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Re: simple array math question [message #33708 is a reply to message #33704]

Thu, 16 January 2003 13:30

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Sean Raffuse" <sean@me.wustl.edu> writes:

> Hello.
>
> Here is what I believe will be a pretty simple question.
>
>>> a=[[1,2,3],[4,5,6],[7,8,9]]
>
>>> b=[1,2,3]
>
> What is the best (read, fastest) way to multiply b by each individual row of
> a? I would like to return a result of:
>
> [[1,4,9],[4,10,18],[7,14,27]]
>
> assuming my arithmatic is correct.

x = ([1,1,1]##b) * a

A more stylistically correct way to do it would be to REBIN/REFORM the
variable B into the proper dimensions.

Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: simple array math question By: marc schellens[1] on Sun, 19 January 2003 22:55
		Re: simple array math question By: Jeff Guerber on Fri, 17 January 2003 20:21
		Re: simple array math question By: Heinz Stege on Fri, 17 January 2003 16:51
		Re: simple array math question By: Sean Raffuse on Fri, 17 January 2003 14:10
		Re: simple array math question By: JD Smith on Fri, 17 January 2003 13:46
		Re: simple array math question By: Craig Markwardt on Thu, 16 January 2003 19:47
		Re: simple array math question By: Heinz Stege on Thu, 16 January 2003 16:26
		Re: simple array math question By: Craig Markwardt on Thu, 16 January 2003 13:30
		Re: simple array math question By: Pepijn Kenter on Fri, 24 January 2003 04:43
		Re: simple array math question By: JD Smith on Thu, 23 January 2003 08:53
		Re: simple array math question By: Heinz Stege on Sun, 26 January 2003 11:25
		Re: simple array math question By: Jeff Guerber on Sat, 25 January 2003 01:12

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