summation of matrix in column

hi, i have this final_mat (40x11), below is my code. What i trying to do is,first it will check the value of j:1 equal to j (1,2,3,4). If true, i need to sum between column in the same value of j. I tried few times but end up summation of row . and tried again until..this is my last code since fews time since morning :(

Please give me some idea how to solve this.

example of final_mat:

1 13 25 15 11 11 14 12 12 10 14

1 14 25 15 11 11 14 12 12 10 10

sum 27 50 30 22 22 28 24 24 20 24

2 13 26 14 11 11 14 12 12 13 13

2 13 25 14 12 11 14 12 12 13 13

2 13 25 14 11 11 14 12 13 13 13

3 13 24 14 11 11 14 12 12 12 14

3 13 24 14 10 11 14 12 12 13 14

  for n= 1:40
  for j=1:4
          if final_mat(j:1)==j
              for jj=2:11
              sum=sum+final_mat(:,jj) % stuck here.
          end
  end

Answer 1

[Andrei Bobrov]

final_mat = [ 1    13    25    15    11    11    14    12    12    10    14
1    14    25    15    11    11    14    12    12    10    10
2    13    26    14    11    11    14    12    12    13    13
2    13    25    14    12    11    14    12    12    13    13
2    13    25    14    11    11    14    12    13    13    13
3    13    24    14    11    11    14    12    12    12    14
3    13    24    14    10    11    14    12    12    13    14];

out = varfun(@sum,array2table(final_mat),'GroupingVariables',1)
out = out{:,[1,3:end]};

or

 [i,j] = ndgrid(final_mat(:,1),1:size(final_mat,2));
 out = accumarray([i(:),j(:)],final_mat(:),[],@sum);
 out(:,1) = unique(final_mat(:,1));

[Khairul Nur]

its run perfectly! BTW can u explain more on the code, please..

for below code, use the varfun(func,A,'GroupingVariables','Var1') use the group count.

out = varfun(@sum,array2table(final_mat),'GroupingVariables',1)

how about this one?

out = out{:,[1,3:end]};

TQ again for ur time an helpful code.

[Andrei Bobrov]

Please read about 'Name-Value Pair Argument' - 'GroupingVariable' - may be name of variable (name of column of table) or number of column of table.