Finding and deleting negative values

I'm having trouble deleting negative values from a vector (vi) I wish to as an index:

vi =[-14:1:16];

I wrote this script:

l=length(vi); for i=1:l; while vi(i)<1; vi(i)=[]; break end end

Somehow, this only deletes the non-positive even numbered values in the matrix, not the negative ones (i.e. -14, -12, -10... disappear, but not -13, -11, -9)

Does anybody know why and can fix it for me?

Answer 1

[Nellikin]

found it: vi(vi<=0)=[];