Matrix dimensions must agree problem

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fatima-zahra achbah 2017-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/357695-matrix-dimensions-must-agree-problem

评论： fatima-zahra achbah 2017-9-21

Hi, everyone! when I try to run my script they always tell me: Matrix dimensions must agree. I want to compare two matrices full with data imported from some XLS files. this is the script:

if true
clear
close all 
%C = cell(1,n);   % n is the total of csv files 
C = cell(1,6);
D = cell(1,6); % 
for k = 1:6 %n
name = sprintf('%04i.csv',k);  %I choose the notation 000k to make it easy on us to upload all the data 
C{k} = xlsread(name);
%figure(k),subplot(1,1,1),histogram(C{k}) %plot the histogram of each file
end
for i = 2:6
  D{i}=C{i}==C{i-1}; %the D cell is the cell where I put the diffrences between the C cells 
end
%A = cat(3,C{:});  %A is the matrix of all files 
%figure(1),subplot(1,1,1),histogram(A) %plot the histogram of all files
%%n+1
end

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Guillaume 2017-9-21

在 MATLAB Online 中打开

assert(isequal(size(C{i}), size(C{i-1})), ''Files are different sizes');

would work. Note that it won't fix the problem. It will just confirm whether or not the files are the same size.

I would recommend you use better variable names. Use full words that describe what's in the variable (e.g. thermalimages instead of C, imagedifferences instead of D, etc.). It makes your code instantly easier to understand and therefore easier to debug.

fatima-zahra achbah 2017-9-21