1 /*- 2 * Copyright (c) 1980 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.proprietary.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)c_log.c 5.2 (Berkeley) 04/12/91"; 10 #endif /* not lint */ 11 12 #include "complex" 13 c_log(r,z)14c_log(r, z) 15 complex *r, *z; 16 { 17 double log(), cabs(), atan2(); 18 19 r->imag = atan2(z->imag, z->real); 20 r->real = log( cabs(z->real, z->imag) ); 21 } 22