MATLAB Answers

How to find the index of the center element in a 2d array if all the elements are the same?

조회 수: 8(최근 30일)
Tim
Tim 26 Feb 2020
댓글: Star Strider 27 Feb 2020
I'm attempting to find the index of the center element to be used later on.
I have a 5x5 array of -1's created with the following code.
x = -1*ones(5,5)
I'm able to find the index of the center element if the center element differs from the other elements using find (x == value).

  댓글 수: 0

댓글을 달려면 로그인하십시오.

채택된 답변

Star Strider
Star Strider 26 Feb 2020
If all the elements are the same, one approach is:
x = -1*ones(5,5);
[r,c] = ind2sub(size(x), ceil(numel(x)/2))
Thsi will only work on matrices with odd numbers of elements.

  댓글 수: 2

Tim
Tim 27 Feb 2020
Thanks for the response. That wasn't exactly what I was looking for but your response helped me arrive at what I was looking for. The approach I used to find the linear index is:
x = -1*ones(5,5);
indx = sub2ind(size(x),ceil(length(x)/2),ceil(length(x)/2))
indx =
13
Star Strider
Star Strider 27 Feb 2020
As always, my pleasure!
The linear index is actually just:
indx = ceil(numel(x)/2);
I wasn’t certain which one you wanted, so I opted for the subscripts as the desired result.

댓글을 달려면 로그인하십시오.

추가 답변(0개)

태그

Community Treasure Hunt

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

Start Hunting!

Translated by