# How to create null vector Matlab

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Afluo Raoual on 18 Feb 2021
Commented: Just Manuel on 18 Feb 2021
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.
##### 3 CommentsShow 1 older commentHide 1 older comment
Afluo Raoual on 18 Feb 2021
I get an unexpected result which is:
1*0 empty double row vector
Just Manuel on 18 Feb 2021
Yep, then go with Bjorn Gustavsson's answer.
Cheers
Manuel

Bjorn Gustavsson on 18 Feb 2021
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
Afluo Raoual on 18 Feb 2021
It's done. Thank you :)
Just Manuel on 18 Feb 2021
You're welcome.

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