http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52439
Bug #: 52439 Summary: Calculation of natural log Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassig...@gcc.gnu.org ReportedBy: dtov...@hotmail.com Created attachment 26788 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26788 simple fortran calculation of the natural logs mentioned in the description. Among other files in the zip file, I included a batch file, executable and output files. using gfortran (4.7.0): calculation of DLOG(0.01) = -4.60517020833983359295871196081862 calculation of DLOG(100.0) = 4.60517018598809180218722758581862 Numbers should match except for the sign, the value for DLOG(0.01) also appears outside a tolerance I expect to find. using another a calculation routine with another compiler calculation of DLOG(0.01) = -4.605170185988091368035982909369 calculation of DLOG(100.0) = 4.605170185988091368035982909369