assign empty vector to an element of a vector in a for loop

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Shan Chu 2019-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/466371-assign-empty-vector-to-an-element-of-a-vector-in-a-for-loop

评论： Star Strider 2019-6-10

采纳的回答： Star Strider

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Hi everyone,

I created a 'for' loop with 'solve'

for i0=1:1:length(sig)
    syms r
    r0(i0)=double(solve(function_of_r,r));
end

At some points, the 'solve' function returns '0×1 empty double column vector' (which is correct).

But then, Matlab returns an error 'Unable to perform assignment because the left and right sides have a different number of elements.' because of the empty vector.

I understood the problem but is there any way to assign that empty vector to an element of another vector?

I would like to have the vector in the form like r=[1, 3 , 4 ,[], [], [],..., 5, 7,9]

Thanks

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Answer 1

Star Strider 2019-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/466371-assign-empty-vector-to-an-element-of-a-vector-in-a-for-loop#answer_378580

在 MATLAB Online 中打开

One option could be to assign it instead as a cell array:

r0{i0} = ..

.Note the curly brackets {}.

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Shan Chu 2019-6-10

Thanks sir, It's what I need

Star Strider 2019-6-10

As always, my pleasure!

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assign empty vector to an element of a vector in a for loop

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