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feat: Add MathUtility.ExponentialDecay (#60)
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@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- Added .NET 7 target.
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- Added .NET 7 target.
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- X10D: Added `IntrinsicExtensions` and `IntrinsicUtility` which offer methods for vectors in `System.Runtime.Instrinsics`. (#70)
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- X10D: Added `IntrinsicExtensions` and `IntrinsicUtility` which offer methods for vectors in `System.Runtime.Instrinsics`. (#70)
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- X10D: Added `MathUtility.Bias(float, float)` and `MathUtility.Bias(double, double)`.
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- X10D: Added `MathUtility.Bias(float, float)` and `MathUtility.Bias(double, double)`.
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- X10D: Added `MathUtility.ExponentialDecay(float, float, float)` and `MathUtility.ExponentialDecay(double, double, double)`.
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- X10D: Added `MathUtility.InverseLerp(float, float, float)` and `MathUtility.InverseLerp(double, double, double)`
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- X10D: Added `MathUtility.InverseLerp(float, float, float)` and `MathUtility.InverseLerp(double, double, double)`
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- X10D: Added `MathUtility.ScaleRange(float, float, float, float, float)`
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- X10D: Added `MathUtility.ScaleRange(float, float, float, float, float)`
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and `MathUtility.ScaleRange(double, double, double, double, double)`
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and `MathUtility.ScaleRange(double, double, double, double, double)`
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@ -39,6 +39,32 @@ public class MathUtilityTests
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Assert.AreEqual(0.8f, floatResult, 1e-4f);
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Assert.AreEqual(0.8f, floatResult, 1e-4f);
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}
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}
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[TestMethod]
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public void ExponentialDecay_ShouldReturnCorrectValue_GivenDouble()
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{
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const double value = 100.0;
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const double alpha = 0.5;
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const double decay = 0.1;
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const double expected = 95.122942;
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double actual = MathUtility.ExponentialDecay(value, alpha, decay);
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Assert.AreEqual(expected, actual, 1e-6);
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}
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[TestMethod]
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public void ExponentialDecay_ShouldReturnCorrectValue_GivenSingle()
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{
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const float value = 100.0f;
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const float alpha = 0.5f;
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const float decay = 0.1f;
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const float expected = 95.12295f;
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float actual = MathUtility.ExponentialDecay(value, alpha, decay);
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Assert.AreEqual(expected, actual, 1e-6f);
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}
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[TestMethod]
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[TestMethod]
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public void GammaToLinear_ShouldReturnQuarter_GivenQuarterAndGamma1()
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public void GammaToLinear_ShouldReturnQuarter_GivenQuarterAndGamma1()
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{
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{
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@ -39,6 +39,30 @@ public static class MathUtility
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return value / ((1.0 / bias - 2.0) * (1.0 - value) + 1.0);
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return value / ((1.0 / bias - 2.0) * (1.0 - value) + 1.0);
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}
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}
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/// <summary>
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/// Calculates exponential decay for a value.
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/// </summary>
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/// <param name="value">The value to decay.</param>
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/// <param name="alpha">A factor by which to scale the decay.</param>
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/// <param name="decay">The decay amount.</param>
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/// <returns>The exponentially decayed value.</returns>
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public static float ExponentialDecay(float value, float alpha, float decay)
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{
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return value * MathF.Exp(-decay * alpha);
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}
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/// <summary>
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/// Calculates exponential decay for a value.
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/// </summary>
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/// <param name="value">The value to decay.</param>
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/// <param name="alpha">A factor by which to scale the decay.</param>
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/// <param name="decay">The decay amount.</param>
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/// <returns>The exponentially decayed value.</returns>
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public static double ExponentialDecay(double value, double alpha, double decay)
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{
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return value * System.Math.Exp(-decay * alpha);
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}
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/// <summary>
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/// <summary>
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/// Converts a gamma-encoded value to a linear value using a gamma value of <c>2.2</c>.
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/// Converts a gamma-encoded value to a linear value using a gamma value of <c>2.2</c>.
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/// </summary>
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/// </summary>
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