Re: Seg fault with test_sparse.m

[Quentin Spencer]

Joe Koski wrote:
> Hi all,
>
> After getting a successful build of octave-2.9.7 on my Mac G5 with OS X
> 10.4.7, Xcode tools 2.3 (gcc-4.0.1) and gfortran, I installed dejaGNU and
> ran make check. I got one IO error, but things were going well until I hit
> test_sparse. There I got a seg fault. I have attached the terminal output
> and fntest.log output in case you want to see them.
>
> I then moved to the test directory and ran octave. Here's what I got:
>
> octave:1> test_sparse
> writing test output to sptest.log
>   
> > > > > > /Tools/octave-2.9.7/test/test_sparse.m
> > > > > >             
> warning: Calculating Sparse Matrix Type
> panic: Bus error -- stopping myself...
> Bus error
> Joe-Koskis-Computer:/Tools/octave-2.9.7/test jakoski$
>
> I have also attached the sptest.log for your information.
>
> To my untrained eye, the script seems to be running through quite a few
> tests before the failure. Things are almost working.
>
> Anyway, I'll be available to try things, but maybe it's time for someone
> with sparse matrix knowledge (definitely not me) to try this on a Mac. I'll
> be available to assist anyone who wants to try building octave-2.9.7 or
> later on a Mac under OS X 10.4. I can cut many hours from the build process
> with my experience from the last few days.
>   

I just tried the sparse tests (Fedora 5 system) and I am seeing 3 
failures out of 1176. I'm not getting segfaults, but I haven't looked 
any further to see what the errors are.

> The other problem that I have is with the legend.m routine in octave-forge.
> The problem is persistent with any script that uses legend. As I said, I can
> file a bug report, if it is an unknown problem.
>   

The last release of octave-forge does have a bug in legend. I've checked 
the fix into CVS, but I'm attaching the patch.

Quentin

Index: main/plot/legend.m
===================================================================
RCS file: /cvsroot/octave/octave-forge/main/plot/legend.m,v
retrieving revision 1.16
diff -u -r1.16 legend.m
--- main/plot/legend.m  14 Apr 2006 12:51:14 -0000      1.16
+++ main/plot/legend.m  11 Jul 2006 16:09:07 -0000
@@ -195,7 +195,8 @@
   shell_cmd=["grep \"^", gnuplot_command_plot, " \" '", tmpfilename, "' | ", \
              "sed -e 's/,/ , /g' -e 's/\"/ \" /g'", " | ", \
              "awk '", awk_prog, "'"];
-  [status, plot_cmd] = split(system(shell_cmd),"\n");
+  [status, output] = system(shell_cmd);
+  plot_cmd = split(output,"\n");
 
   # Remove state file and sync file