float eval_branch(struct node *node, float x, float y, float z, float a)
{
switch (node->token) {
case token_x:
return x;
case token_y:
return y;
case token_z:
return z;
case token_a:
return a;
case token_num:
return node->value;
case token_pow:
return func_pow(eval_branch(node->left, x, y, z, a), node->value);
case token_mul:
return func_mul(eval_branch(node->left, x, y, z, a), eval_branch(node->right, x, y, z, a));
case token_div:
return func_div(eval_branch(node->left, x, y, z, a), eval_branch(node->right, x, y, z, a));
case token_add:
return func_add(eval_branch(node->left, x, y, z, a), eval_branch(node->right, x, y, z, a));
case token_sub:
return func_sub(eval_branch(node->left, x, y, z, a), eval_branch(node->right, x, y, z, a));
case token_neg:
return func_neg(0, eval_branch(node->right, x, y, z, a));
case token_sqrt:
return func_sqrt(0, eval_branch(node->right, x, y, z, a));
case token_sin:
return func_sin(0, eval_branch(node->right, x, y, z, a));
case token_cos:
return func_cos(0, eval_branch(node->right, x, y, z, a));
default:
return 0;
}
}
func_t *func_diff_tan_pow1(func_t *f, int var)
{
func_t *fx=NULL,*g=NULL,*gx=NULL;
if(!func_is(f,"tan") || func_power(f)!=1){ FUNC_ERROR_ARG1("func_diff_tan",f); }
g=f->a[0];
gx=func_diff(FR(g),func_var1(var,1));
fx=func_mul(func_pow_n(func_cos(FR(g)),-2),gx);
f=func_del(f);
return fx;
}
