How to plot impulses at particular locations using find command in MATLAB .?

For example, I have x=[2 0 5 0 5 0 8 5 5 8 5 5 0 5 0 5 0 5 0 5 0 8 4 0 5]; index=find(x~=0); x(index)=1;

After this, I have the x=[1 0 1 0 1 0 1 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 1 0 1],

Now how to plot impulses at locations of 1 value using plot ?