From help-octave-request at bevo dot che dot wisc dot edu Wed Jan 10 09:45:39 2001 Subject: Wrong 'log' results when using .oct files From: Javier Perez To: help-octave at bevo dot che dot wisc dot edu Date: Wed, 10 Jan 2001 17:47:55 +0100 (CET) Hi all. I'm trying to compute the logarithm in base 2 of a number, in C++, since it's part of a .oct file. The code is really simple, and it works fine in a standalone program. The problem is that when used inside a .oct file, the file "octave/config.h" is included, and the results change. Am I doing some stupid mistake? Should I use a different way of computing the logarithm?? This simple code demonstrates my problem: <-------- begin: "test_log.cc" ------------> #include #include #include int main() { int M = 8; double j = log(M)/log(2); std::cout << "(int) log2(" << M << "): " << j << " " << (int)j << std::endl; return 1; } <-------- end: "test_log.cc" -------------> I'm compiling using: gcc -O3 -mcpu=k6 -mieee-fp -fno-rtti -fno-exceptions -fPIC -fno-implicit-templates -o test_log test_log.cc -lg++ -I/home/jape/local//include/octave-2.1.32 -I/home/jape/local//include/octave-2.1.32/octave -I/home/jape/local//include -I/home/jape/cur/functions Commenting out the line #include everything works fine, and I obtain the result "3". jape at shiraz:~/cur/# ./test_log (int) log2(8): 3 3 The problem is when including that file, because the result is "2". jape at shiraz:~/cur/# ./test_log (int) log2(8): 3 2 Any idea why is this way? Thanks in advance I include the results of the bug report tool: Subject: [50 character or so descriptive subject here (for reference)] -------- Bug report for Octave 2.1.32 configured for %OCTAVE_CANONICAL_HOST_TYPE% Configuration (please do not edit this section): ----------------------------------------------- uname output: Linux shiraz 2.2.14 #5 SMP Tue Mar 14 22:11:28 CET 2000 i586 unknown configure opts: --prefix=/home/jape/local/ --enable-shared Fortran compiler: g77 FFLAGS: -O3 -mcpu=k6 F2C: F2CFLAGS: FLIBS: -lg2c -lm -L/usr/lib/gcc-lib/i386-linux/2.95.2 -lm CPPFLAGS: INCFLAGS: -I. -I. -I./liboctave -I./src -I./libcruft/misc -I./glob -I./glob C compiler: gcc, version 2.95.2 20000220 (Debian GNU/Linux) CFLAGS: -O3 -mcpu=k6 CPICFLAG: -fPIC C++ compiler: c++, version 2.95.2 20000220 (Debian GNU/Linux) CXXFLAGS: -O3 -mcpu=k6 CXXPICFLAG: -fPIC LDFLAGS: -g LIBFLAGS: -L. RLD_FLAG: -Xlinker -rpath -Xlinker /home/jape/local//lib/octave-2.1.32 TERMLIBS: -lncurses LIBS: -ldl -lhdf5 -lm LEXLIB: LIBPLPLOT: LIBDLFCN: LIBGLOB: ./glob/glob.o ./glob/fnmatch.o DEFS: -DOCTAVE_SOURCE=1 -DSEPCHAR=':' -DSEPCHAR_STR=":" -DUSE_READLINE=1 -D__NO_MATH_INLINES=1 -DCXX_NEW_FRIEND_TEMPLATE_DECL=1 -DHAVE_LIBM=1 -DHAVE_HDF5_H=1 -DHAVE_HDF5=1 -DF77_APPEND_UNDERSCORE=1 -DSIZEOF_SHORT=2 -DSIZEOF_INT=4 -DSIZEOF_LONG=4 -DSIZEOF_LONG_LONG=8 -DHAVE_ALLOCA_H=1 -DHAVE_ALLOCA=1 -DNPOS=std::string::npos -DSTDC_HEADERS=1 -DHAVE_DIRENT_H=1 -DTIME_WITH_SYS_TIME=1 -DHAVE_SYS_WAIT_H=1 -DHAVE_ASSERT_H=1 -DHAVE_CURSES_H=1 -DHAVE_DLFCN_H=1 -DHAVE_FCNTL_H=1 -DHAVE_FLOAT_H=1 -DHAVE_FNMATCH_H=1 -DHAVE_GLOB_H=1 -DHAVE_GRP_H=1 -DHAVE_LIMITS_H=1 -DHAVE_MEMORY_H=1 -DHAVE_NCURSES_H=1 -DHAVE_POLL_H=1 -DHAVE_PWD_H=1 -DHAVE_SGTTY_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_SYS_IOCTL_H=1 -DHAVE_SYS_PARAM_H=1 -DHAVE_SYS_POLL_H=1 -DHAVE_SYS_RESOURCE_H=1 -DHAVE_SYS_SELECT_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_SYS_TIME_H=1 -DHAVE_SYS_TIMES_H=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_UTSNAME_H=1 -DHAVE_TERMCAP_H=1 -DHAVE_TERMIO_H=1 -DHAVE_UNISTD_H=1 -DHAVE_VARARGS_H=1 -DHAVE_ATEXIT=1 -DHAVE_BCOPY=1 -DHAVE_BZERO=1 -DHAVE_DUP2=1 -DHAVE_ENDGRENT=1 -DHAVE_ENDPWENT=1 -DHAVE_EXECVP=1 -DHAVE_FCNTL=1 -DHAVE_FORK=1 -DHAVE_GETCWD=1 -DHAVE_GETEGID=1 -DHAVE_GETEUID=1 -DHAVE_GETGID=1 -DHAVE_GETGRENT=1 -DHAVE_GETGRGID=1 -DHAVE_GETGRNAM=1 -DHAVE_GETHOSTNAME=1 -DHAVE_GETPGRP=1 -DHAVE_GETPID=1 -DHAVE_GETPPID=1 -DHAVE_GETPWENT=1 -DHAVE_GETPWNAM=1 -DHAVE_GETPWUID=1 -DHAVE_GETTIMEOFDAY=1 -DHAVE_GETUID=1 -DHAVE_GETWD=1 -DHAVE_LINK=1 -DHAVE_LOCALTIME_R=1 -DHAVE_LSTAT=1 -DHAVE_MEMMOVE=1 -DHAVE_MKDIR=1 -DHAVE_MKFIFO=1 -DHAVE_ON_EXIT=1 -DHAVE_PIPE=1 -DHAVE_POLL=1 -DHAVE_PUTENV=1 -DHAVE_READLINK=1 -DHAVE_RENAME=1 -DHAVE_RINDEX=1 -DHAVE_RMDIR=1 -DHAVE_SELECT=1 -DHAVE_SETGRENT=1 -DHAVE_SETPWENT=1 -DHAVE_SETVBUF=1 -DHAVE_SIGACTION=1 -DHAVE_SIGPENDING=1 -DHAVE_SIGPROCMASK=1 -DHAVE_SIGSUSPEND=1 -DHAVE_STAT=1 -DHAVE_STRCASECMP=1 -DHAVE_STRDUP=1 -DHAVE_STRERROR=1 -DHAVE_STRFTIME=1 -DHAVE_STRNCASECMP=1 -DHAVE_STRPTIME=1 -DHAVE_SYMLINK=1 -DHAVE_TEMPNAM=1 -DHAVE_UMASK=1 -DHAVE_UNLINK=1 -DHAVE_USLEEP=1 -DHAVE_VFPRINTF=1 -DHAVE_VSPRINTF=1 -DHAVE_VSNPRINTF=1 -DHAVE_WAITPID=1 -DHAVE_LIBDL=1 -DHAVE_DLOPEN=1 -DHAVE_DLSYM=1 -DHAVE_DLERROR=1 -DHAVE_DLCLOSE=1 -DWITH_DL=1 -DWITH_DYNAMIC_LINKING=1 -DHAVE_TIMEVAL=1 -DHAVE_FINITE=1 -DHAVE_ISNAN=1 -DHAVE_ISINF=1 -DHAVE_ACOSH=1 -DHAVE_ASINH=1 -DHAVE_ATANH=1 -DHAVE_ERF=1 -DHAVE_ERFC=1 -DHAVE_ST_BLKSIZE=1 -DHAVE_ST_BLOCKS=1 -DHAVE_ST_RDEV=1 -DHAVE_TM_ZONE=1 -DHAVE_GR_PASSWD=1 -DEXCEPTION_IN_MATH=1 -DRETSIGTYPE=void -DSYS_SIGLIST_DECLARED=1 -DHAVE_SYS_SIGLIST=1 -DHAVE_POSIX_SIGNALS=1 -DHAVE_GETRUSAGE=1 -DHAVE_TIMES=1 -DGNUPLOT_HAS_MULTIPLOT=1 -DGNUPLOT_HAS_FRAMES=1 -- Javier Perez PIPEBEACH AB Box 240235 SE-104 50 Stockholm, Sweden Mobile: +46 (0)70 488 13 58 Office: +46 (0)8 545 90 990 Fax: +46 (0)8 545 90 993 www.pipebeach.com ------------------------------------------------------------- Octave is freely available under the terms of the GNU GPL. 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