Creating Matrix using two vectors and scalar

2 views (last 30 days)
jack on 17 Dec 2015
Commented: jack on 18 Dec 2015
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.
jack on 18 Dec 2015
Thank you very much, i have solved it using repmat.

Sign in to comment.

Answers (2)

Andrei Bobrov
Andrei Bobrov on 17 Dec 2015
function out = fun1(r,c,ii)
out = ones(numel(c),1)*r;
out(:,ii) = c;
r = [2 7 3 5];
c = [2;7;10];
ii = 2;
out = fun1(r,c,ii);

Kirby Fears
Kirby Fears on 17 Dec 2015
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 .

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by