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Re: array concatenation in 2-D [message #59623 is a reply to message #59622]

Fri, 04 April 2008 12:31

Jean H.
Messages: 472
Registered: July 2006

Senior Member

elwood wrote:
> I have a loop which calculates two variables x[i] and y[i]
>
> At each iteration of the loop I calculate
> x and y
> And I'd like to concatenate x and y into a 2 column, unknown numbers
> of rows
> output array.
> I'd like to dynamically grow the output array at each interation.
>
> For example:
> x=1 y=5 on first iteration
> x=2, y=6 on 2nd iteration
> I want an output array that looks like the below:
>
> 1 5
> 2 6
>
> How do i achieve this without knowing the array size??
>
>
> Tx!
> -Elisha

Elisha,
You can concatenate the arrays, as you suggest:

a = [[1,2],[3,4]]
a = [[a],[5,6]]
help,a
==>A INT = Array[2, 3]

However, if you have many elements, this can be very resources
consuming. Another option is to create a "big" 2*n array, to
progressively fill it, to keep a counter on the number of entries, and
finally to cut what you haven't used.... and similarly, if your array is
not big enough, add a large number of rows and keep filling them (use
the same concatenation method as above)

Jean

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[Message index]

		Re: array concatenation in 2-D By: ben.bighair on Fri, 04 April 2008 14:25
		Re: array concatenation in 2-D By: Jean H. on Fri, 04 April 2008 12:31
		Re: array concatenation in 2-D By: David Fanning on Fri, 04 April 2008 12:40
		Re: array concatenation in 2-D By: R.G. Stockwell on Fri, 04 April 2008 12:27
		Re: array concatenation in 2-D By: David Fanning on Fri, 04 April 2008 11:57
		Re: array concatenation in 2-D By: elwood on Tue, 08 April 2008 18:19

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