Finding and deleting negative values

2012 2 14
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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?

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