How to select the columns of a matrix which are a multiple of 5?
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Answered: Ellen De Jonghe on 9 Jan 2020
I don't know how to solve the following exercise:
M is a 3x5000 matrix. A student wants to select the elements on the third row in all columns which are a multiple of 5.
The student writes the following script.
N = zeros(1,1000)
for i = 1:5000
if rem(i,5) == 0
N(i/5) = M(3,i);
I have to simplify it using only N = M(...). How do I do that?
Guillaume on 9 Jan 2020
It's hard to give you any help without giving the solution away (which would be cheating).
For which i values would the if be true? Couldn't you pass these values directly as indices of M and not bother with the loop?
N = M(3,5:5:end)
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