cplxexp(3C++)
cplxexp: exp, log, pow, sqrt --
exponential, logarithm, power, square root functions
Synopsis
#include <complex.h>
class complex {
public:
friend complex exp(complex);
friend complex log(complex);
friend complex pow(double, complex);
friend complex pow(complex, int) throw();
friend complex pow(complex, double);
friend complex pow(complex, complex);
friend complex sqrt(complex) throw();
};
Description
The following math functions are overloaded by the complex library,
where:
-- x, y, and z are of type complex.
z = exp(x)-
Returns
e[x].
z = log(x)-
Returns the natural logarithm of
x.
z = pow(x, y)-
Returns
x[y].
z = sqrt(x)-
Returns the square root of
x,
contained in the first or fourth quadrants of the complex plane.
References
complex(3C++),
cartpol(3C++),
complex_error(3C++),
cplxops(3C++),
cplxtrig(3C++).
Diagnostics
exp
returns
(0, 0)
when the real part of x is so small,
or the imaginary part is so large,
as to cause overflow.
When the real part is large enough to cause overflow,
exp
returns
(HUGE, HUGE)
if the cosine and sine of the imaginary part of x are positive,
(HUGE, -HUGE)
if the cosine is positive and the sine is not,
(-HUGE, HUGE)
if the sine is positive and the cosine is not,
and
(-HUGE, -HUGE)
if neither sine nor cosine is positive.
In all these cases,
errno
is set to ERANGE.
log returns (-HUGE, 0) and sets
errno
to EDOM when
x
is (0, 0).
These error-handling procedures may be changed with the function
complex_error(3C++).
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004