Vectorized NumPy linspace across multi-dimensional arrays

Question

Say I have 2 numpy 2D arrays, mins, and maxs, that will always be the same dimension as one another. I\'d like to create a third array, results, that is the result of apply

Answer 1

Here's one vectorized approach based on this post to cover for generic n-dim cases -

def create_ranges_nd(start, stop, N, endpoint=True):
    if endpoint==1:
        divisor = N-1
    else:
        divisor = N
    steps = (1.0/divisor) * (stop - start)
    return start[...,None] + steps[...,None]*np.arange(N)

Sample run -

In [536]: mins = np.array([[3,5],[2,4]])

In [537]: maxs = np.array([[13,16],[11,12]])

In [538]: create_ranges_nd(mins, maxs, 6)
Out[538]: 
array([[[  3. ,   5. ,   7. ,   9. ,  11. ,  13. ],
        [  5. ,   7.2,   9.4,  11.6,  13.8,  16. ]],

       [[  2. ,   3.8,   5.6,   7.4,   9.2,  11. ],
        [  4. ,   5.6,   7.2,   8.8,  10.4,  12. ]]])

Answer 2

As of Numpy version 1.16.0, non-scalar start and stop are now supported.

So, now you can do this:

assert np.__version__ > '1.17.2'

mins = np.random.rand(2,2)
maxs = np.random.rand(2,2)

# Number of elements in the linspace
x = 3

results = np.linspace(mins, maxs, num=x)

# And, if required
results = np.rollaxis(results, 0, 3)