Meaning of 10j in SciPy

Question

What is the meaning of 10j in b = np.r_[3,[0]*5,-1:1:10j] ?

Answer 1

10j in b = np.r_[3,[0]*5,-1:1:10j] means that the step value is imaginary. So here, the slicing starts from -1, upto 1 and the step size is 10j (start:stop:stepj). The value of 10j here is:

((1-(-1)) / 9)= 2 / 9= 0.2222222...

So if you print b, you will see the output to be as follows:

array([ 3.        ,  0.        ,  0.        ,  0.        ,  0.        ,
        0.        , -1.        , -0.77777778, -0.55555556, -0.33333333,
       -0.11111111,  0.11111111,  0.33333333,  0.55555556,  0.77777778,
        1.        ])