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Re: Replicate from [1, 148] to [1000, 148] [message #30347 is a reply to message #30346]

Thu, 18 April 2002 13:46

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

"chi-kuei" <cw94@cornell.edu> wrote in message
news:a9nar8$pg7$1@news01.cit.cornell.edu...
> Hi all,
>
> I have a [1000,148] matrix. Each column is a data stream and needs to be
> subtracted by a [1,148] matrix. Since I can't find a way to do it in one
IDL
> line, i.e.,
>
> [1000,148]-[1,148]
>
> I have to do it this way:
>
> [1000,148] - replicate([1,148], 1000)
>
> However, the replicate won't do the job. Right now I am doing this by a
> loop. This really slows the procedure down. Is there any better way to do
> it?

Using your informal notation, this is a good way to do it:

[1000,148] - Rebin([1,148], 1000, 148)

This effectively copies each item across the 1000 columns, giving the shape
that you want. Replicate really won't work here.

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		Re: Replicate from [1, 148] to [1000, 148] By: Wang, Chi-Kuei on Thu, 18 April 2002 18:46
		Re: Replicate from [1, 148] to [1000, 148] By: mperrin+news on Thu, 18 April 2002 16:17
		Re: Replicate from [1, 148] to [1000, 148] By: Dick Jackson on Thu, 18 April 2002 13:46

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