How to write a 'horizontal direct product' (*~) from Gauss in Matlab?

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Patrick
Patrick 2012-8-18
Hi,
I am trying to write the 'horizontal direct product' (*~) from Gauss in Matlab. Anyone can help me?
E.g. Horizontal direct product z = x*~y;
x = [1 2; 3 4]; y = [5 6; 7 8];
z = [5 6 10 12; 21 24 28 32]
NB. The input matrices x and y must have the same number of rows. The result will have cols( x) * cols( y) columns.
Thanks!

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采纳的回答

Matt Fig
Matt Fig 2012-8-18
z = repmat(y,1,size(x,2)).*kron(x,ones(1,size(y,2)))

更多回答（2 个）

Walter Roberson
Walter Roberson 2012-8-18
That is a subset of the output of kron(x,y)
  2 个评论
Patrick
Patrick 2012-8-18
Thanks, Walter. I noted that, but do you know how to extract this subset?
Walter Roberson
Walter Roberson 2012-8-18
Row indexing, but I do not know what the general pattern is (I would need a few additional examples of different lengths to go on.)

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Patrick
Patrick 2012-8-20
Thanks, Matt. That's perfect.

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