public CompiledFuncTest()
{
multiFuncNotCompiled = (MathS.Log(3, x) + MathS.Sqr(x)) * MathS.Sin(x + MathS.Cosec(x));
multiFunc = multiFuncNotCompiled.Compile(x);
Expression <Func <Complex, Complex> > expr = x => (Complex.Log(x, 3) + Complex.Pow(x, 2)) * Complex.Sin(x + 1 / Complex.Sin(x));
linqFunc = expr.Compile();
}
[TestMethod] public void SetSimplify() => Test(@"\left\{\log_{2}\left(4\right)\right\}", new Set(MathS.Log(2, 4), MathS.Sqrt(MathS.Sqrt(16))));
[TestMethod] public void Log() => Test(@"\log_{2}\left(10\right)", MathS.Log(2, 10));
[TestMethod] public void LnAlternate() => Test(@"\ln\left(10\right)", MathS.Log(MathS.e, 10));
[TestMethod] public void Log10() => Test(@"\log\left(10\right)", MathS.Log(10, 10));
/// <summary>
/// Inverts operator and returns a set
/// x^2 = a
/// => x = sqrt(a)
/// x = -sqrt(a)
/// </summary>
/// <param name="func"></param>
/// <param name="value"></param>
/// <param name="x"></param>
/// <returns></returns>
public static Set InvertOperatorEntity(OperatorEntity func, Entity value, Entity x)
{
Entity a, un;
int arg;
if (func.Children[0].FindSubtree(x) != null)
{
a = func.Children[1];
un = func.Children[0];
arg = 0;
}
else
{
a = func.Children[0];
un = func.Children[1];
arg = 1;
}
var n = Utils.FindNextIndex(func + value, "n");
switch (func.Name)
{
case "sumf":
// x + a = value => x = value - a
return(FindInvertExpression(un, value - a, x));
case "minusf":
if (arg == 0)
{
// x - a = value => x = value + a
return(FindInvertExpression(un, value + a, x));
}
else
{
// a - x = value => x = a - value
return(FindInvertExpression(un, a - value, x));
}
case "mulf":
// x * a = value => x = value / a
return(FindInvertExpression(un, value / a, x));
case "divf":
if (arg == 0)
{
// x / a = value => x = a * value
return(FindInvertExpression(un, value * a, x));
}
else
{
// a / x = value => x = a / value
return(FindInvertExpression(un, a / value, x));
}
case "powf":
if (arg == 0)
{
// x ^ a = value => x = value ^ (1/a)
if (a.entType == Entity.EntType.NUMBER && a.GetValue().IsInteger())
{
var res = new Set();
foreach (var root in Number.GetAllRoots(1, a.GetValue().AsIntegerNumber()).FiniteSet())
{
res.AddRange(FindInvertExpression(un, root * MathS.Pow(value, 1 / a), x));
}
return(res);
}
else
{
return(FindInvertExpression(un, MathS.Pow(value, 1 / a), x));
}
}
else
{
// a ^ x = value => x = log(a, value)
return(FindInvertExpression(un, MathS.Log(a, value) + 2 * MathS.i * n * MathS.pi, x));
}
default:
throw new SysException("Unknown operator");
}
}