The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: changing a 2D array into a 3D array
Replies: 6   Last Post: May 10, 2013 7:29 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Heng Sun

Posts: 1
Registered: 5/2/09
Re: changing a 2D array into a 3D array
Posted: May 2, 2009 11:39 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

This is a nice solution. Now I have a converse problem. Using Jos example

A = rand(2,4) ;
N = 3 ;
B = repmat(A,[1 1 N])

So I have a 3D array coming from 2D array. Now I take average along first dimension:

C = mean(B, 1);

I still have a 3D array, though the first dimension has length 1. I really would like to convert it to a 2D matrix for later computation. How do I do it without using loops?

Many thanks!


"Jos " <> wrote in message <frnvri$5cb$>...
> Use REPMAT to create N planes of the 2D matrix A:
> A = rand(2,4) ;
> N = 3 ;
> B = repmat(A,1,1,N)
> B is now a 2-by-4-by-3 matrix
> hth
> Jos

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.