谁能提供给我SIN，COS等三角函数的原代码？

football 2003-05-16 01:37:33

谁能提供给我SIN，COS等三角函数的原代码？非常感谢。

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shine333 2003-05-16

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第n项：f(n)(x0)*x^n/n!
f(n)(x0),在x0处n阶导数

shine333 2003-05-16

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to programmer200x(卧龙200x)
精度就是看Rx,他是被舍弃的项，精度精确到多少完全取决于Rx是第几项

celeil 2003-05-16

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晕~，学编程竟然不知道泰勒展开式，或者不知道在哪里可以找到泰勒展开式。

mechgoukiteng 2003-05-16

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写个数组放入数值

到时候查表。。。。。嘿嘿

programmer200x 2003-05-16

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to Solstice(大佛)
精度是多少啊？

gwsr 2003-05-16

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泰勒公式：
f(x)=f(x0)+f'(x0)(x-x0)+f''(x0)(x-x0)^2/2!+....+R(x)

另：sin x=x-x^3/3!+x^5/5!-....

陈硕 2003-05-16

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一段古老的代码：
/*
* Sine<N,I> Calculates sin(2*Pi*I/N)
* Cos<N,I> Calculates cos(2*Pi*I/N)
*/

/*
* First, compile-time trig functions sin(x) and cos(x).
*/

template<unsigned N, unsigned I>
class Sine {
public:
static inline float sin()
{
// This is a series expansion for sin(I*2*M_PI/N)
// Since all of these quantities are known at compile time, it gets
// simplified to a single constant, which can be included in the code:
// mov dword ptr es:[bx],large 03F3504F3h

return (I*2*M_PI/N)*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/2/3*(1-(I*2*M_PI/N)*
(I*2*M_PI/N)/4/5*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/6/7*(1-(I*2*M_PI/N)*
(I*2*M_PI/N)/8/9*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/10/11*(1-(I*2*M_PI/N)*
(I*2*M_PI/N)/12/13*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/14/15*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/16/17*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/18/19*(1-(I*2*M_PI/N)*
(I*2*M_PI/N)/20/21))))))))));
}
};

template<unsigned N, unsigned I>
class Cosine {
public:
static inline float cos()
{
// This is a series expansion for cos(I*2*M_PI/N)
// Since all of these quantities are known at compile time, it gets
// simplified to a single number.
return 1-(I*2*M_PI/N)*(I*2*M_PI/N)/2*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/3/4*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/5/6*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/7/8*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/9/10*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/11/12*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/13/14*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/15/16*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/17/18*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/19/20*
(1-(I*2*M_PI/N)*(I*2*M_PI/N)/21/22*(1-(I*2*M_PI/N)*(I*2*M_PI/N)/23/24
)))))))))));
}

};

football 2003-05-16