How to create null vector Matlab

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Afluo Raoual 2021-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/749172-how-to-create-null-vector-matlab

评论： Just Manuel 2021-2-18

采纳的回答： Bjorn Gustavsson

Dear members

I have matrix with size M*N and vector with size 1*K

I want to create a null vector with length of N - length of K

I tried this :

V=zeros(1,length(N)-length(K));

but it doesn't work. Any solution please ?

Thank you.

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Afluo Raoual 2021-2-18

I get an unexpected result which is:

1*0 empty double row vector

Just Manuel 2021-2-18

Yep, then go with Bjorn Gustavsson's answer.

Cheers

Manuel

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采纳的回答

Bjorn Gustavsson 2021-2-18

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First off if you've done something like:

N = 12;
M = 14;
K = 7;
Mtr = randn(M,N);
V = rand(1,K);
V=zeros(1,length(N)-length(K));

Then you only check the length of the 1-by-1 arrays N and K - and the difference of that is zero. If your N and K are your arrays you might have run into a situation where N < K, because this also happens when N < K. Perhaps you've mixed up the dimensions of your matrix and you meant to make something like this:

V=zeros(1,M - K);

HTH

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Afluo Raoual 2021-2-18

It's done. Thank you :)

Just Manuel 2021-2-18

You're welcome.

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