Creating Matrix using two vectors and scalar

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jack
jack 2015-12-17
评论： jack 2015-12-18
Hi guys,
I need your help in solving the following problem: Given a row vector, a column vector and an index create a matrix in the following manner (look at example) without using cell arrays and the implementation should be fast:
Remark: "index" correspond to the row column!
Thanks in advance.
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jgg
jgg 2015-12-17
Try looking at the repmat function. I think it should solve your problem.
jack
jack 2015-12-18
Thank you very much, i have solved it using repmat.

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2015-12-17
function out = fun1(r,c,ii)
out = ones(numel(c),1)*r;
out(:,ii) = c;
end
use
r = [2 7 3 5];
c = [2;7;10];
ii = 2;
out = fun1(r,c,ii);
Kirby Fears
Kirby Fears 2015-12-17
jack,
Please read the repmat() documentation to understand its interface and functionality. With repmat, you can stack copies of your row vector into a matrix.
You should be able to determine how many copies of your row vector to stack based on the length() or size() of your column vector.
From there, you just have to insert the column vector into the appropriate column using array indexing .

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