How to concentrate matrix 100 times?

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Tsuwei Tan
Tsuwei Tan 2019-2-11
编辑： Stephen23 2019-2-11
for testnum=1:100
filesavepath=['H:\Desktop\0208\' num2str(testnum) '_sen'];
load(fullfile([filesavepath '\0208_' num2str(testnum) '_sen_avg_3.mat']),'matrix_avg');
eval(sprintf('matrix_%g=matrix_avg;',testnum));
end
matrix=cat(2,matrix_1,matrix_2,matrix_3,matrix_4,matrix_5,matrix_6,matrix_7,matrix_8,matrix_9,matrix_10,matrix_11,matrix_12);
I am trying to concentrate 100 matrix for instance. I know how to load them 100 times at different folder, but how to make my last line
matrix=cat(2,matrix_1,matrix_2,.....matrix_99,matrix_100);
Thank you!
  1 个评论
Geoff Hayes
Geoff Hayes 2019-2-11
Tsuwei - are all of your matrices of the same dimension? If not, then you could use a cell array to store all of these matrices.
myMatrices = cell(100,1);
for testnum=1:100
filesavepath=['H:\Desktop\0208\' num2str(testnum) '_sen'];
load(fullfile([filesavepath '\0208_' num2str(testnum) '_sen_avg_3.mat']),'matrix_avg');
myMatrices{testNum} = matrix_avg;
end
If they are all of the same dimension then you should be able to create a single matrix that is sized appropriately.
In either case, try to avoid dynamically creating matrices with eval. This can lead to errors and has been discussed elsewhere in this forum.

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Stephen23
Stephen23 2019-2-11
编辑：Stephen23 2019-2-11
Your approach is entirely in the wrong direction: using numbered variables is a sign that you are doing something wrong with your data/code design. Read this to know some of the reasons why:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
The simpler alternative is to load the file data into an output variable (which is a structure), then your task is trivially easy (and much more efficient):
N = 100;
C = cell(1,N);
for k = 1:N
F = fullfile(...);
S = load(F,'matrix_avg');
C{k} = S.matrix_avg;
end
M = cat(2,C{:})
See also:
https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html
https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

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