plotyy fails with current graphicshandle nonempty, but having no children

Emil Karlson jkarlson at cc.hut.fi
Tue Nov 18 13:35:16 CST 2008


To: bug at octave.org
Cc: jkarlson at cc.hut.fi
Subject: plotyy fails with current graphicshandle nonempty, but having no children

Bug report for Octave 3.0.3 configured for x86_64-pc-linux-gnu

Description:
-----------

a=1:7; hold on; plotyy(a,a,a,a)

fails

octave:1> a=1:7; hold on; plotyy(a,a,a,a)
error: invalid matrix index = 2
error: evaluating assignment expression near line 83, column 10
error: evaluating if command near line 75, column 5
error: evaluating if command near line 59, column 3
error: called from `plotyy' in file `/usr/share/octave/3.0.3/m/plot/plotyy.m'

Also most use cases of figure fail yyplot.

Fix:
---
This at least fixes the problem for me.

$ diff -u /usr/share/octave/3.0.3/m/plot/plotyy.m plotyy.m
--- /usr/share/octave/3.0.3/m/plot/plotyy.m	2008-11-18 20:40:43.137825000 +0200
+++ plotyy.m	2008-11-18 21:15:11.207329100 +0200
@@ -72,7 +72,7 @@
     endif
   else
     f = get (0, "currentfigure");
-    if (isempty (f))
+    if (isempty(f) || isempty (get(f, "children")))
       ax(1) = axes ();
       ax(2) = axes ();
     else


Configuration (please do not edit this section):
-----------------------------------------------

uname output:     Linux ota 2.6.28-rc4 #2 SMP Mon Nov 10 23:59:59 EET 2008 x86_64 Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz GenuineIntel GNU/Linux
configure opts:   '--prefix=/usr' '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--localstatedir=/var/state/octave' '--enable-shared' '--with-blas=-lblas  ' '--with-lapack=-llapack -lblas  ' '--without-hdf5' '--with-curl' '--with-zlib' '--with-fftw' '--with-umfpack' '--with-colamd' '--with-ccolamd' '--with-cholmod' '--with-cxsparse' '--enable-readline' '--libdir=/usr/lib64' '--build=x86_64-pc-linux-gnu' 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 'CFLAGS=-O2 -pipe -march=native -g -Dliputtassa_emil' 'LDFLAGS=-Wl,--as-needed -Wl,-O1' 'CXXFLAGS=-O2 -pipe -march=native -g -Dliputtassa_emil'
Fortran compiler: x86_64-pc-linux-gnu-gfortran
FFLAGS:           -O
F2C:              @F2C@
F2CFLAGS:         @F2CFLAGS@
FLIBS:            -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. -lz -lgfortranbegin -lgfortran -lm
CPPFLAGS:         
INCFLAGS:         -I. -I. -I./liboctave -I./src -I./libcruft/misc
C compiler:       x86_64-pc-linux-gnu-gcc, version 4.3.2 (Gentoo 4.3.2 p1.0) 
CFLAGS:           -O2 -pipe -march=native -g -Dliputtassa_emil
CPICFLAG:         -fPIC
C++ compiler:     x86_64-pc-linux-gnu-g++, version 4.3.2
CXXFLAGS:         -O2 -pipe -march=native -g -Dliputtassa_emil
CXXPICFLAG:       -fPIC
LD_CXX:           x86_64-pc-linux-gnu-g++
LDFLAGS:          -Wl,--as-needed -Wl,-O1
LIBFLAGS:         -L.
RLD_FLAG:         -Wl,-rpath -Wl,/usr/lib64/octave-3.0.3
BLAS_LIBS:        -llapack -lblas   -lblas  
FFTW_LIBS:        -lfftw3
LIBS:             -lreadline  -lncurses -ldl -lz -lm 
LEXLIB:           
LIBGLOB:          
SED:              /bin/sed
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  -DHAVE_TIMES=1 -DYYTEXT_POINTER=1 -DGNUPLOT_BINARY="gnuplot"

User-preferences (please do not edit this section):
--------------------------------------------------

  EDITOR = /usr/bin/vim
  EXEC_PATH = /usr/libexec/octave/3.0.3/site/exec/x86_64-pc-linux-gnu:/usr/libexec/octave/api-v32/site/exec/x86_64-pc-linux-gnu:/usr/libexec/octave/site/exec/x86_64-pc-linux-gnu:/usr/libexec/octave/3.0.3/exec/x86_64-pc-linux-gnu:/usr/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.3.2:/usr/kde/3.5/bin:/usr/qt/3/bin:/usr/games/bin:/home/jkarlson/tyo/bin/
  IMAGE_PATH = .:/usr/share/octave/3.0.3/imagelib
  PAGER = /usr/bin/less
  PS1 = \s:\#> 
  PS2 = > 
  PS4 = + 
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  crash_dumps_octave_core = 1
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  gnuplot_binary = gnuplot
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  gnuplot_command_plot = pl
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  gnuplot_command_splot = sp
  gnuplot_command_title = t
  gnuplot_command_using = u
  gnuplot_command_with = w
  history_file = /home/jkarlson/.octave_hist
  history_size = 1024
  ignore_function_time_stamp = system
  info_file = /usr/share/info/octave.info
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