PTAN 3CW "11 July 2007" "mathcw-1.00"

Table of contents


NAME

ptanf, ptan, ptanl, ptanw, ptanq, ptanll, ptandf, ptand, ptandl, ptandll - pair-precision tangent

SYNOPSIS

cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ]

#include <mathcw.h>
#include <paircw.h>

extern void ptanf (float_pair result, const float_pair x);

extern void ptan (double_pair result, const double_pair x);

extern void ptanl (long_double_pair result, const long_double_pair x);

extern void ptanw (__float80_pair result, const __float80_pair x);

extern void ptanq (__float128_pair result, const __float128_pair x);

extern void ptanll (long_long_double_pair result, const long_long_double_pair x);

extern void ptandf (decimal_float_pair result, const decimal_float_pair x);

extern void ptand (decimal_double_pair result, const decimal_double_pair x);

extern void ptandl (decimal_long_double_pair result, const decimal_long_double x);

extern void ptandll (decimal_long_long_double_pair result, const decimal_long_long_double x);

NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.


DESCRIPTION

Compute the pair-precision tangent of x.

RETURN VALUES

None. The function result is stored in the first argument, result.

CAVEATS

Trigonometric functions are computed by reducing the argument to a multiple of pi or 2pi plus a small remainder, and the function is then computed for that remainder. The finite precision of computer arithmetic limits the precision of the remainder for large-magnitude arguments, and eventually, all accuracy is lost, and the function value is effectively meaningless. In practical applications, it is usually possible to eliminate large arguments by exact mathematical reduction before doing a computation.

ERRORS

None.

SEE ALSO

pabs(3CW), pacos(3CW), pacosh(3CW), padd(3CW), pasin(3CW), pasinh(3CW), patan(3CW), patan2(3CW), patanh(3CW), pcbrt(3CW), pcmp(3CW), pcon(3CW), pcopy(3CW), pcopysign(3CW), pcos(3CW), pcosh(3CW), pcotan(3CW), pdiv(3CW), pdot(3CW), peps(3CW), peval(3CW), pexp(3CW), pexp10(3CW), pexp16(3CW), pexp2(3CW), pexp8(3CW), pexpm1(3CW), pfdim(3CW), pfmax(3CW), pfmin(3CW), pfrexp(3CW), pfrexph(3CW), phigh(3CW), phypot(3CW), pierf(3CW), pierfc(3CW), pilogb(3CW), pin(3CW), pinfty(3CW), pipow(3CW), pisinf(3CW), pisnan(3CW), pisqnan(3CW), pissnan(3CW), pldexp(3CW), pldexph(3CW), plog(3CW), plog101p(3CW), plog1p(3CW), plow(3CW), pmul(3CW), pmul2(3CW), pneg(3CW), pout(3CW), pprosum(3CW), pqnan(3CW), pscalbln(3CW), pscalbn(3CW), pset(3CW), psignbit(3CW), psin(3CW), psinh(3CW), psnan(3CW), psplit(3CW), psqrt(3CW), psub(3CW), psum(3CW), psum2(3CW), ptanh(3CW).