Check an entire matrix against each value of another matrix

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EYKL on 14 Jan 2022
Commented: Jon on 14 Jan 2022
Dear all,
I have the following code;
  1. I want to check matrix b against each value of matrix a, and extract values in matrix b based on a condition.
  2. The condition when delta 1 == 0, the value of matrix b corresponding to 0 is extracted into c.
However, I am getting an error Index in position 1 exceeds array bounds (must not exceed 1) in the line below. I have 2 questions:
  1. Why is this error happening?
  2. Is there another way to accomplish this without using loops?
Thank you.
a = [4 3];
b = [1 4.2 5 6 7 3.2];
c = zeros(size(a));
for i = 1:length(a)
delta1(i,:) = abs((b-a(i))/a(i));
for j = 1:length(delta1)
if delta1(i,j) < 0.3
c(i) = b(i,j); % This line

Accepted Answer

Jon on 14 Jan 2022
Edited: Jon on 14 Jan 2022
If I understand what you are looking for, I think this will do it in a very simple way
c = intersect(a,b)
>> a = [4 3];
b = [1 4 5 6 7 3];
c = intersect(a,b)
c =
3 4
Jon on 14 Jan 2022
You should also check out the MATLAB function ismembertol which is pretty much purpose built for the operation you are trying to perform, but the error tolerance is a little different. If you are comfortable with their way of computing the tolerance you can use this directly

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