Storing the generated matrices from a for loop into cell arrays and access them later to multiply them altogether

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Pascale Bou Chahine 2020-9-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/596200-storing-the-generated-matrices-from-a-for-loop-into-cell-arrays-and-access-them-later-to-multiply-th

评论： Pascale Bou Chahine 2020-9-19

I have to write the corresponding MATLAB algorithm to get the first column of M = (A - x_k*I)(A - x_(k-1)*I)(A - x_1*I), where A is an nxn matrix, I is the identity matrix, and x is a vector of length k.

Here is my algorithm:

function [M] = double1(A, x)
k = length(x);
[n,n] = size(A);
for i = k:-1:1
    M{i} = A-x(i)*eye(n);
end

I want to store the matrices that I get from my for loop into a cell array and access them later and multiply them altogether. How to do that? Any help, please?

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Pascale Bou Chahine 2020-9-19

No, she did want

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Answer 1

Stephen23 2020-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/596200-storing-the-generated-matrices-from-a-for-loop-into-cell-arrays-and-access-them-later-to-multiply-th#answer_497128

编辑：Stephen23 2020-9-19

在 MATLAB Online 中打开

No cell array required:

>> x = [2,5,23];
>> A = [9,8;7,6];
>> [n,n] = size(A);
>> M = 1;
>> for k=numel(x):-1:1; M = M*(A-x(k)*eye(n)); end
>> M
M =
  -728  -416
  -364  -572