how to save values from'if' loop?

for j = 1:sz_idx1(1,1)

         new_idx = idx1(j);

         alt_i = alt{new_idx};

         if ( alt_i== 'T')
             A_T = count+1;
         end

   end

Answer 1

[KSSV]

   count = 0 ;
    A_T = zeros([],1) ;
      for j = 1:sz_idx1(1,1)
               new_idx = idx1(j);
               alt_i = alt{new_idx};
               if ( alt_i== 'T')
                   A_T(count) = count+1;
               end
         end

[vasudha jain]

 Empty matrix: 0-by-1

Undefined function or variable 'count'.

Error in testrun (line 32) A_T(count) = count+1;

it shows this error

[KSSV]

I though you have already define count before for loop..edited the answer.

[vasudha jain]

Attempted to access A_T(0); index must be a positive integer or logical.

Error in testrun (line 31) A_T(count) = count+1;

i defined count before and it shows this error

[Jan]

Replace "A_T(count) = count+1;" by

count      = count + 1;
A_T(count) = count;

Answer 2

[Jan]

What about:

A_T = cumsum(strcmp(alt{idx1}, 'T'))

instead of the loops? Or perhaps you want:

A_T = sum(strcmp(alt{idx1}, 'T'))

or

A_T = 1:sum(strcmp(alt{idx1}, 'T'))