1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)LN.c 1.3 01/06/81"; 4 5 #include <math.h> 6 #include "h01errs.h" 7 8 double 9 LN(value) 10 11 double value; 12 { 13 if (value <= 0) { 14 ERROR(ELN, value); 15 return; 16 } 17 return log(value); 18 } 19