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How can I generate a matrix with the same vector in all the lines?

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Lorenz
Lorenz 2012-11-13
Hello,
I'd like to generate a matrix with the same vector n times. What I can choose. For example:
A= [ 1 2 3; 1 2 3; 1 2 3; .....n times......; 1 2 3]
Thank You

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Sean de Wolski
Sean de Wolski 2012-11-13
A = repmat(1:3,n,1)
And to learn more:
doc repmat

更多回答（3 个）

Evan
Evan 2012-11-13
编辑：Evan 2012-11-13
Another option:
V = [1:3];
n = 4; % desired number of rows
M = ones(n,1) * V
Returns
M = [1 2 3
1 2 3
1 2 3
1 2 3]
Matt Fig
Matt Fig 2012-11-13
I think this is what REPMAT probably is doing behind the scenes:
V = 1:3;
M = V(ones(1,4),:)
Walter Roberson
Walter Roberson 2012-11-13
t = 1:3;
A = t(ones(n,1), :); %what repmat will do internally so faster than repmat
or
kron(1:3, ones(n,1)); %slower than repmat but kron() has some good uses

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