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Programming > Idl-pvware > Re: array conca...
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Re: array concatenation in 2-D

by Spon <christoph.blau@[EMAIL PROTECTED] > Apr 8, 2008 at 11:37 PM

On Apr 9, 2:19 am, elwood <epolo...@[EMAIL PROTECTED]
> wrote:
> Alas, this is a form of concatenation, but it does not produce
> the required results.
> I need to concatenate by COLUMN, not row.
> If I code the concatenation you show, it produces:
> column 1:
> 1 2
> 3 4
> 5 6
>
> Whereas I need it to paste the columns together such that I
> get
> 1  3  5
> 2  4  6
>
> To be specific, each iteration of the loop
> I calculate new values of x and y
> I want to do the following, but using concatenation
> outputarry[0,0]=x1
> outputarry[1,0]=y1
>
> next iteration
> outputarry[0,1]=x2
> outputarry[1,1]=y2
>
> to get a final array where x values are in column 0
> y values are in column 1

You're almost where you want to be :-)
You can use TRANSPOSE your array to get the desired effect. It does
make concatenating a little bit more tricky, but with the help of
these two tutorials:

http://www.dfanning.com/tips/array_concatenation.html
http://www.dfanning.com/tips/rebin_magic.html

you'll be flying through it before you know it!
Alternatively you can let your concatenation happen row-by-row until
you're done, and then just transpose at the end, if that's simpler.

Good luck,

Chris
 




 9 Posts in Topic:
array concatenation in 2-D
elwood <epolomsk@[EMAI  2008-04-04 11:38:54 
Re: array concatenation in 2-D
David Fanning <news@[E  2008-04-04 12:57:21 
Re: array concatenation in 2-D
"R.G. Stockwell"  2008-04-04 13:27:03 
Re: array concatenation in 2-D
David Fanning <news@[E  2008-04-04 13:40:09 
Re: array concatenation in 2-D
Jean H <jghasban@[EMAI  2008-04-04 13:31:13 
Re: array concatenation in 2-D
"ben.bighair" &  2008-04-04 14:25:35 
Re: array concatenation in 2-D
elwood <epolomsk@[EMAI  2008-04-08 18:19:27 
Re: array concatenation in 2-D
Jean H <jghasban@[EMAI  2008-04-09 09:44:29 
Re: array concatenation in 2-D
Spon <christoph.blau@[  2008-04-08 23:37:12 

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