| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | // Various math utility functions, implemented in microcontroller friendly ways. | |||
| 2 | ||||
| 3 | #pragma once | |||
| 4 | ||||
| 5 | #include <rusefi/expected.h> | |||
| 6 | ||||
| 7 | #include <cstddef> | |||
| 8 | ||||
| 9 | // absolute value | |||
| 10 | 60043 | constexpr int absI(int value) { | ||
| 11 | 60043 | return value > 0 ? value : -value; | ||
| 12 | } | |||
| 13 | 1489881 | constexpr float absF(float value) { | ||
| 14 |
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1489881 | return value > 0 ? value : -value; | |
| 15 | } | |||
| 16 | ||||
| 17 | // Min/max | |||
| 18 | int maxI(int i1, int i2); | |||
| 19 | int minI(int i1, int i2); | |||
| 20 | float maxF(float i1, float i2); | |||
| 21 | float minF(float i1, float i2); | |||
| 22 | ||||
| 23 | // Clamping | |||
| 24 | float clampF(float min, float clamp, float max); | |||
| 25 | ||||
| 26 | // Returns if two floats are within 0.0001 | |||
| 27 | bool isSameF(float a, float b); | |||
| 28 | ||||
| 29 | // @brief Compute e^x using a 4th order taylor expansion centered at x=-1. Provides | |||
| 30 | // bogus results outside the range -2 < x < 0. | |||
| 31 | float expf_taylor(float x); | |||
| 32 | ||||
| 33 | // @brief Compute tan(theta) using a ratio of the Taylor series for sin and cos | |||
| 34 | // Valid for the range [0, pi/2 - 0.01] | |||
| 35 | float tanf_taylor(float theta); | |||
| 36 | ||||
| 37 | struct NewtonsMethodSolver | |||
| 38 | { | |||
| 39 | // Solve for a value of x such that fx(x)=0 | |||
| 40 | // x0 is the initial guess | |||
| 41 | // deltaX controls when to stop - when abs((estimate N) - (estimate N-1)) < deltaX, stop calculation. | |||
| 42 | // Returns unexpected if failed to converge | |||
| 43 | expected<float> solve(float x0, float deltaX, size_t maxIteration = 20); | |||
| 44 | ||||
| 45 | // Function for which we want to find a root 0 = fx(x) | |||
| 46 | virtual float fx(float x) = 0; | |||
| 47 | ||||
| 48 | // First derivative of fx(x) | |||
| 49 | virtual float dfx(float x) = 0; | |||
| 50 | }; | |||
| 51 |