How to do loop in the Workspace?

I have four matrixes c1 c2 c3 c4 (each matrix is 45x9)in the workspace. I need to calculate the mean for each row in each matrix.

The code I tried does not work:

c = {c1, c2, c3, c4};
for j = 1:4
    mean_c(j) = mean(c{j},2);
end

Answer 1

[Stephen23]

Method One: for loop:

c = {rand(45,9), rand(45,9), rand(45,9), rand(45,9)};
d = cell(size(c));
for k = 1:numel(c)
   d{k} = mean(c{k},2);
end

Method Two: cellfun:

 d = cellfun(@(m)mean(m,2),c,'UniformOutput',false);

Convert to numeric by simply using cell2mat:

>> cell2mat(d)
ans =
 0.49524   0.40269   0.65561   0.47278
 0.59244   0.52532   0.41187   0.42431
 0.34457   0.58936   0.54098   0.55274
 0.52958   0.62364   0.50265   0.52148
 0.70699   0.65555   0.58959   0.48702
 0.38250   0.34663   0.54874   0.48712
 0.59373   0.44404   0.62564   0.39276
 0.48016   0.59843   0.57385   0.48644
 0.49235   0.52315   0.52946   0.53855
 0.51168   0.69419   0.46208   0.35696
 0.53927   0.46378   0.48168   0.49156
etc

Answer 2

[Andrei Bobrov]

C = cat(1,c1,c2,c3,c4);
d = reshape(mean(C,2),size(c1,1),[]);

or

C = cat(1,c{:});
d = reshape(mean(C,2),size(c1,1),[]);

Answer 3

[KSSV]

clc;close all;clear all;
% Take some random data for c1,c2,c3,c4
c1 = rand(45,9) ;
c2 = rand(45,9) ;
c3 = rand(45,9) ;
c4 = rand(45,9) ;
c{1} = c1 ;
c{2} = c2 ;
c{3} = c3 ;
c{4} = c4 ;
mean_c = zeros(45,4) ;  % initialize the mean for each ci
for j = 1:4
    mean_c(:,j) = mean(c{j},2);
end