Replacing same rows with same variables in first to third column

Hi. I have two matrices named aa and m.

 aa=[1     2     3     7
     4     5     6     8
     7     8     9     9
     3     2     3     8
     6     5     6     7
     7     8     7     9];

 mm=[1     2     3     5
     4     5     6     9
     7     8     9     6];

I want to replace the rows of aa with the rows of m that have the same values in first to third column.

How can I do that?

Thanks a lot.

[Image Analyst]

What if m is

mm=[1     2     3     5
    1     2     3     9
    4     5     6     9
    7     8     9     6];

Which row of m, the first or the second, should replace the first row of aa?

[mr mo]

In my case there are only one same rows in ‘aa’ and ‘mm’

Answer 1

[Jos (10584)]

No need for loops at all! Use both outputs of ismember and replace accordingly

   aa = [1     2     3     7
         4     5     6     8
         7     8     9     9
         3     2     3     8
         6     5     6     7
         7     8     7     9
         1     2     3     999];
   mm = [1     2     3     5
         4     5     6     9
         7     8     9     6];
   [tf,loc] = ismember(aa(:,1:3),mm(:,1:3),'rows') 
      % tf indicates which rows in aa are found where (loc) in mm (only for columns 1-3)
   aa(tf,:) = mm(loc(tf),:) % replace those rows

[Stephen23]

+1 the simplest is the best.

Answer 2

[KSSV]

aa(1:3,1:3) = mm(1:3,1:3) ;

[mr mo]

Thanks but this codes lost the fourth column values of mm.