1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556 |
- // Do the exponential cosine function.
- #include "stdafx.h"
- #include "defs.h"
- void
- eval_expcos(void)
- {
- push(cadr(p1));
- eval();
- expcos();
- }
- void
- expcos(void)
- {
- save();
- p1 = pop();
- push(imaginaryunit);
- push(p1);
- multiply();
- exponential();
- push_rational(1, 2);
- multiply();
- push(imaginaryunit);
- negate();
- push(p1);
- multiply();
- exponential();
- push_rational(1, 2);
- multiply();
- add();
- restore();
- }
- #if SELFTEST
- static char *s[] = {
- "expcos(x)",
- "1/2*exp(-i*x)+1/2*exp(i*x)",
- };
- void
- test_expcos(void)
- {
- test(__FILE__, s, sizeof s / sizeof (char *));
- }
- #endif
|