for mismatched arrays [message #93334 is a reply to message #93331]

Thu, 16 June 2016 09:43

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

On Thursday, 16 June 2016 07:59:02 UTC-7, Markus Schmassmann wrote:
> is there any way to get IDL to issue a warning or throw an error in for
> mismatched arrays like those below?
>
> indgen(2,2)+indgen(3,3)

Hi Markus,

Here is the behaviour we see, that the result is the size of the "overlapping" of the two arrays:

IDL> help,indgen(2,2)+indgen(3,3)
<Expression> INT = Array[2, 2]

I was hopeful that COMPILE_OPT STRICTARRSUBS would help. Here's what it does, before:

IDL> a=indgen(5)
IDL> a[[3,4,5,6]]
3 4 4 4

... and after:

IDL> compile_opt strictarrsubs
IDL> a[[3,4,5,6]]
% Array used to subscript array contains out of range subscript: A.
% Execution halted at: $MAIN$

So, the STRICTARRSUBS is making a difference in that regard, but...

IDL> help,indgen(2,2)+indgen(3,3)
<Expression> INT = Array[2, 2]

It does not change the behaviour with different-shaped arrays. If you have to test arrays a and b for differing shape, a simple check is:

IF ~Array_Equal(Size(a, /DIMENSIONS), Size(b, /DIMENSIONS)) THEN ...

Hope this helps,
-Dick

Dick Jackson Software Consulting Inc.
Victoria, BC, Canada --- http://www.d-jackson.com

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[Message index]

		get IDL to issue warning or throw error for mismatched arrays By: Markus Schmassmann on Thu, 16 June 2016 07:59
		Re: get IDL to issue warning or throw error for mismatched arrays By: Dick Jackson on Thu, 16 June 2016 09:43
		Re: get IDL to issue warning or throw error for mismatched arrays By: Markus Schmassmann on Fri, 17 June 2016 05:50
		Re: get IDL to issue warning or throw error for mismatched arrays By: wlandsman on Wed, 04 January 2017 19:25
		Re: get IDL to issue warning or throw error for mismatched arrays By: Bill Nel on Thu, 05 January 2017 15:12
		Re: get IDL to issue warning or throw error for mismatched arrays By: lecacheux.alain on Fri, 06 January 2017 05:21

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