1: /* 2: * Copyright (c) 1980 Regents of the University of California. 3: * All rights reserved. The Berkeley software License Agreement 4: * specifies the terms and conditions for redistribution. 5: * 6: * @(#)c_log.c 5.1 6/7/85 7: */ 8: 9: #include "complex" 10: 11: c_log(r, z) 12: complex *r, *z; 13: { 14: double log(), cabs(), atan2(); 15: 16: r->imag = atan2(z->imag, z->real); 17: r->real = log( cabs(z->real, z->imag) ); 18: }