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''' Some tests for filters '''
import numpy as np
from numpy.testing import assert_equal, assert_raises
from nose.tools import assert_true
import scipy.ndimage as sndi
def test_ticket_701():
# Test generic filter sizes
arr = np.arange(4).reshape((2,2))
func = lambda x: np.min(x)
res = sndi.generic_filter(arr, func, size=(1,1))
# The following raises an error unless ticket 701 is fixed
res2 = sndi.generic_filter(arr, func, size=1)
assert_equal(res, res2)
def test_orders_gauss():
# Check order inputs to Gaussians
arr = np.zeros((1,))
yield assert_equal, 0, sndi.gaussian_filter(arr, 1, order=0)
yield assert_equal, 0, sndi.gaussian_filter(arr, 1, order=3)
yield assert_raises, ValueError, sndi.gaussian_filter, arr, 1, -1
yield assert_raises, ValueError, sndi.gaussian_filter, arr, 1, 4
yield assert_equal, 0, sndi.gaussian_filter1d(arr, 1, axis=-1, order=0)
yield assert_equal, 0, sndi.gaussian_filter1d(arr, 1, axis=-1, order=3)
yield assert_raises, ValueError, sndi.gaussian_filter1d, arr, 1, -1, -1
yield assert_raises, ValueError, sndi.gaussian_filter1d, arr, 1, -1, 4
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