How to do loop in the Workspace?

Question

Bruno 2016-9-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303736-how-to-do-loop-in-the-workspace

编辑： Andrei Bobrov 2016-9-20

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

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Answer 1

Stephen23 2016-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/303736-how-to-do-loop-in-the-workspace#answer_235367

编辑：Stephen23 2016-9-20

在 MATLAB Online 中打开

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 =
49524   0.40269   0.65561   0.47278
59244   0.52532   0.41187   0.42431
34457   0.58936   0.54098   0.55274
52958   0.62364   0.50265   0.52148
70699   0.65555   0.58959   0.48702
38250   0.34663   0.54874   0.48712
59373   0.44404   0.62564   0.39276
48016   0.59843   0.57385   0.48644
49235   0.52315   0.52946   0.53855
51168   0.69419   0.46208   0.35696
53927   0.46378   0.48168   0.49156
etc

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Answer 2

Andrei Bobrov 2016-9-20

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303736-how-to-do-loop-in-the-workspace#answer_235368

编辑：Andrei Bobrov 2016-9-20

在 MATLAB Online 中打开

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),[]);

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Answer 3

KSSV 2016-9-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303736-how-to-do-loop-in-the-workspace#answer_235366

编辑：KSSV 2016-9-20

在 MATLAB Online 中打开

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