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Finding the row and column number in a matrix

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Raghuram
Raghuram 2011-3-15
评论： Meryem 2014-9-4
for a matrix [1 2 3 4 6 10 7 5 9] mXn matrix-- how is it that i can find the min or max element and then find the row number and the column number for further use in calculations
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Meryem
Meryem 2014-9-4
You can have an answer with a few lines of code which is:
%you have ndata matrix
[r,c] = size(ndata); %get row and column values of data matrix
fprintf('\nRow of data matrix is: %d' ,r); %print number of row
fprintf('\nColumn of data matrix is: %d ' ,c); %print number of column

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采纳的回答

Jan
Jan 2011-3-15
data = rand(5, 3);
[maxNum, maxIndex] = max(data(:));
[row, col] = ind2sub(size(data), maxIndex);
Another less compact approach finds the max values for each column at first:
data = rand(5, 3);
[maxNumCol, maxIndexCol] = max(data);
[maxNum, col] = max(maxNumCol);
row = maxIndexCol(col);
Please read "help max" also.
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更多回答（2 个）

Rajashree Jain
Rajashree Jain 2011-3-15
[val row]=max(A(:));
[val col]=max(A(row,:));
[val row col];
  1 个评论
Jan
Jan 2011-3-15
This will not work. In the first line you can get e.g. the last element of A as maximum, then "row==numel(A)". Then "A(row, :)" will fail.

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Amey
Amey 2011-3-15
The first answer given by Jan Simon is absolutely right and the most efficient way to do it.

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