/*- * Copyright (c) 1980 The Regents of the University of California. * All rights reserved. * * This module is believed to contain source code proprietary to AT&T. * Use and redistribution is subject to the Berkeley Software License * Agreement and your Software Agreement with AT&T (Western Electric). */ #ifndef lint static char sccsid[] = "@(#)z_log.c 5.3 (Berkeley) 4/12/91"; #endif /* not lint */ #include "complex" #ifdef tahoe #define cabs zabs #endif tahoe z_log(r, z) dcomplex *r, *z; { double log(), cabs(), atan2(); r->dimag = atan2(z->dimag, z->dreal); r->dreal = log( cabs( z->dreal, z->dimag ) ); }