c等价于matlab的sind和cosd函数 [英] c equavilent to matlab's sind and cosd function

问题描述

因此，我正在处理一些将Matlab代码手动转换为C代码的问题.我只是想知道是否有一个C等于我在matlab代码中看到的sind和cosd函数.我猜这返回的是度数的答案，而不是给出弧度结果的c sin和cos函数.我想我可以将结果乘以180/pi，但只是想知道math.h中是否有库函数，所以我没有看到.或者即使gsl库中有执行此操作的文件.

So I am working with some matlab code converting to c code by hand. I am just wondering if there is a c equivalent to the sind and cosd functions I'm seeing in the matlab code. I guess this returns the answer in degrees rather than the c sin and cos function that gives the result in radians. I guess I could just multiply the result by 180/pi but was just wondering if there was a library function in math.h I'm not seeing. Or even if there is something in the gsl library that does that.

推荐答案

由于M_PI的不精确性，对于大参数，H2CO3的解决方案将导致灾难性的精度损失.任何参数的通用安全版本是:

H2CO3's solution will have catastrophic loss of precision for large arguments due to the imprecision of M_PI. The general, safe version for any argument is:

#define sind(x) (sin(fmod((x),360) * M_PI / 180))

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