Need Matrix operation HELP

If I have:

T(:,:,1) =

     1     2     3
     4     5     6
     7     8     9

T(:,:,2) =

     1     4     7
     2     5     8
     3     6     9

I want to convert each matrix to be vector contains [(the sum of 1st row) (the sum of 2nd row) (the sum of 3rd row)] for example: Convert T(;,:,1) to be [6 15 24] where: 6 = 1+2+3 , 15 = 4+5+6 , 24 = 7+8+9 The same, Convert T(:,:,2) to be [12 15 18] where: 12 = 1+4+7 , 15 = 2+5+8 , 18 = 3+6+9 .. What's the function that can do it?

Answer 1

[Star Strider]

Use the sum function, specifying to sum acroww rows (dimension 2).

Example —

T1 = [1     2     3
      4     5     6
      7     8     9];

T2 = [1     4     7
      2     5     8
      3     6     9];

T = cat(3,T1,T2);

T_row_sum = sum(T,2)

T_row_sum(:,:,1) =

       6
      15
      24

T_row_sum(:,:,2) =

      12
      15
      18

[James Tursa]

Did you try the code when you have a T(:,:,3) and T(:,:,4) to see what it does?

Answer 2

[Fangjun Jiang]

sum(T,2)