Create parametric block diagonal matrix

Question

Mehdi Ghasem Moghadam 2017-2-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325146-create-parametric-block-diagonal-matrix

评论： Star Strider 2017-2-15

how can create parametric block diagonal matrix in Matlab

for i=1:2
    H = blkdiag(sym('H%d',num2str(i),[1 1]));
end

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Answer 1

Star Strider 2017-2-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325146-create-parametric-block-diagonal-matrix#answer_254876

在 MATLAB Online 中打开

See if this does what you want:

h = sym('H%d',[1 2]);                           % Create Vector
h = mat2cell(h, 1, [1 1]);                      % Convert Vector To Cell Array Of Individual Elements (Comma-Separated List)
H = blkdiag(h{:})                               % Desired Result
H =
[ H1,  0]
[  0, H2]

The blkdiag function wants a comma-separated list, and a cell array provides that. This code creates your initial vector (as I believe you want it), then converts it to a cell array, then uses it to create your block-diagonal matrix.

If this is not the result you want, please describe in detail what you want your desired result to be.

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Mehdi Ghasem Moghadam 2017-2-15

Thanks, but I need Block Diagonal matrix like: H = [ H1, 0] [ 0, H2] [ 0, H3]

Star Strider 2017-2-15

在 MATLAB Online 中打开

This seems to do what you want:

h = sym('H%d',[1 3]);                           % Create Vector
h = mat2cell(h, 1, [1 2]);                      % Convert To Cell Array
H = blkdiag(h{:}).'                             % Desired Result (Simple — Not Complex Conjugate — Transpose)
H =
[ H1,  0]
[  0, H2]
[  0, H3]