How to create a matrix with arbitrary dimensions

Question

Michael Haitz 2019-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/446034-how-to-create-a-matrix-with-arbitrary-dimensions

评论： Jos (10584) 2019-2-20

采纳的回答： Jos (10584)

Hi,

I like to create a matrix with arbitrary dimensions.

E.g., I need a function getMatrix(m, s), which returns a m-dimensional matrix with size s, filled with zeros or ones.

Could not working out until today, help is appreciated.

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Answer 1

Jos (10584) 2019-2-20

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To create an zero array of an arbitray dimensions between 1 and D with arbitry sizes between 1 and S :

D = 10 ;
S = 6 ;
X = arrayfun(@(x) randi(S), 1:randi(D),'un',0)
M = zeros(X{:})
[size(M) ; [X{:}]]

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Michael Haitz 2019-2-20

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Thank you, this is what I needed.

Maybe my question was not clear enough, I solved it the following way:

function [Res] = CreateMatrix(Dims, Sz)
    try        
        switch Dims
            case 1
                Res = zeros(1, Sz);
            otherwise    
                ds = ones(1, Dims);
                ds = ds .* Sz;
                Res = zeros(ds);
        end
    catch
        Res = [];
    end
end

Jos (10584) 2019-2-20

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You want a Sz-by-Sz-by- ... -by-Sz array, where Dims specfies the number of Sz's

Res = zeros(repmat(Sz, 1, D))

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Answer 2

Geoff Hayes 2019-2-20

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Michael - this seems like a homework question so see zeros or ones for how to create a matrix of zeros or ones respectively. And see Declare function name, inputs, and outputs for how to build your function.