Archangel
83 lines
3.2 KiB
C#
83 lines
3.2 KiB
C#
namespace SPTarkov.Server.Core.Extensions;
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public static class MathExtensions
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{
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/// <summary>
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/// Helper to create the cumulative sum of all enumerable elements
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/// [1, 2, 3, 4].CumulativeSum() = [1, 3, 6, 10]
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/// </summary>
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/// <param name="values">The enumerable with numbers of which to calculate the cumulative sum</param>
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/// <returns>cumulative sum of values</returns>
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public static IEnumerable<double> CumulativeSum(this IEnumerable<double> values)
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{
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double sum = 0;
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foreach (var value in values)
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{
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sum += value;
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yield return sum;
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}
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}
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/// <summary>
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/// Helper to create the cumulative sum of all enumerable elements
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/// [1, 2, 3, 4].CumulativeSum() = [1, 3, 6, 10]
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/// </summary>
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/// <param name="values">The enumerable with numbers of which to calculate the cumulative sum</param>
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/// <returns>cumulative sum of values</returns>
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public static IEnumerable<float> CumulativeSum(this IEnumerable<float> values)
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{
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float sum = 0;
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foreach (var value in values)
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{
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sum += value;
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yield return sum;
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}
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}
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/// <summary>
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/// Helper to create the product of each element times factor
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/// </summary>
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/// <param name="values">The enumerable of numbers which shall be multiplied by the factor</param>
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/// <param name="factor">Number to multiply each element by</param>
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/// <returns>An enumerable of elements all multiplied by the factor</returns>
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public static IEnumerable<double> Product(this IEnumerable<double> values, double factor)
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{
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return values.Select(v => v * factor);
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}
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/// <summary>
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/// Helper to create the product of each element times factor
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/// </summary>
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/// <param name="values">The enumerable of numbers which shall be multiplied by the factor</param>
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/// <param name="factor">Number to multiply each element by</param>
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/// <returns>An enumerable of elements all multiplied by the factor</returns>
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public static IEnumerable<float> Product(this IEnumerable<float> values, float factor)
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{
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return values.Select(v => v * factor);
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}
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/// <summary>
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/// Helper to determine if one double is approx equal to another double
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/// </summary>
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/// <param name="value">Value to check</param>
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/// <param name="target">Target value</param>
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/// <param name="error">Error value</param>
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/// <returns>True if value is approx target within the error range</returns>
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public static bool Approx(this double value, double target, double error = 0.001d)
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{
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return Math.Abs(value - target) <= error;
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}
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/// <summary>
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/// Helper to determine if one float is approx equal to another float
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/// </summary>
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/// <param name="value">Value to check</param>
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/// <param name="target">Target value</param>
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/// <param name="error">Error value</param>
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/// <returns>True if value is approx target within the error range</returns>
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public static bool Approx(this float value, float target, float error = 0.001f)
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{
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return Math.Abs(value - target) <= error;
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}
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}
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