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Re: Matrices [message #82887 is a reply to message #42151]

Mon, 21 January 2013 06:48

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Monday, January 21, 2013 3:32:42 PM UTC+1, fd_...@mail.com wrote:
> Hello!
>
>
>
> I just start using IDL and I have one simple question about matrices.
>
>
>
> I want to create an N by 4 (Nx4)matrix and an N by 1 (Nx1)matrix with my own elements. Does anyone know how to do it?

Hi,
this is not normally the way people make things, however here is a command line option:
MyFiveByFourMatrix = [[0,4,8,12,16],[1,5,9,13,17],[2,6,10,14,18],[3,7,11,15,19]]
To check, just type:
help, MyFiveByFourMatrix

But generally you would like to use something like:
N=10
MyFiveByFourMatrix = Make_array(N,4,/INTEGER) ; Makes a 10x4 matrix

If you want to do a Nx1 matrix, use either:
N_by_One_Matrix = [0,1,2,3,4,5]
or
N_by_One_Matrix = Make_array(N,1,/INTEGER)

The above actually generates an array of N elements. If you really want a Nx1, then you should do the following:
N_by_One_Matrix = reform([0,1,2,3,4,5], 6,1)
or
N_by_One_Matrix = reform(Make_array(N,/INTEGER),N,1)

Hope it helps.

Cheers,
Helder

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[Message index]

		matrices with different size By: ikverveelmijdood on Thu, 13 January 2005 08:21
		Re: matrices with different size By: Chris Lee on Thu, 13 January 2005 14:30
		Re: Matrices By: Jeremy Bailin on Mon, 21 January 2013 12:06
		Re: Matrices By: fd_luni on Mon, 21 January 2013 09:55
		Re: Matrices By: fd_luni on Mon, 21 January 2013 09:39
		Re: Matrices By: Matthew Argall on Mon, 21 January 2013 07:21
		Re: Matrices By: Matthew Argall on Mon, 21 January 2013 07:20
		Re: Matrices By: Helder Marchetto on Mon, 21 January 2013 06:48

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