CLOG(3) BSD Library Functions Manual CLOG(3)

NAME
     cclloogg - complex logarithm function

SYNOPSIS
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     double complex
     cclloogg(double complex z);

     long double complex
     ccllooggll(long double complex z);

     float complex
     ccllooggff(float complex z);

DESCRIPTION
     cclloogg(z) returns the complex logarithm of z.

     clog(conj(z)) = conj(clog(z)), for all complex floating-point numbers z.

SSPPEECCIIAALL VVAALLUUEESS
     The conjugate symmetry of clog() is used to abbreviate the specification
     of special values.

     cclloogg(-0 + 0i) returns -inf + Pi i and raises the divide-by-zero flag.

     cclloogg(0 + 0i) returns -inf + 0i and raises the divide-by-zero flag.

     cclloogg(x + inf i) returns inf + Pi/2 i, for finite x.

     cclloogg(x + NaN i) returns NaN + NaN i.

     cclloogg(-inf + yi) returns inf + Pi i, for finite positive y.

     cclloogg(inf + yi) returns inf + 0i, for finite positive y.

     cclloogg(-inf + inf i) returns inf + 3Pi/4 i.

     cclloogg(inf + inf i) returns inf + Pi/4 i.

     cclloogg(+-inf + NaN i) returns inf + NaN i.

     cclloogg(NaN + yi) returns NaN + NaN i, for finite y.

     cclloogg(NaN + inf i) returns inf + NaN i.

     cclloogg(NaN + NaN i) returns NaN + NaN i.

NNOOTTEESS
SEE ALSO
     cexp(3) log(3) complex(3)

STANDARDS     The cclloogg() function conforms to ISO/IEC 9899:1999(E).

4th Berkeley Distribution      November 9, 2006      4th Berkeley Distribution