How to create multiple matrices with multiple variable?

Question

Hao Ming Low 2022-1-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633115-how-to-create-multiple-matrices-with-multiple-variable

回答： Chunru 2022-1-21

provided x=1:100

How to create 100 matrices (all must be having pattern of [x 0 0; 0 x 0; 0 0 x]) at the same time without typing it one by one?

P.S. : I meet this problem when studying multiple variable linear regression

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Answer 1

Chunru 2022-1-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633115-how-to-create-multiple-matrices-with-multiple-variable#answer_878780

在 MATLAB Online 中打开

n = 5;   % 100
% each slice of a is a matrix you want to produce:
a = eye(3).*reshape(1:n, [1 1 n])
a = 
a(:,:,1) =

     1     0     0
     0     1     0
     0     0     1


a(:,:,2) =

     2     0     0
     0     2     0
     0     0     2


a(:,:,3) =

     3     0     0
     0     3     0
     0     0     3


a(:,:,4) =

     4     0     0
     0     4     0
     0     0     4


a(:,:,5) =

     5     0     0
     0     5     0
     0     0     5