public void ExecuteTest6()
{
var exp = new Sub(new Number(2), new Sqrt(new Number(-9)));
var expected = new Complex(2, -3);
Assert.Equal(expected, exp.Execute());
}
public void EqualsTest2()
{
var add = new Add(new Number(2), new Number(3));
var sub = new Sub(new Number(2), new Number(3));
Assert.AreNotEqual(add, sub);
}
public void ExecuteTest3()
{
var exp = new Sub(new Number(7), new ComplexNumber(2, 4));
var expected = new Complex(5, -4);
Assert.Equal(expected, exp.Execute());
}
public void EqualsTest2()
{
var add = new Add(new Number(2), new Number(3));
var sub = new Sub(new Number(2), new Number(3));
Assert.NotEqual<IExpression>(add, sub);
}
public void ExecuteTest4()
{
var exp = new Sub(new ComplexNumber(7, 3), new Number(2));
var expected = new Complex(5, 3);
Assert.Equal(expected, exp.Execute());
}
public void DerivativeTest1()
{
// x - sin(x)
IExpression exp = new Sub(new Variable("x"), new Sin(new Variable("x")));
IExpression deriv = exp.Differentiate();
Assert.AreEqual("1 - (cos(x) * 1)", deriv.ToString());
}
public void AddDiffNum_NumSubVar_()
{
// 2 + (2 - x)
var add = new Add(new Number(2), new Sub(new Number(2), new Variable("x")));
var expected = new Sub(new Number(4), new Variable("x"));
SimpleTest(add, expected);
}
public void SubTwoVectorsTest()
{
var vector1 = new Vector(new[] { new Number(2), new Number(3) });
var vector2 = new Vector(new[] { new Number(7), new Number(1) });
var sub = new Sub(vector1, vector2);
var expected = new Vector(new[] { new Number(-5), new Number(2) });
var result = sub.Calculate();
Assert.AreEqual(expected, result);
}
public void DerivativeTest2()
{
Number num1 = new Number(2);
Variable x = new Variable("x");
Mul mul1 = new Mul(num1, x);
Number num2 = new Number(3);
Mul mul2 = new Mul(num2, x.Clone());
IExpression exp = new Sub(mul1, mul2);
IExpression deriv = exp.Differentiate();
Assert.AreEqual("(2 * 1) - (3 * 1)", deriv.ToString());
num1.Value = 5;
num2.Value = 4;
Assert.AreEqual("(5 * x) - (4 * x)", exp.ToString());
Assert.AreEqual("(2 * 1) - (3 * 1)", deriv.ToString());
}
public void SubTwoMatricesTest()
{
var matrix1 = new Matrix(new[]
{
new Vector(new[] { new Number(6), new Number(3) }),
new Vector(new[] { new Number(2), new Number(1) })
});
var matrix2 = new Matrix(new[]
{
new Vector(new[] { new Number(9), new Number(2) }),
new Vector(new[] { new Number(4), new Number(3) })
});
var sub = new Sub(matrix1, matrix2);
var expected = new Matrix(new[]
{
new Vector(new[] { new Number(-3), new Number(1) }),
new Vector(new[] { new Number(-2), new Number(-2) })
});
var result = sub.Calculate();
Assert.AreEqual(expected, result);
}
public void SubSecondZero()
{
var sub = new Sub(new Variable("x"), new Number(0));
var expected = new Variable("x");
SimpleTest(sub, expected);
}
public void SubSameVars9()
{
// (x * 3) - (x * 2)
var x = new Variable("x");
var sub = new Sub(new Mul(x, new Number(3)), new Mul(x, new Number(2)));
var expected = x;
SimpleTest(sub, expected);
}
public void SubSecondUnaryMinus()
{
var sub = new Sub(new Number(2), new UnaryMinus(new Variable("x")));
var expected = new Add(new Number(2), new Variable("x"));
SimpleTest(sub, expected);
}
public void SubSameVars5()
{
// x - (x * 2)
var x = new Variable("x");
var sub = new Sub(x, new Mul(x, new Number(2)));
var expected = new UnaryMinus(x);
SimpleTest(sub, expected);
}
public void SubSameVars8()
{
// 3x - 2x
var x = new Variable("x");
var sub = new Sub(new Mul(new Number(3), x), new Mul(new Number(2), x));
var expected = x;
SimpleTest(sub, expected);
}
public void SubSameVars10()
{
// (x * 4) - (x * 2)
var x = new Variable("x");
var sub = new Sub(new Mul(x, new Number(4)), new Mul(x, new Number(2)));
var expected = new Mul(new Number(2), x);
SimpleTest(sub, expected);
}
public void SubSameVars2()
{
// (x - x) - x
var x = new Variable("x");
var sub = new Sub(new Sub(x, x), x);
var expected = new UnaryMinus(x);
SimpleTest(sub, expected);
}
private IExpression SimplifySub(Sub sub)
{
// sub zero
if (sub.Left.Equals(zero))
return _Simplify(new UnaryMinus(sub.Right));
if (sub.Right.Equals(zero))
return sub.Left;
if (sub.Left is Number && sub.Right is Number)
return new Number((double)sub.Calculate());
if (sub.Right is UnaryMinus)
{
var unMinus = sub.Right as UnaryMinus;
var add = new Add(sub.Left, unMinus.Argument);
return add;
}
// (2 + x) - 2
// (x + 2) - 2
if (sub.Left is Add && sub.Right is Number)
{
var bracketAdd = sub.Left as Add;
var firstNumber = sub.Right as Number;
if (bracketAdd.Left is Number)
{
var secondNumber = bracketAdd.Left as Number;
var result = new Add(bracketAdd.Right, new Number((double)firstNumber.Calculate() - (double)secondNumber.Calculate()));
return _Simplify(result);
}
if (bracketAdd.Right is Number)
{
var secondNumber = bracketAdd.Right as Number;
var result = new Add(bracketAdd.Left, new Number((double)firstNumber.Calculate() - (double)secondNumber.Calculate()));
return _Simplify(result);
}
}
// 2 - (2 + x)
// 2 - (x + 2)
else if (sub.Right is Add && sub.Left is Number)
{
var bracketAdd = sub.Right as Add;
var firstNumber = sub.Left as Number;
if (bracketAdd.Left is Number)
{
var secondNumber = bracketAdd.Left as Number;
var result = new Sub(new Number((double)firstNumber.Calculate() - (double)secondNumber.Calculate()), bracketAdd.Right);
return _Simplify(result);
}
if (bracketAdd.Right is Number)
{
var secondNumber = bracketAdd.Right as Number;
var result = new Sub(new Number((double)firstNumber.Calculate() - (double)secondNumber.Calculate()), bracketAdd.Left);
return _Simplify(result);
}
}
// (2 - x) - 2
// (x - 2) - 2
else if (sub.Left is Sub && sub.Right is Number)
{
var bracketSub = sub.Left as Sub;
var firstNumber = sub.Right as Number;
if (bracketSub.Left is Number)
{
var secondNumber = bracketSub.Left as Number;
var result = new Sub(new Number((double)firstNumber.Calculate() - (double)secondNumber.Calculate()), bracketSub.Right);
return _Simplify(result);
}
if (bracketSub.Right is Number)
{
var secondNumber = bracketSub.Right as Number;
var result = new Sub(bracketSub.Left, new Number((double)firstNumber.Calculate() + (double)secondNumber.Calculate()));
return _Simplify(result);
}
}
// 2 - (2 - x)
// 2 - (x - 2)
else if (sub.Right is Sub && sub.Left is Number)
{
var bracketSub = sub.Right as Sub;
var firstNumber = sub.Left as Number;
if (bracketSub.Left is Number)
{
var secondNumber = bracketSub.Left as Number;
var result = new Add(new Number((double)firstNumber.Calculate() - (double)secondNumber.Calculate()), bracketSub.Right);
return _Simplify(result);
}
if (bracketSub.Right is Number)
{
var secondNumber = bracketSub.Right as Number;
var result = new Sub(new Number((double)firstNumber.Calculate() + (double)secondNumber.Calculate()), bracketSub.Left);
return _Simplify(result);
}
}
return sub;
}
public void SubSameVars1()
{
// x - x
var sub = new Sub(new Variable("x"), new Variable("x"));
var expected = new Number(0);
SimpleTest(sub, expected);
}
private IExpression SimplifyAdd(Add add)
{
// plus zero
if (add.Left.Equals(zero))
return add.Right;
if (add.Right.Equals(zero))
return add.Left;
if (add.Left is Number && add.Right is Number)
return new Number((double)add.Calculate());
if (add.Left is UnaryMinus)
{
IExpression temp = add.Left;
add.Left = add.Right;
add.Right = temp;
}
if (add.Right is UnaryMinus)
{
var unMinus = add.Right as UnaryMinus;
var sub = new Sub(add.Left, unMinus.Argument);
return sub;
}
// 2 + (2 + x)
// 2 + (x + 2)
// (2 + x) + 2
// (x + 2) + 2
Add bracketAdd = null;
Number firstNumber = null;
if (add.Left is Add && add.Right is Number)
{
bracketAdd = add.Left as Add;
firstNumber = add.Right as Number;
}
else if (add.Right is Add && add.Left is Number)
{
bracketAdd = add.Right as Add;
firstNumber = add.Left as Number;
}
if (bracketAdd != null)
{
if (bracketAdd.Left is Number)
{
var secondNumber = bracketAdd.Left as Number;
var result = new Add(bracketAdd.Right, new Number(firstNumber.Value + secondNumber.Value));
return _Simplify(result);
}
if (bracketAdd.Right is Number)
{
var secondNumber = bracketAdd.Right as Number;
var result = new Add(bracketAdd.Left, new Number(firstNumber.Value + secondNumber.Value));
return _Simplify(result);
}
}
// 2 + (2 - x)
// 2 + (x - 2)
// (2 - x) + 2
// (x - 2) + 2
Sub bracketSub = null;
if (add.Left is Sub && add.Right is Number)
{
bracketSub = add.Left as Sub;
firstNumber = add.Right as Number;
}
else if (add.Right is Sub && add.Left is Number)
{
bracketSub = add.Right as Sub;
firstNumber = add.Left as Number;
}
if (bracketSub != null)
{
if (bracketSub.Left is Number)
{
var secondNumber = bracketSub.Left as Number;
var result = new Sub(new Number(firstNumber.Value + secondNumber.Value), bracketSub.Right);
return _Simplify(result);
}
if (bracketSub.Right is Number)
{
var secondNumber = bracketSub.Right as Number;
var result = new Add(new Number(firstNumber.Value - secondNumber.Value), bracketSub.Left);
return _Simplify(result);
}
}
return add;
}
public void SubTwoNumbers()
{
var sub = new Sub(new Number(3), new Number(2));
var expected = new Number(1);
SimpleTest(sub, expected);
}
public void SubDiff_NumSubVar_SubNum()
{
var sub = new Sub(new Sub(new Number(2), new Variable("x")), new Number(2));
var expected = new UnaryMinus(new Variable("x"));
SimpleTest(sub, expected);
}
public void SubDiff_NumAddVar_SubNum()
{
// (2 + x) - 2
var sub = new Sub(new Add(new Number(2), new Variable("x")), new Number(2));
var expected = new Variable("x");
SimpleTest(sub, expected);
}
public void SubDiffNumSub_VarAddNum_()
{
// 2 - (x + 2)
var sub = new Sub(new Number(2), new Add(new Variable("x"), new Number(2)));
var expected = new UnaryMinus(new Variable("x"));
SimpleTest(sub, expected);
}
public void SubDiffNumSub_NumSubVar_()
{
var sub = new Sub(new Number(2), new Sub(new Number(2), new Variable("x")));
var expected = new Variable("x");
SimpleTest(sub, expected);
}
public void AddDiff_NumSubVar_AddNum()
{
// (2 - x) + 2
var add = new Add(new Sub(new Number(2), new Variable("x")), new Number(2));
var expected = new Sub(new Number(4), new Variable("x"));
SimpleTest(add, expected);
}
public void AddSecondUnaryMinus()
{
var add = new Add(new Number(2), new UnaryMinus(new Variable("x")));
var expected = new Sub(new Number(2), new Variable("x"));
SimpleTest(add, expected);
}
public void SubFirstZero()
{
var sub = new Sub(new Number(0), new Variable("x"));
var expected = new UnaryMinus(new Variable("x"));
SimpleTest(sub, expected);
}
public void SubDiff_VarAddNum_SubNum()
{
// (x + 2) - 2
var sub = new Sub(new Add(new Variable("x"), new Number(2)), new Number(2));
var expected = new Variable("x");
SimpleTest(sub, expected);
}
public void SubDiff_VarSubNum_SubNum()
{
var sub = new Sub(new Sub(new Variable("x"), new Number(2)), new Number(2));
var expected = new Sub(new Variable("x"), new Number(4));
SimpleTest(sub, expected);
}
