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Re: setintersection assumes sets have no repetitions? [message #83311 is a reply to message #83310]

Sat, 23 February 2013 13:15

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On 2/23/13 2:46 PM, Paulo Penteado wrote:
>
> I am using Coyote's set functions, and I noticed that when I use some
> (not any) sets with repetitions as input, it crashes:
>
> IDL>
> a=[1,2,3,4,5]
> IDL>
> b=[1,2,2,2]
> IDL>
> print,setintersection(a,b,indices_a=ia,indices_b=ib,position s=pos)
> % Compiled module: SETINTERSECTION.
> % Compiled module: REVERSEINDICES.
> % Compiled module: ERROR_MESSAGE.
>
> Traceback Report from SETINTERSECTION:
>
> % Out of range subscript encountered: BINDICES.
> % Execution halted at: SETINTERSECTION 192 /software/idl/
> others/idl-coyote-read-only/coyote/setintersection.pro
> % $MAIN$
> -1
>
> Is this the expected behavior? Are the input sets supposed not to have
> repetitions? The documentation suggests they may have repeated
> elements, thus making the positions array different from indices_a.
>

By definition, a set only has one copy of each element, so I wouldn't be
surprised if things fail if it's not a true set.

-Jeremy.

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[Message index]

		Re: setintersection assumes sets have no repetitions? By: David Fanning on Sat, 23 February 2013 22:23
		Re: setintersection assumes sets have no repetitions? By: Jeremy Bailin on Sat, 23 February 2013 13:15
		Re: setintersection assumes sets have no repetitions? By: penteado on Tue, 05 March 2013 10:44

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