Repeat matrix element of a given matrix

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Nikhil Chourasia
Nikhil Chourasia 2015-3-11
评论： Andrei Bobrov 2015-3-13
my matrix is x=[2 5 3 6 1]
I want it to make it as y=[2 2 2 2 5 5 5 5 3 3 3 3 6 6 6 6 1 1 1 1]
which function does it?

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采纳的回答

Jan
Jan 2015-3-11
编辑：Jan 2015-3-11
x = [2 5 3 6 1];
y = reshape(repmat(x, 4, 1), 1, []);
Or:
y = kron(x, ones(1, 4));
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Nikhil Chourasia
Nikhil Chourasia 2015-3-13
Hi Jan Simon can you help me to regain x from y. I have used kron in my coding.
Guillaume
Guillaume 2015-3-13
That would be
x = y(1:4:end);
This is basic matrix indexing.
In the future, start a new question rather than asking in comments.

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更多回答（3 个）

Stephen23
Stephen23 2015-3-11
编辑：Stephen23 2015-3-11
Another quick one-liner:
reshape(ones(4,1)*x,1,[])
Guillaume
Guillaume 2015-3-11
New in 2015a, repelem:
repelem(x, 4)
Andrei Bobrov
Andrei Bobrov 2015-3-11
x = [2 5 3 6 1];
y = x(ceil((1:4*numel(x))/4));

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