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""" test_function.py
Tests the PieceWiseConst and PieceWiseLinear functions
Copyright 2014, Mario Mulansky <mario.mulansky@gmx.net>
"""
from __future__ import print_function
import numpy as np
from copy import copy
from numpy.testing import assert_equal, assert_almost_equal, \
assert_array_almost_equal
import pyspike as spk
def test_pwc():
# some random data
x = [0.0, 1.0, 2.0, 2.5, 4.0]
y = [1.0, -0.5, 1.5, 0.75]
f = spk.PieceWiseConstFunc(x, y)
xp, yp = f.get_plottable_data()
xp_expected = [0.0, 1.0, 1.0, 2.0, 2.0, 2.5, 2.5, 4.0]
yp_expected = [1.0, 1.0, -0.5, -0.5, 1.5, 1.5, 0.75, 0.75]
assert_array_almost_equal(xp, xp_expected)
assert_array_almost_equal(yp, yp_expected)
assert_almost_equal(f.avrg(), (1.0-0.5+0.5*1.5+1.5*0.75)/4.0, decimal=16)
assert_almost_equal(f.abs_avrg(), (1.0+0.5+0.5*1.5+1.5*0.75)/4.0,
decimal=16)
f1 = copy(f)
x = [0.0, 0.75, 2.0, 2.5, 2.7, 4.0]
y = [0.5, 1.0, -0.25, 0.0, 1.5]
f2 = spk.PieceWiseConstFunc(x, y)
f1.add(f2)
x_expected = [0.0, 0.75, 1.0, 2.0, 2.5, 2.7, 4.0]
y_expected = [1.5, 2.0, 0.5, 1.25, 0.75, 2.25]
assert_array_almost_equal(f1.x, x_expected, decimal=16)
assert_array_almost_equal(f1.y, y_expected, decimal=16)
f2.add(f)
assert_array_almost_equal(f2.x, x_expected, decimal=16)
assert_array_almost_equal(f2.y, y_expected, decimal=16)
f1.add(f2)
# same x, but y doubled
assert_array_almost_equal(f1.x, f2.x, decimal=16)
assert_array_almost_equal(f1.y, 2*f2.y, decimal=16)
if __name__ == "__main__":
test_pwc()
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