Sum all the Channels in matrix

Hello everyone,

Let say I have a matrix M of 100 x 100 x 5. How can I sum all the channels of M and get one matrix R of size 100 x 100 only. I want to do it without loops.

Answer 1

[Rick Rosson]

R = sum(M,3);

Answer 2

[Wayne King]

 M = randn(100,100,5);
 R = sum(M,3);

Did you read the help for sum?

[Aravin]

Thanks. I forget to see the man for sum