How to find row and column of a value in cell array

조회 수: 1 (최근 30일)
Vishal Sharma
Vishal Sharma 2017년 1월 25일
댓글: Walter Roberson 2017년 1월 25일
I have this Cell Array ‘A’ of size 3 by 7
A = {
3 4 [] [] [] [] []
2 6 -2 2 -2.1 2 2
-5 -5 25 1 [] [] []}
I want the result of max value of this cell array i.e. ‘25’ at row 3 and column 3 shall be displayed.

답변 (1개)

Walter Roberson
Walter Roberson 2017년 1월 25일
편집: Walter Roberson 2017년 1월 25일
B = A;
B(cellfun(@isempty, B)) = {NaN};
[maxval, maxidx] = max( reshape(cell2mat(B), [], 1) );
[maxrow, maxcol] = ind2sub(size(B), maxidx);
[maxval, maxrow, maxcol]
Note: this treats empty and NaN the same. If the array happened to consist entirely of NaN and empty locations, the code would return location 1 1, which might in some sense be incorrect because that location might be empty. However in such a case it is difficult to argue that NaN is a valid maximum since by definition NaN is Not A Number.
  댓글 수: 5
Vishal Sharma
Vishal Sharma 2017년 1월 25일
편집: Vishal Sharma 2017년 1월 25일
The index is '8'.... I want to get the solution in terms of rows (3rd) and column (3rd).... That's my main problem....
Walter Roberson
Walter Roberson 2017년 1월 25일
maxrow and maxcol give that information.
With your data
A = {
3 4 [] [] [] [] []
2 6 -2 2 -2.1 2 2
-5 -5 25 1 [] [] []}
then my code
B = A;
B(cellfun(@isempty, B)) = {NaN};
[maxval, maxidx] = max( reshape(cell2mat(B), [], 1) );
[maxrow, maxcol] = ind2sub(size(B), maxidx);
[maxval, maxrow, maxcol]
is going to create an answer
25 3 3
which is the maximum value then the row it is at and the column it is at.

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