How does this vector expanding work?
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Good night, I'm trying to understand how a vector can expand to a matrix using a vector formed by ones. Here is the example I'm trying to understand:
xx = [1 2 3]; yy = xx(ones(3,1),:);
I don't know how the part of xx(ones(3,1),:) works, and it would be great if you could explain it to me. The result of this operations is a 3x3 matrix:
1 2 3
1 2 3
1 2 3
Thank you!
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Sean de Wolski
2012-10-2
Think about it this way:
x = [1 2;3 4];
to index the first row of this, you would use:
x(1,:)
If you wanted to index the 2nd row then the first row:
x([2 1],:)
What you're doing above is essentially:
x([1 1 1],:)
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