[求助] 求助三元函数二阶偏微分C语言写法

5楼: Originally posted by zhenzhen5516 at 2011-09-01 10:07:43:
哦，可能是我没说清楚。函数是u1=u1(x,y,z), K 是常量，u只是x y z的函数，下三角是二次微分算子，具体的我另上传了一个附件，可供参考~谢谢，等待您的回复

double func(double a, double b, double x){
    return a*x+b;
}

typedef struct{
    double a, b;
    double (*func)(double a, double b, double x);
} CFunc;
CFunc *factory(double a, double b){
    CFunc *f = malloc(sizeof(CFunc));
    f->a = a;
    f->b = b;
    f->func = func;
    return f;
}
double caller(CFunc *fc, double x){
    return fc->func(fc->a, fc->b, x);
}

2楼: Originally posted by huycwork at 2011-08-31 12:59:59:
你把算法直观地说一遍，我帮你写C语言要的不？

3楼: Originally posted by zhenzhen5516 at 2011-08-31 16:01:08:
非常感谢！为了您方便看，我把算法上传到附件里了，麻烦您下载一下！只要您写出一项我应该就能明白了~