[julia-users] Function to get Index of nonzero entries in sparse vector

[JVaz]

Hello,
I have a sparse vector, is there any function that returns an array with 
the index of its nonzero entires?

E.g I have

A 

1048576x1 sparse matrix with 2 Float64 entries:
        [1      ,       1]  =  0.5
        [32801  ,       1]  =  0.5


I want a function(A) --> [1,32801]


Thanks!

(I thought this wold be basic, but I couldn't find info in the documentation or 
the forums, sorry if I missed it)