Check an entire matrix against each value of another matrix

1 view (last 30 days)
EYKL
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
end
end
end

Accepted Answer

Jon
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
  5 Comments
Jon
Jon on 14 Jan 2022
You should also check out the MATLAB function ismembertol https://www.mathworks.com/help/matlab/ref/ismembertol.html 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

Sign in to comment.

More Answers (0)

Products


Release

R2020b

Community Treasure Hunt

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

Start Hunting!