Can I construct a matrix multiplying a scalar and a vector?
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Jaime De La Mota Sanchis
on 11 Sep 2019
Commented: Jaime De La Mota Sanchis
on 11 Sep 2019
I have a scalar i=3 and a vector j=[4; 5]. I want to generate the matrix k=[3 4; 3 5].
Is there a way to multiply i and j to generate the matrix k?
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Accepted Answer
Jan
on 11 Sep 2019
Edited: Jan
on 11 Sep 2019
No, tis is not a standard multiplication. But you can create k based on i and j:
i = 3;
j = [4; 5];
% Solution 1:
k(:, 2) = j;
k(:, 1) = i;
% Solution 2:
k = i .* [1, 0; 1, 0] + j .* [0, 1; 0, 1]; % Auto-expanding, need Matlab >= R2016b
What is the general case? Why do you want a "multiplication"? Which is the problem you want to solve actually?
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