Matlab matrix minimum value

Question

I have aa matrix Number which contains

0.2728    0.2304    0.2008    0.1900    0.2008    0.2304    0.2728
0.2304    0.1786    0.1391    0.1233    0.1391    0.1786    0.2304
0.2008    0.1391    0.0843    0.0567    0.0843    0.1391    0.2008
0.1900    0.1233    0.0567    0.0100    0.0567    0.1233    0.1900
0.2008    0.1391    0.0843    0.0567    0.0843    0.1391    0.2008
0.2304    0.1786    0.1391    0.1233    0.1391    0.1786    0.2304
0.2728    0.2304    0.2008    0.1900    0.2008    0.2304    0.2728

I am trying to find the minimum value (or values if there are equal mins). I have tried

[min_val,idx]=min(number);

[row,col]=ind2sub(size(number),idx);

I am getting row 4 which is right but col 1 which clearly not the min, min is in the center. When I print min(number) I am give the whole of row 4 so I also tried

[min_val,idx]=min(min(number));

[row,col]=ind2sub(size(number),idx);

But i's giving the same result. I'm not really sure what's going on here. Any help would be appreciated!

Answer 1

Looks like you can use min and ind2sub to achieve your expected output:

matlab:1> number = [0.2728 0.2304 0.2008 0.1900 0.2008 0.2304 0.2728; 0.2304 0.1786 0.1391 0.1233 0.1391 0.1786 0.2304; 0.2008 0.1391 0.0843 0.0567 0.0843 0.1391 0.2008; 0.1900 0.1233 0.0567 0.0100 0.0567 0.1233 0.1900; 0.2008 0.1391 0.0843 0.0567 0.0843 0.1391 0.2008; 0.2304 0.1786 0.1391 0.1233 0.1391 0.1786 0.2304; 0.2728 0.2304 0.2008 0.1900 0.2008 0.2304 0.2728]
number =

   0.272800   0.230400   0.200800   0.190000   0.200800   0.230400   0.272800
   0.230400   0.178600   0.139100   0.123300   0.139100   0.178600   0.230400
   0.200800   0.139100   0.084300   0.056700   0.084300   0.139100   0.200800
   0.190000   0.123300   0.056700   0.010000   0.056700   0.123300   0.190000
   0.200800   0.139100   0.084300   0.056700   0.084300   0.139100   0.200800
   0.230400   0.178600   0.139100   0.123300   0.139100   0.178600   0.230400
   0.272800   0.230400   0.200800   0.190000   0.200800   0.230400   0.272800

matlab:2> [min_val, idx] = min(number(:))
min_val = 0.010000
idx = 25
matlab:3> [row, col] = ind2sub(size(number), idx)
row = 4
col = 4