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2Â¥: Originally posted by huycwork at 2011-08-31 12:59:59:
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3Â¥: Originally posted by zhenzhen5516 at 2011-08-31 16:01:08:
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4Â¥: Originally posted by huycwork at 2011-09-01 09:12:31:
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5Â¥: Originally posted by zhenzhen5516 at 2011-09-01 10:07:43:
Ŷ£¬¿ÉÄÜÊÇÎÒû˵Çå³þ¡£º¯ÊýÊÇu1=u1(x,y,z), K Êdz£Á¿£¬uÖ»ÊÇx y zµÄº¯Êý£¬ÏÂÈý½ÇÊǶþ´Î΢·ÖËã×Ó£¬¾ßÌåµÄÎÒÁíÉÏ´«ÁËÒ»¸ö¸½¼þ£¬¿É¹©²Î¿¼~лл£¬µÈ´ýÄúµÄ»Ø¸´

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);
}

6Â¥: Originally posted by huycwork at 2011-09-01 10:45:05:
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»ìºÏÆ«µ¼ÊýµÄ¶¨Òåʽdf/dxdy = d(df/dy)/dx£¬df/dy²¿·Ö·µ»ØÒ»¸öº¯Êý£¬¶øCÓïÑÔûÓÐÖ±½ÓÖ§³Ö·µ»Ø´ø²Îº¯ÊýµÄ»úÖÆ¡£
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7Â¥: Originally posted by zhenzhen5516 at 2011-09-01 11:33:37:
ßÀ£¬·Ç³£¸ÐлÄúµÄÏêϸ»Ø¸´¡£²»¹ýÎÒû̫¿´Ã÷°×£¬ÆäʵÎÒµÄÎÊÌâ¾ÍÊÇdf/dxdy = d(df/dy)/dxÈçºÎÔÚ³ÌÐòÀïд½øÈ¥£¬±ÈÈçdf2/dx2(±íʾº¯ÊýF¶ÔxµÄ¶þ´Î΢·Ö£©¿ÉÒÔÔÚ³ÌÐòÀï¼òµ¥Ð´³Éf(x+1,y,z)+f(x-1,y,z)-2f(x,y,z)£¬ÄÇôd( ...

Func: f(x, y, z);
Funcx: df/dx = Func(x+dx, y, z) - Func(x, y, z)   / dx;
Funcy: df/dy = Func(x, y+dy, z) - Func(x, y, z)   / dy;
Funcz: df/dz = Func(x, y, z+dz) - Func(x, y, z)   / dz;
Funcyx: Funcy/dx = Funcy(x+dx, y, z) - Funcy(x, y, z)  / dx;
Funczy: Funcz/dy
Funcxz: Funcx/dz

8Â¥: Originally posted by huycwork at 2011-09-01 13:53:10:
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