I'm trying to implement this code with numba, but don't understand why it's not compiling in nopython mode.

def mult(x,y):
    ran = len(x)
    for i in range(ran):
        y[i,:] = x[i]*y[i,:]
    return y

The error is: typing error non-precise type pyobject

x is a matrix of form (n) and y (n,m) with dtype 'f4'.