Code running multiple times for different elements of a matrix

Hi everyone. I need some help to code this problem:
The data is 480x10 matrix(ret). I want to calculate the mean of each column from the past 120 elements of the same column
m1=mean(ret(1:120,1:10))
m2=mean(ret(2:121,1:10))
...
m360=mean(ret(360:480,1:10))
How can i do it with a loop and receive the results in a matrix 360x10.

 采纳的回答

m=conv2(ret,ones(120,1)/120,'valid')

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Thank you very much! It worked for me.
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