How do I find the column of maximum values of a maxtrix?

Let's say

x= [4, 90, 85, 75; 2, 55, 65, 75; 3, 78, 82, 79;...
    1, 84, 92, 93]

x =

4 90 85 75

2 55 65 75

3 78 82 79

1 84 92 93

If using

[a, b]= max(x)

a will be the maximum values in each columns while b will be their position in terms of rows

I will get

a =
     4    90    92    93

b =
     1     1     4     4

If using

max(x, [], 'all')

I will get the highest value throughout the columns and rows which is 93.

Now, how do I find the column of the highest value (93) ? Maybe something like

[a, b]= max(x)

but the position/index is in terms of column.

Answer 1

[Akira Agata]

If you want to find the column where the maximum value in 2D matrix locates, one simple way is:

[~,col] = max(max(x));

For example:

x= [4, 90, 85, 75; 2, 55, 65, 75; 3, 78, 82, 79;...
    1, 84, 92, 93];
[~,col] = max(max(x));

>> col

col =

4

Answer 2

[the cyclist]

Here is one way to do it.

[~,linearIndex] = max(x,[],'all','linear'); % First, find the *linear* index of x
[rowIndex,colIndex] = ind2sub(size(x),linearIndex); % Find the row and col indices from the linear index

Note that the first line could also have used the syntax

[~,linearIndex] = max(x(:))