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Re: Concatenate arrays of different dimensions [message #51171 is a reply to message #51168]

Wed, 08 November 2006 09:31

cgguido
Messages: 195
Registered: August 2005

Senior Member

I seem to remember that concatenation is slow with big arrays or
something...

If you have to do this often (especially inside a loop!) and if you can
put a higher limit on the number of rows, I would do:

a=fltarr(40,N) ; you would do this outside the loop, if any.
; where N is a number that is an over estimate of the size you will
need at the end.

a[*]=-1
; or some value you know won't appear in real data. I seem to only ever
encounter positive ; numbers :-) Dunno if you could fill it with
NaNs....

;now you fill a with your sub arrays
a[*,0:29]=f
a[*,30:300+29]=f1
a[*,330:3330+329]=f2

;finaly clean it up
b=a[where(a[*] ne -1)]
a=0

Or someting along these lines anyway... hope this helps.

Gianguido

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[Message index]

		Re: Concatenate arrays of different dimensions By: Jean H. on Wed, 08 November 2006 09:52
		Re: Concatenate arrays of different dimensions By: cgguido on Wed, 08 November 2006 09:31
		Re: Concatenate arrays of different dimensions By: Dilkushi@gmail.com on Wed, 08 November 2006 06:51
		Re: Concatenate arrays of different dimensions By: greg michael on Wed, 08 November 2006 06:46

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