72 lines
929 B
C++
72 lines
929 B
C++
//-----------------------------------------------------------------------------
|
|
//
|
|
// Bessel Y function
|
|
//
|
|
// Input: tos-2 x (can be a symbol or expr)
|
|
//
|
|
// tos-1 n
|
|
//
|
|
// Output: Result on stack
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include "stdafx.h"
|
|
#include "defs.h"
|
|
|
|
void
|
|
eval_bessely(void)
|
|
{
|
|
push(cadr(p1));
|
|
eval();
|
|
push(caddr(p1));
|
|
eval();
|
|
bessely();
|
|
}
|
|
|
|
void
|
|
bessely(void)
|
|
{
|
|
save();
|
|
yybessely();
|
|
restore();
|
|
}
|
|
|
|
#define X p1
|
|
#define N p2
|
|
|
|
void
|
|
yybessely(void)
|
|
{
|
|
double d;
|
|
int n;
|
|
|
|
N = pop();
|
|
X = pop();
|
|
|
|
push(N);
|
|
n = pop_integer();
|
|
|
|
if (isdouble(X) && n != (int) 0x80000000) {
|
|
d = yn(n, X->u.d);
|
|
push_double(d);
|
|
return;
|
|
}
|
|
|
|
if (isnegativeterm(N)) {
|
|
push_integer(-1);
|
|
push(N);
|
|
power();
|
|
push_symbol(BESSELY);
|
|
push(X);
|
|
push(N);
|
|
negate();
|
|
list(3);
|
|
multiply();
|
|
return;
|
|
}
|
|
push_symbol(BESSELY);
|
|
push(X);
|
|
push(N);
|
|
list(3);
|
|
return;
|
|
} |