Why creating a float32 array from a list raises value error?

Question

I'm trying to create a float32 array as follows,

np.float32([kp2, kp2+dir_v*dist, kp2 + dir_v_r*dist])

However, I'm getting the following error,

ValueError: setting an array element with a sequence.

I tried to cast it to numpy array explicitly as follows and retry but still, I'm getting the same error

np.array([kp2, kp2+dir_v*dist, kp2 + dir_v_r*dist]).astype(float)

what am I missing?

Answer 1

Specify the datatype with the dtype argument to np.array().

np.array([kp2, kp2+dir_v*dist, kp2 + dir_v_r*dist], dtype=float)