Extracting zeros from vectors

I need to extract zeros from a vector while keeping the same order of elements in s.

Like this :

S=[1 0 0 2 3 0 0 0 2 1 0 4 0 0 0 0 1 0 2]

S1=[1 2 3 2 1 4 1 2]

Answer 1

[madhan ravi]

>> S=[1 0 0 2 3 0 0 0 2 1 0 4 0 0 0 0 1 0 2]
   S =nonzeros(S)'

S =

    Columns 1 through 13

       1     0     0     2     3     0     0     0     2     1     0     4     0

    Columns 14 through 19

       0     0     0     1     0     2

S =

       1     2     3     2     1     4     1     2

>>

[madhan ravi]

if this is not what you are looking for let know

Answer 2

[Andrei Bobrov]

S1 = S(S ~= 0)