I have a matrix which is 1000 columns and 3621 rows, how do I take the mean of each row?

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Henn
Henn on 5 Sep 2017
Commented: Henn on 6 Sep 2017
Basically I want to turn my matrix from dimensions 3621x1000 into 3621x1 by taking the means of each row.
Thank you for your help.

Accepted Answer

Jacob Ward
Jacob Ward on 5 Sep 2017
In general, if you have a matrix A and want to take the mean across a certain dimension, dim, you should use mean(A,dim).
dim = 1 gives the mean for each column, dim = 2 gives the mean for each row, and so on.
Here's an example for your case:
M = rand(3621,1000);
size(M)
ans =
3621 1000
meanOfEachRow = mean(M,2)
size(meanOfEachRow)
ans =
3621 1

More Answers (1)

Ahmed Grera
Ahmed Grera on 5 Sep 2017
clc
clear all
a=[1 2 3;4 5 6;7 8 9] % Replace this matrix with your matrix
mean(a,2)

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