Need Matrix operation HELP

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Mahmoud Ahmed
Mahmoud Ahmed 2017-5-16
评论： James Tursa 2017-5-16
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?

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采纳的回答

Star Strider
Star Strider 2017-5-16
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
  1 个评论
James Tursa
James Tursa 2017-5-16
Did you try the code when you have a T(:,:,3) and T(:,:,4) to see what it does?

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更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2017-5-16
sum(T,2)

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