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Re: How can I append a leading or trailing column to an existing array? [message #51352 is a reply to message #51348]

Thu, 16 November 2006 13:52

Benjamin Hornberger is currently offline

Benjamin Hornberger
Messages: 258
Registered: March 2004

Senior Member

willettk@gmail.com wrote:
> G'day,
>
> I'm looking for a quick (ie, one-line method) of appending a column
> vector to an existing array. As a simple example I would like to make:
>
> 1 1
> 1 1
>
> into
>
> 2 1 1
> 2 1 1
>
> I can think of a few ways to do it (one is listed below), but I would
> really like to do it using array concatenation. I've read a good
> tutorial about it at Coyote's website, but can't figure out the proper
> bracketing. Any ideas?
>

IDL> a=[[1,1],[1,1]]
IDL> print,a
1 1
1 1
IDL> b=[[2],[2]]
IDL> print,b
2
2
IDL> c=[b,a]
IDL> print,c
2 1 1
2 1 1

The key is creating b with the correct dimensions. Another option is

IDL> b=reform([2,2],1,2)
IDL> print,b
2
2

Cheers,
Benjamin

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[Message index]

		Re: How can I append a leading or trailing column to an existing array? By: Wox on Fri, 17 November 2006 02:08
		Re: How can I append a leading or trailing column to an existing array? By: Wox on Fri, 17 November 2006 02:06
		Re: How can I append a leading or trailing column to an existing array? By: Benjamin Hornberger on Thu, 16 November 2006 13:52

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