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Re: Strange array division problem [message #66278 is a reply to message #66277]

Wed, 06 May 2009 19:03

David Klassen
Messages: 27
Registered: December 2004

Junior Member

On May 5, 9:07 am, David Fanning <n...@dfanning.com> wrote:
> Dave Klassen writes:
>> This seems to do it (well, without the transpose---I assume because
>> IDL thinks of standard vectors as columns...?).
>
> No, IDL does not think of standard vectors as columns.

Hmmm...really?
IDL> a=[[2,1],[3,4]]
IDL> print,a
2 1
3 4
IDL> v=[5,6]
IDL> print,v
5 6
IDL> print,a##v
16
39
Which leads me to my original thought.

But, then again:
IDL> print,a#v
28 29

So I guess IDL figures a vector is whatever it need to be...?

Interestingly:
IDL> print,a##transpose(v)
16
39
But:
IDL> print,a#transpose(v)
% Operands of matrix multiply have incompatible dimensions: A,
<INT
Array[1, 2]>.
% Execution halted at: $MAIN$

So that's confusing.

> P.S. I'd give that result an extra pair of eyeballs
> before you turn it in for a final grade. :-)

Well, I didn't get extra eyes, but I did look long and hard, several
times, at the output and it looks like what I expect.

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[Message index]

		Re: Strange array division problem By: David Fanning on Wed, 06 May 2009 20:08
		Re: Strange array division problem By: David Klassen on Wed, 06 May 2009 19:03
		Re: Strange array division problem By: cgguido on Tue, 05 May 2009 14:23
		Re: Strange array division problem By: David Fanning on Tue, 05 May 2009 06:07
		Re: Strange array division problem By: David Klassen on Tue, 05 May 2009 05:44
		Re: Strange array division problem By: cgguido on Mon, 04 May 2009 16:52
		Re: Strange array division problem By: cgguido on Mon, 04 May 2009 16:35

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