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User:Andy1978: Difference between revisions
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mtimes(num2cell(m,[1,2]){:}) | mtimes(num2cell(m,[1,2]){:}) | ||
mtimes(s{:}) | mtimes(s{:}) | ||
== Tracking octave bugs with hg bisect== | |||
I had a strange problem when loading gzip compressed ascii files in octave. It failed dependent on the integer values. After some stripping I made a minimalistic test script (min_testcase_fails.m) which always fails in a current dev (88616c872933): | |||
fn="file2.txt" | |||
fid = fopen (fn,"w"); | |||
fprintf(fid, "%i %i %i %i\n",639, 25, 160, 978160); | |||
fprintf(fid, "%i %i %i %i\n",687, 25, 171, 978160); | |||
fprintf(fid, "%i %i %i %i\n",663, 31, 173, 978161); | |||
fprintf(fid, "%i %i %i %i\n",663, 15, 154, 978161); | |||
fprintf(fid, "%i %i %i %i\n",655, 21, 151, 978161); | |||
fclose(fid); | |||
## gzip it! | |||
fn_gz=strcat(fn, ".gz"); | |||
cmd=cstrcat("gzip ",fn," -c > ",fn_gz) | |||
system(cmd); | |||
c=load("file2.txt.gz") #this fails in newer versions | |||
If line 4 with "663, 15, 154, 978161" is changed to ""663, 16, 154, 978161", load works as expected. '''Strange, isn't it?''' | |||
I also had an old build (dev ab1c6e6d1be6 from Sun Oct 28 21:48:02 2012) and "load" worked in this version. | |||
=== Running bisect === | |||
I decided to make a fresh clone in a separate directory: | |||
cd ~/src | |||
hg clone http://www.octave.org/hg/octave octave-src | |||
cd octave-src | |||
hg bisect -b 88616c872933 | |||
hg bisect -g ab1c6e6d1be6 | |||
After this hg bisect uses a binary search strategy to test revisions: | |||
Teste Änderungssatz 16428:f016a5342e19 (1380 Änderungssätze verbleiben, ~10 Tests) | |||
So after checkout I had to compile the source tree (used ccache in the hope of faster checkout-compile cycles). | |||
./bootstrap | |||
cd .. && mkdir octave-build | |||
export CXX="ccache g++" | |||
export CC="ccache gcc" | |||
../octave/configure | |||
make -j 7 | |||
After compilation I tried my testscript min_testcase_fails.m: | |||
./run-octave -q ../min_testcase_fails.m | |||
cd .. | |||
cd octave | |||
hg bisect -g | |||
I used [http://jordi.platinum.linux.pl/tmp/bisect-32818.sh Jordis bisect script for bug 32818] and modified it to my needs: | |||