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test_equation.py
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#!/usr/bin/env python
##############################################################################
#
# diffpy.srfit by DANSE Diffraction group
# Simon J. L. Billinge
# (c) 2010 The Trustees of Columbia University
# in the City of New York. All rights reserved.
#
# File coded by: Pavol Juhas
#
# See AUTHORS.txt for a list of people who contributed.
# See LICENSE_DANSE.txt for license information.
#
##############################################################################
"""Tests for refinableobj module."""
import unittest
from utils import _makeArgs, noObserversInGlobalBuilders
import diffpy.srfit.equation.literals as literals
from diffpy.srfit.equation import Equation
class TestEquation(unittest.TestCase):
def testSimpleFunction(self):
"""Test a simple function."""
# Make some variables
v1, v2, v3, v4, c = _makeArgs(5)
c.name = "c"
c.const = True
# Make some operations
mult = literals.MultiplicationOperator()
root = mult2 = literals.MultiplicationOperator()
plus = literals.AdditionOperator()
minus = literals.SubtractionOperator()
# Create the equation c*(v1+v3)*(v4-v2)
plus.addLiteral(v1)
plus.addLiteral(v3)
minus.addLiteral(v4)
minus.addLiteral(v2)
mult.addLiteral(plus)
mult.addLiteral(minus)
mult2.addLiteral(mult)
mult2.addLiteral(c)
# Set the values of the variables.
# The equation should evaluate to 2.5*(1+3)*(4-2) = 20
v1.setValue(1)
v2.setValue(2)
v3.setValue(3)
v4.setValue(4)
c.setValue(2.5)
# Make an equation and test
eq = Equation("eq", mult2)
self.assertTrue(eq._value is None)
args = eq.args
self.assertTrue(v1 in args)
self.assertTrue(v2 in args)
self.assertTrue(v3 in args)
self.assertTrue(v4 in args)
self.assertTrue(c not in args)
self.assertTrue(root is eq.root)
self.assertTrue(v1 is eq.v1)
self.assertTrue(v2 is eq.v2)
self.assertTrue(v3 is eq.v3)
self.assertTrue(v4 is eq.v4)
self.assertEqual(20, eq()) # 20 = 2.5*(1+3)*(4-2)
self.assertEqual(20, eq.getValue()) # same as above
self.assertEqual(20, eq.value) # same as above
self.assertEqual(25, eq(v1=2)) # 25 = 2.5*(2+3)*(4-2)
self.assertEqual(50, eq(v2=0)) # 50 = 2.5*(2+3)*(4-0)
self.assertEqual(30, eq(v3=1)) # 30 = 2.5*(2+1)*(4-0)
self.assertEqual(0, eq(v4=0)) # 20 = 2.5*(2+1)*(0-0)
# Try some swapping
eq.swap(v4, v1)
self.assertTrue(eq._value is None)
self.assertEqual(15, eq()) # 15 = 2.5*(2+1)*(2-0)
args = eq.args
self.assertTrue(v4 not in args)
# Try to create a dependency loop
self.assertRaises(ValueError, eq.swap, v1, eq.root)
self.assertRaises(ValueError, eq.swap, v1, plus)
self.assertRaises(ValueError, eq.swap, v1, minus)
self.assertRaises(ValueError, eq.swap, v1, mult)
self.assertRaises(ValueError, eq.swap, v1, root)
# Swap the root
eq.swap(eq.root, v1)
self.assertTrue(eq._value is None)
self.assertEqual(v1.value, eq())
self.assertTrue(noObserversInGlobalBuilders())
return
def testEmbeddedEquation(self):
"""Test a simple function."""
# Make some variables
v1, v2, v3, v4, c = _makeArgs(5)
c.name = "c"
c.const = True
# Make some operations
mult = literals.MultiplicationOperator()
mult2 = literals.MultiplicationOperator()
plus = literals.AdditionOperator()
minus = literals.SubtractionOperator()
# Create the equation c*(v1+v3)*(v4-v2)
plus.addLiteral(v1)
plus.addLiteral(v3)
minus.addLiteral(v4)
minus.addLiteral(v2)
mult.addLiteral(plus)
mult.addLiteral(minus)
mult2.addLiteral(mult)
mult2.addLiteral(c)
# Set the values of the variables.
# The equation should evaluate to 2.5*(1+3)*(4-2) = 20
v1.setValue(1)
v2.setValue(2)
v3.setValue(3)
v4.setValue(4)
c.setValue(2.5)
# Make an equation and test
root = Equation("root", mult2)
eq = Equation("eq", root)
self.assertTrue(eq._value is None)
args = eq.args
self.assertTrue(v1 in args)
self.assertTrue(v2 in args)
self.assertTrue(v3 in args)
self.assertTrue(v4 in args)
self.assertTrue(c not in args)
self.assertTrue(root is eq.root)
self.assertTrue(v1 is eq.v1)
self.assertTrue(v2 is eq.v2)
self.assertTrue(v3 is eq.v3)
self.assertTrue(v4 is eq.v4)
# Make sure the right messages get sent
v1.value = 0
self.assertTrue(root._value is None)
self.assertTrue(eq._value is None)
v1.value = 1
self.assertEqual(20, eq()) # 20 = 2.5*(1+3)*(4-2)
self.assertEqual(20, eq.getValue()) # same as above
self.assertEqual(20, eq.value) # same as above
self.assertEqual(25, eq(v1=2)) # 25 = 2.5*(2+3)*(4-2)
self.assertEqual(50, eq(v2=0)) # 50 = 2.5*(2+3)*(4-0)
self.assertEqual(30, eq(v3=1)) # 30 = 2.5*(2+1)*(4-0)
self.assertEqual(0, eq(v4=0)) # 20 = 2.5*(2+1)*(0-0)
# Try some swapping.
eq.swap(v4, v1)
self.assertTrue(eq._value is None)
self.assertEqual(15, eq()) # 15 = 2.5*(2+1)*(2-0)
args = eq.args
self.assertTrue(v4 not in args)
# Try to create a dependency loop
self.assertRaises(ValueError, eq.swap, v1, eq.root)
self.assertRaises(ValueError, eq.swap, v1, plus)
self.assertRaises(ValueError, eq.swap, v1, minus)
self.assertRaises(ValueError, eq.swap, v1, mult)
self.assertRaises(ValueError, eq.swap, v1, root)
# Swap the root
eq.swap(eq.root, v1)
self.assertTrue(eq._value is None)
self.assertEqual(v1.value, eq())
self.assertTrue(noObserversInGlobalBuilders())
return
if __name__ == "__main__":
unittest.main()