public void CreateInterpolator_ReturnedFunctionEvaluatedInMiddleOfXInputs_ReturnsMiddleOfYInputs()
{
var xCoords = new[] { 1.2, 2.0, 3.4 };
var yCoords = new[] { 15.5, 23.48, -41.5 };
var linearInterpolatorFactor = new LinearInterpolatorFactory();
Func <double, double> interpolator = linearInterpolatorFactor.CreateInterpolator(xCoords, yCoords);
double x = 1.6;
double y = interpolator(x);
double expectedY = 15.5 + (23.48 - 15.5) / 2.0;
Assert.Equal(expectedY, y);
}
public void CreateInterpolator_ReturnsFunctionWhichEvaluatesToInputs()
{
var xCoords = new[] { 1.2, 1.8, 2.5 };
var yCoords = new[] { 46.56, -1.58, 8.556 };
var linearInterpolatorFactor = new LinearInterpolatorFactory();
Func <double, double> interpolator = linearInterpolatorFactor.CreateInterpolator(xCoords, yCoords);
for (int i = 0; i < xCoords.Length; i++)
{
double x = xCoords[i];
double y = interpolator(x);
double expectedY = yCoords[i];
Assert.Equal(expectedY, y);
}
}
