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ファンクション・ジェネレータ
Dependencies: mbed SerialTxRxIntr MyTicker7 Array_Matrix
FastSin.hpp
- Committer:
- MikamiUitOpen
- Date:
- 2020-10-17
- Revision:
- 0:17c762b41fc7
- Child:
- 1:ea5aa7f3d68c
File content as of revision 0:17c762b41fc7:
//----------------------------------------------------------- // FastSin() 関数 // sin(π/2)x) の値の計算 // // 2020/06/01, Copyright (c) 2020 MIKAMI, Naoki //----------------------------------------------------------- #ifndef FASTSIN_POLYNOMIAL_HPP #define FASTSIN_POLYNOMIAL_HPP namespace Mikami { // 引数の範囲: -2 <= x <= 2 inline float FastSin(float x) { static const float A1 = 1.570320019210f; static const float A3 = -0.642113166941f; static const float A5 = 0.071860854119f; if (x > 1.0f) x = 2.0f - x; if (x < -1.0f) x = -2.0f - x; float x2 = x*x; return ((A5*x2 + A3)*x2 + A1)*x; } } #endif // FASTSIN_POLYNOMIAL_HPP