maximizing efficiency in simple commands
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I have an array given by
x = [1 2 3 4];
I would like to create a matrix that looks like
M = [1 2 3 4;
1 2 3 4;
1 2 3 4;
1 2 3 4];
What's the most computationally efficient way to create M from x?
采纳的回答
Azzi Abdelmalek
2013-8-20
编辑：Azzi Abdelmalek
2013-8-20
x=[1 2 3 4];
M=repmat(x,4,1)
1 个评论
Walter Roberson
2013-8-20
Equivalently but removing the error checking:
x=[1 2 3 4];
M = x([1 1 1 1],:);
更多回答（1 个）
Andrei Bobrov
2013-8-20
编辑：Andrei Bobrov
2013-8-20
ones(4,1)*x
kron(ones(4,1),x)
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2013-8-20
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