negative number in vector

say I have a vector v=[1 2 5 6 -8 5 2 7]

and I to create a new vector that has all the elements until the negative number shows up

such as c=[1 2 5 6]

how would you do this without using a while loop

Answer 1

[madhan ravi]

c=v(1:find(v<0,1,'first')-1)