Answers from the glpk function are rounded off, which results in incorrect output.
Romeo Victor Dellarocco
della1rv at gmail.com
Sun Jan 11 23:06:34 CST 2009
--------
Bug report for Octave 2.9.12 configured for i486-pc-linux-gnu
Description:
-----------
Answers from the glpk function are rounded off,
which results in incorrect output.
I tried to solve this simple minimization problem using the glpk
function:
var x >= 0 ;
var y >= 0 ;
minimize p: 180*x + 160*y ;
s.t. hq : 6*x + y >= 12 ;
s.t. mq : 3*x + y >= 8 ;
s.t. lq : 4*x + 6*y >= 24 ;
end;
I use the input file 'mines.oct', which I run through octave, which
generates the results in 'mines.oct.out'.
#$ octave -q < mines.oct > mines.oct.out
The problem is that octave prints out rounded numbers, for example:
---
xopt =
1.5000 # should be ~ 1.71
3.0000 # should be ~ 2.86
---
I think that the correct answers are produced by the glpk lib, as
'glpksol -m mines.glpk' produces correct results in 'mines.glpk.out'.
# glpksol -m mines.glpk -o mines.glpk.out
Is there a way to keep the results from being rounded?
Repeat-By:
---------
#$ octave -q < mines.oct > mines.oct.out
Fix:
---
Use glpksol :(
Configuration (please do not edit this section):
-----------------------------------------------
uname output: Linux romulus 2.6.22-16-rt #1 SMP PREEMPT RT Mon Nov 24
21:03:25 GMT 2008 i686 GNU/Linux
configure opts: '--prefix=/usr' '--datadir=/usr/share' '--libdir=/usr/lib'
'--libexecdir=/usr/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-blas=-lblas-3' '--with-lapack=-llapack-3'
'--with-hdf5' '--with-fftw' '--with-f77=/usr/bin/g77' '--enable-shared'
'--enable-rpath' '--disable-static' '--build' 'i486-linux-gnu'
'build_alias=i486-linux-gnu' 'CC=/usr/bin/gcc' 'CXX=/usr/bin/g++'
'F77=/usr/bin/g77'
Fortran compiler: /usr/bin/g77
FFLAGS: -O2
F2C:
F2CFLAGS:
FLIBS: -L/usr/lib/gcc/i486-linux-gnu/3.4.6
-L/usr/lib/gcc/i486-linux-gnu/3.4.6/../../../../lib
-L/usr/lib/gcc/i486-linux-gnu/3.4.6/../../.. -L/lib/../lib -L/usr/lib/../lib
-lhdf5 -lz -lfrtbegin -lg2c -lm
CPPFLAGS:
INCFLAGS: -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler: /usr/bin/gcc, version 4.1.3 20070812 (prerelease) (Ubuntu
4.1.2-15ubuntu2)
CFLAGS: -O2
CPICFLAG: -fPIC
C++ compiler: /usr/bin/g++, version 4.1.3
CXXFLAGS: -O2
CXXPICFLAG: -fPIC
LD_CXX: /usr/bin/g++
LDFLAGS: -s
LIBFLAGS: -L.
RLD_FLAG: -Wl,-rpath -Wl,/usr/lib/octave-2.9.12
BLAS_LIBS: -llapack-3 -lblas-3
FFTW_LIBS: -lfftw3
LIBS: -lreadline -lncurses -ldl -lhdf5 -lz -lm
LEXLIB:
LIBDLFCN:
LIBGLOB:
SED: /bin/sed
DEFS:
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-DHAVE_STRUCT_STAT_ST_BLKSIZE=1 -DHAVE_STRUCT_STAT_ST_BLOCKS=1
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-DGNUPLOT_BINARY="gnuplot" -DGNUPLOT_HAS_FRAMES=
User-preferences (please do not edit this section):
--------------------------------------------------
EDITOR = emacs
EXEC_PATH =
/usr/lib/octave/2.9.12/site/exec/i486-pc-linux-gnu:/usr/lib/octave/api-v24/site/exec/i486-pc-linux-gnu:/usr/lib/octave/site/exec/i486-pc-linux-gnu:/usr/lib/octave/2.9.12/exec/i486-pc-linux-gnu:/usr/bin:/home/romeo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
IMAGE_PATH = .:/usr/share/octave/2.9.12/imagelib
PAGER = pager
PS1 = \s:\#>
PS2 = >
PS4 = +
beep_on_error = 0
completion_append_char =
crash_dumps_octave_core = 1
echo_executing_commands = 0
fixed_point_format = 0
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gnuplot_command_end =
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gnuplot_command_replot = rep
gnuplot_command_splot = sp
gnuplot_command_title = t
gnuplot_command_using = u
gnuplot_command_with = w
history_file = /home/romeo/.octave_hist
history_size = 1024
ignore_function_time_stamp = system
info_file = /usr/share/info/octave2.9.info
info_program = info
makeinfo_program = makeinfo
max_recursion_depth = 256
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