Normalize matrices of different sizes

Question

xiao wei 2020-11-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/637425-normalize-matrices-of-different-sizes

评论： xiao wei 2020-11-11

I have different size matrix a1, a2, a3...an, size of a1= [m n1]; size of a2=[m n2]; size of a3=[m n3];...size of an=[m nn]; this means that the row number of all the matrix is the same, but their columns number is different. How could I normalize them into matrix [m n], while n is the biggest column number of all matrix? the rest of colums of other matrix should be added with zero. finally, how can I save all new matrix into a 3-D matrix?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ameer Hamza 2020-11-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/637425-normalize-matrices-of-different-sizes#answer_535395

在 MATLAB Online 中打开

See this example

a1 = rand(3,4);
a2 = rand(3,7);
a3 = rand(3,2);
a4 = rand(3,5);
a = {a1, a2, a3, a4};
m = height(a{1});
n = max(cellfun(@width, a));
a = cellfun(@(x) {[x zeros(m, n-width(x))]}, a);
A = cat(3, a{:}) % 3D matrix

3 个评论
显示 1更早的评论隐藏 1更早的评论

Ameer Hamza 2020-11-9

Can you show your code?

xiao wei 2020-11-11

my code is as follows:

loadstr(:,1) ={'...'}; %file name

loadstr(:,2) = {... }; % file classification

for i = 1:numel(loadstr(:,1))

path = 'C:\...'; % path for file

file = loadstr{i,1};

fileName = strcat(path,file,'.mat');

vars{i} = load(fileName);

tmp (i) = structfun(@length,vars{i});

maxLength=max(tmp);

end

for i = 1:numel(loadstr(:,1))

a = cellfun(@(x) {[x zeros(126, maxLength-tmp(i))]}, vars(i));

end

my problem is:

how can I add zeros(126, maxLength-tmp(i)) to the end of each file and save it as new file (in the name of old file)?
how can I save these new files into a 3-D matrix?

请先登录，再进行评论。