concatenate, vstack, hstack accepting scalars.py

# modified numpy concatenate, vstack, hstack accepting scalars in the input tuple

def concatenate(tup, axis=0):
    tup_arrays = [x for x in tup if isinstance(x, np.ndarray)]
    shape = list(tup_arrays[0].shape)
    shape[axis] = 1

    tup_ = []    
    for x in tup:
        if isinstance(x, (int, long, float)):
            tup_.append(np.ones(shape) * x)
        else:
            tup_.append(x)

    return np.concatenate(tup_, axis=axis)

def vstack(tup):
    return concatenate(tup, 0)
    
def hstack(tup):
    return concatenate(tup, 1)