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HP-UX Reference > C
clog2(3M)HP Integrity Server OnlyHP-UX 11i Version 2: December 2007 Update |
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NAMEclog2(), clog2f(), clog2l(), clog2w(), clog2q() — complex base-2 logarithm functions SYNOPSIS#include <complex.h> double complex clog2(double complex z); float complex clog2f(float complex z); long double complex clog2l(long double complex z); extended complex clog2w(extended complex z); quad complex clog2q(quad complex z); DESCRIPTIONclog2() returns the complex base-2 logarithm of z in the range of a strip mathematically unbounded along the real axis and in the interval [-iPi/log(2) ,+iPi/log(2)] along the imaginary axis. There is a branch cut along the negative real axis. clog2f() is a float complex version of clog2(); it takes a float complex argument and returns a float complex result. clog2l() is a long double complex version of clog2(); it takes a long double complex argument and returns a long double complex result. clog2w() is an extended complex version of clog2(); it takes an extended complex argument and returns an extended complex result. clog2q() is equivalent to clog2l() on HP-UX systems. USAGETo use these functions, compile with the default -Ae option. To use clog2w() or clog2q(), compile with the -fpwidetypes option. Make sure your program includes <complex.h>. Link in the math library by specifying -lm on the compiler or linker command line. RETURN VALUEclog2(conj(z)) = conj(clog2(z)). clog2(-0+i0) returns -Inf+iPi/log(2) and raises the divide-by-zero floating-point exception. clog2(+0+i0) returns -Inf+i0 and raises the divide-by-zero floating-point exception. clog2(x+iInf) returns +Inf+iPi/(2log(2)), for finite x. clog2(x+iNaN) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite x. clog2(-Inf+iy) returns +Inf+iPi/log(2), for finite positive-signed y. clog2(+Inf+iy) returns +Inf+i0, for finite positive-signed y. clog2(-Inf+iInf) returns +Inf+i3Pi/(4log(2)). clog2(+Inf+iInf) returns +Inf+iPi/(4log(2)). clog2(±Inf+iNaN) returns +Inf+iNaN. clog2(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite y. clog2(NaN+iInf) returns +Inf+iNaN. clog2(NaN+iNaN) returns NaN+iNaN. |
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