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# This testfile tests SymPy <-> NumPy compatibility
# Don't test any SymPy features here. Just pure interaction with NumPy.
# Always write regular SymPy tests for anything, that can be tested in pure
# Python (without numpy). Here we test everything, that a user may need when
# using SymPy with NumPy
from __future__ import division
from sympy.external import import_module
numpy = import_module('numpy')
if numpy:
array, matrix, ndarray = numpy.array, numpy.matrix, numpy.ndarray
else:
#bin/test will not execute any tests now
disabled = True
def setup_module(module):
"""py.test support"""
if getattr(module, 'disabled', False):
import pytest
pytest.skip("numpy isn't available.")
from sympy import (Rational, Symbol, list2numpy, sin, Float, Matrix, lambdify,
symarray, symbols, Integer)
import sympy
import mpmath
from sympy.abc import x, y, z
from sympy.utilities.decorator import conserve_mpmath_dps
# first, systematically check, that all operations are implemented and don't
# raise an exception
def test_systematic_basic():
def s(sympy_object, numpy_array):
x = sympy_object + numpy_array
x = numpy_array + sympy_object
x = sympy_object - numpy_array
x = numpy_array - sympy_object
x = sympy_object * numpy_array
x = numpy_array * sympy_object
x = sympy_object / numpy_array
x = numpy_array / sympy_object
x = sympy_object ** numpy_array
x = numpy_array ** sympy_object
x = Symbol("x")
y = Symbol("y")
sympy_objs = [
Rational(2, 3),
Float("1.3"),
x,
y,
pow(x, y)*y,
Integer(5),
Float(5.5),
]
numpy_objs = [
array([1]),
array([3, 8, -1]),
array([x, x**2, Rational(5)]),
array([x/y*sin(y), 5, Rational(5)]),
]
for x in sympy_objs:
for y in numpy_objs:
s(x, y)
# now some random tests, that test particular problems and that also
# check that the results of the operations are correct
def test_basics():
one = Rational(1)
zero = Rational(0)
assert array(1) == array(one)
assert array([one]) == array([one])
assert array([x]) == array([x])
assert array(x) == array(Symbol("x"))
assert array(one + x) == array(1 + x)
X = array([one, zero, zero])
assert (X == array([one, zero, zero])).all()
assert (X == array([one, 0, 0])).all()
def test_arrays():
one = Rational(1)
zero = Rational(0)
X = array([one, zero, zero])
Y = one*X
X = array([Symbol("a") + Rational(1, 2)])
Y = X + X
assert Y == array([1 + 2*Symbol("a")])
Y = Y + 1
assert Y == array([2 + 2*Symbol("a")])
Y = X - X
assert Y == array([0])
def test_conversion1():
a = list2numpy([x**2, x])
#looks like an array?
assert isinstance(a, ndarray)
assert a[0] == x**2
assert a[1] == x
assert len(a) == 2
#yes, it's the array
def test_conversion2():
a = 2*list2numpy([x**2, x])
b = list2numpy([2*x**2, 2*x])
assert (a == b).all()
one = Rational(1)
zero = Rational(0)
X = list2numpy([one, zero, zero])
Y = one*X
X = list2numpy([Symbol("a") + Rational(1, 2)])
Y = X + X
assert Y == array([1 + 2*Symbol("a")])
Y = Y + 1
assert Y == array([2 + 2*Symbol("a")])
Y = X - X
assert Y == array([0])
def test_list2numpy():
assert (array([x**2, x]) == list2numpy([x**2, x])).all()
def test_Matrix1():
m = Matrix([[x, x**2], [5, 2/x]])
assert (array(m.subs(x, 2)) == array([[2, 4], [5, 1]])).all()
m = Matrix([[sin(x), x**2], [5, 2/x]])
assert (array(m.subs(x, 2)) == array([[sin(2), 4], [5, 1]])).all()
def test_Matrix2():
m = Matrix([[x, x**2], [5, 2/x]])
assert (matrix(m.subs(x, 2)) == matrix([[2, 4], [5, 1]])).all()
m = Matrix([[sin(x), x**2], [5, 2/x]])
assert (matrix(m.subs(x, 2)) == matrix([[sin(2), 4], [5, 1]])).all()
def test_Matrix3():
a = array([[2, 4], [5, 1]])
assert Matrix(a) == Matrix([[2, 4], [5, 1]])
assert Matrix(a) != Matrix([[2, 4], [5, 2]])
a = array([[sin(2), 4], [5, 1]])
assert Matrix(a) == Matrix([[sin(2), 4], [5, 1]])
assert Matrix(a) != Matrix([[sin(0), 4], [5, 1]])
def test_Matrix4():
a = matrix([[2, 4], [5, 1]])
assert Matrix(a) == Matrix([[2, 4], [5, 1]])
assert Matrix(a) != Matrix([[2, 4], [5, 2]])
a = matrix([[sin(2), 4], [5, 1]])
assert Matrix(a) == Matrix([[sin(2), 4], [5, 1]])
assert Matrix(a) != Matrix([[sin(0), 4], [5, 1]])
def test_Matrix_sum():
M = Matrix([[1, 2, 3], [x, y, x], [2*y, -50, z*x]])
m = matrix([[2, 3, 4], [x, 5, 6], [x, y, z**2]])
assert M + m == Matrix([[3, 5, 7], [2*x, y + 5, x + 6], [2*y + x, y - 50, z*x + z**2]])
assert m + M == Matrix([[3, 5, 7], [2*x, y + 5, x + 6], [2*y + x, y - 50, z*x + z**2]])
assert M + m == M.add(m)
def test_Matrix_mul():
M = Matrix([[1, 2, 3], [x, y, x]])
m = matrix([[2, 4], [x, 6], [x, z**2]])
assert M*m == Matrix([
[ 2 + 5*x, 16 + 3*z**2],
[2*x + x*y + x**2, 4*x + 6*y + x*z**2],
])
assert m*M == Matrix([
[ 2 + 4*x, 4 + 4*y, 6 + 4*x],
[ 7*x, 2*x + 6*y, 9*x],
[x + x*z**2, 2*x + y*z**2, 3*x + x*z**2],
])
a = array([2])
assert a[0] * M == 2 * M
assert M * a[0] == 2 * M
def test_Matrix_array():
class matarray(object):
def __array__(self):
from numpy import array
return array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
matarr = matarray()
assert Matrix(matarr) == Matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
def test_issue629():
assert (Rational(1, 2)*array([2*x, 0]) == array([x, 0])).all()
assert (Rational(1, 2) + array(
[2*x, 0]) == array([2*x + Rational(1, 2), Rational(1, 2)])).all()
assert (Float("0.5")*array([2*x, 0]) == array([Float("1.0")*x, 0])).all()
assert (Float("0.5") + array(
[2*x, 0]) == array([2*x + Float("0.5"), Float("0.5")])).all()
@conserve_mpmath_dps
def test_lambdify():
mpmath.mp.dps = 16
sin02 = mpmath.mpf("0.198669330795061215459412627")
f = lambdify(x, sin(x), "numpy")
prec = 1e-15
assert -prec < f(0.2) - sin02 < prec
try:
f(x) # if this succeeds, it can't be a numpy function
assert False
except AttributeError:
pass
def test_lambdify_matrix():
f = lambdify(x, Matrix([[x, 2*x], [1, 2]]), "numpy")
assert (f(1) == matrix([[1, 2], [1, 2]])).all()
def test_lambdify_matrix_multi_input():
M = sympy.Matrix([[x**2, x*y, x*z],
[y*x, y**2, y*z],
[z*x, z*y, z**2]])
f = lambdify((x, y, z), M, "numpy")
xh, yh, zh = 1.0, 2.0, 3.0
expected = matrix([[xh**2, xh*yh, xh*zh],
[yh*xh, yh**2, yh*zh],
[zh*xh, zh*yh, zh**2]])
actual = f(xh, yh, zh)
assert numpy.allclose(actual, expected)
def test_lambdify_matrix_vec_input():
X = sympy.DeferredVector('X')
M = Matrix([
[X[0]**2, X[0]*X[1], X[0]*X[2]],
[X[1]*X[0], X[1]**2, X[1]*X[2]],
[X[2]*X[0], X[2]*X[1], X[2]**2]])
f = lambdify(X, M, "numpy")
Xh = array([1.0, 2.0, 3.0])
expected = matrix([[Xh[0]**2, Xh[0]*Xh[1], Xh[0]*Xh[2]],
[Xh[1]*Xh[0], Xh[1]**2, Xh[1]*Xh[2]],
[Xh[2]*Xh[0], Xh[2]*Xh[1], Xh[2]**2]])
actual = f(Xh)
assert numpy.allclose(actual, expected)
def test_lambdify_transl():
from sympy.utilities.lambdify import NUMPY_TRANSLATIONS
for sym, mat in NUMPY_TRANSLATIONS.items():
assert sym in sympy.__dict__
assert mat in numpy.__dict__
def test_symarray():
"""Test creation of numpy arrays of sympy symbols."""
import numpy as np
import numpy.testing as npt
syms = symbols('_0,_1,_2')
s1 = symarray("", 3)
s2 = symarray("", 3)
npt.assert_array_equal(s1, np.array(syms, dtype=object))
assert s1[0] == s2[0]
a = symarray('a', 3)
b = symarray('b', 3)
assert not(a[0] == b[0])
asyms = symbols('a_0,a_1,a_2')
npt.assert_array_equal(a, np.array(asyms, dtype=object))
# Multidimensional checks
a2d = symarray('a', (2, 3))
assert a2d.shape == (2, 3)
a00, a12 = symbols('a_0_0,a_1_2')
assert a2d[0, 0] == a00
assert a2d[1, 2] == a12
a3d = symarray('a', (2, 3, 2))
assert a3d.shape == (2, 3, 2)
a000, a120, a121 = symbols('a_0_0_0,a_1_2_0,a_1_2_1')
assert a3d[0, 0, 0] == a000
assert a3d[1, 2, 0] == a120
assert a3d[1, 2, 1] == a121
def test_vectorize():
assert (numpy.vectorize(
sin)([1, 2, 3]) == numpy.array([sin(1), sin(2), sin(3)])).all()
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