MATLAB: Calculate the mean of a matrix by the first column

average matrix

Hello,
I just leaned MATLAB.
I want to calculate the mean of a matrix by the first column:
Input:
1	9	7	5	7
2	1	1	1	3
2	5	5	4	4
3	1	1	1	3
3	5	5	4	4
3	1	1	1	3
3	5	6	4	4
4	1	8	1	3
4	5	5	4	4
5	1	5	1	3
6	1	4	1	3
7	5	5	4	4
Output:
1	9	7	5	7
2	3	3	2.5	3.5
3	3	3.25	2.5	3.5
4	3	6.5	2.5	3.5
5	5	1	5	1
6	6	1	4	1
7	7	5	5	4
My code:
G = findgroups(M(:,1 )); 
Out = [unique(M(:,1)) splitapply(@mean, M(:,2:end), G)]
Error using vertcat
Dimensions of matrices being concatenated are not consistent.
Error in splitapply>localapply (line 257)
            finalOut{curVar} = vertcat(funOut{:,curVar});
Error in splitapply (line 132)
varargout = localapply(fun,splitData,gdim,nargout);
Thanks in advance for any suggestions and help!
Yue

Best Answer

Out = [unique(M(:,1)) splitapply(@(z)mean(z,1), M(:,2:end), G)]
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