comp.lang.idl-pvwave archive: archive » Re: Why does '[1,2,3] EQ [2]' yield zero but '[1,2,3] EQ 2' yield [0,1,0] ?

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Re: Why does '[1,2,3] EQ [2]' yield zero but '[1,2,3] EQ 2' yield [0,1,0] ? [message #54361 is a reply to message #54359]

Sat, 02 June 2007 05:44

wlandsman@jhu.edu
Messages: 12
Registered: September 2006

Junior Member

> my guess:
>
> [1,2,3] EQ [2] compares two sets, one with 3 elements and the other 1.
>
I think the better rule to remember is that when comparing two vectors, IDL
will truncate the longer vector prior to the comparison so that the two
vectors have the same length. So [1,2,3] EQ [2] is the same as [1] EQ [2].
For another example,

IDL> print, [1,2,3] eq [1,2]
1 1

>
> [1,2,3] EQ 2 compares each element of the first set with number 2.
>
That is correct. --Wayne

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[Message index]

		Re: Why does '[1,2,3] EQ [2]' yield zero but '[1,2,3] EQ 2' yield [0,1,0] ? By: cgguido on Sat, 02 June 2007 14:13
		Re: Why does '[1,2,3] EQ [2]' yield zero but '[1,2,3] EQ 2' yield [0,1,0] ? By: wlandsman@jhu.edu on Sat, 02 June 2007 05:44
		Re: Why does '[1,2,3] EQ [2]' yield zero but '[1,2,3] EQ 2' yield [0,1,0] ? By: sujian on Fri, 01 June 2007 21:29

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