public void FloatPredeteriminationTest()
{
var p = new Problem(nameof(GeneralSumConstraintTest));
var dom = new FloatDomain("unit", -1, 1);
var x = (FloatVariable)dom.Instantiate("x");
var y = (FloatVariable)dom.Instantiate("y");
y.PredeterminedValue = 1;
var sum = x + y;
int spuriousHitCount = 0;
for (int i = 0; i < 100; i++)
{
var v = Random.Float(-1, 1);
x.PredeterminedValue = v;
var s = p.Solve();
// Should always give us the predetermined value
Assert.AreEqual(x.Value(s), v);
Assert.AreEqual(sum.Value(s), v + 1);
if (i % 2 == 0)
{
x.Reset();
s = p.Solve();
// Should almost never give us the formerly predetermined value
// ReSharper disable CompareOfFloatsByEqualityOperator
if (x.Value(s) == v || sum.Value(s) == v + 1)
{
// ReSharper restore CompareOfFloatsByEqualityOperator
spuriousHitCount++;
}
}
}
Assert.IsTrue(spuriousHitCount < 3);
}
public void FloatPredeterminationTest()
{
var problem = new Problem("test");
var dom = new FloatDomain("signed unit", -1, 1);
var x = (FloatVariable)dom.Instantiate("x", problem);
var y = (FloatVariable)dom.Instantiate("y", problem);
var z = (FloatVariable)dom.Instantiate("z", problem);
var bigThresh = 1.5f;
var smallThresh = -2.3f;
var xBig = x > bigThresh;
var ySmall = y < smallThresh;
var zBig = z > bigThresh;
var zSmall = z < smallThresh;
var xLTy = x < y;
var xGTz = x > z;
var yLTz = y < z;
for (var i = 0; i < 100; i++)
{
var xVal = Random.Float(-1, 1);
var yVal = Random.Float(-1, 1);
x.PredeterminedValue = xVal;
y.PredeterminedValue = yVal;
var s = problem.Solve();
Assert.AreEqual(xVal, x.Value(s));
Assert.AreEqual(yVal, y.Value(s));
Assert.IsTrue(problem.IsPredetermined(xBig));
Assert.AreEqual(s[xBig], xVal >= bigThresh);
Assert.IsTrue(problem.IsPredetermined(ySmall));
Assert.AreEqual(s[ySmall], yVal <= smallThresh);
Assert.IsTrue(problem.IsPredetermined(xLTy));
Assert.AreEqual(s[xLTy], xVal <= yVal);
Assert.IsFalse(problem.IsPredetermined(zBig));
Assert.IsFalse(problem.IsPredetermined(zSmall));
Assert.IsFalse(problem.IsPredetermined(xGTz));
Assert.IsFalse(problem.IsPredetermined(yLTz));
}
}
public void ConstantProductConstraintTest()
{
for (int j = 0; j < 100; j++)
{
var p = new Problem(nameof(ConstantProductConstraintTest));
var dom = new FloatDomain("signed unit", -1, 1);
var x = (FloatVariable)dom.Instantiate("x");
var c = Random.Float(-100, 100);
var product = c * x;
for (int i = 0; i < 100; i++)
{
var s = p.Solve();
Console.WriteLine(s.Model);
Assert.IsTrue(Math.Abs(product.Value(s) / (x.Value(s)) - c) < 0.0001f);
}
}
}