I have an array where I record hits
 a=np.zeros(5) 
and an array with the indices of the hits, for example I have 2 hits on index 2
 hits=np.array([2,2]) 
so I want to increase index 2 of a by 2

I tried:
 a[hits]+=1 
but it gives array([ 0., 0., 1., 0., 0.])
does someone have a suggestion?
 bins=np.bincount(hits) a[:len(bins)] += bins a array([ 0., 0., 2., 0., 0.])