MATLAB: HOW TO TAKE AVERAGE OF ROW AND COLUMN AT SOME POINT

Question

I HAVE A MATRIX

   2 5 3 500 4 5,
   3 4 2 2  3  5,
   4 5 5 1  2   2

code must scan first where 500 exists and take average of that row and column wher 500 exists excluding that 500,

here ans should be like avg row at first 2+5+3+4+5/5 and avg col of that point 2+1/2,

Answer 1

This works:

M = [2 5 3 500  4  5
     3 4 2   2  3  5
     4 5 5   1  2  2];
[r,c] = find(M == 500);
RowAvg = mean(M(r,M(r,:)~=500));
ColAvg = mean(M(M(:,c)~=500,c));