Re: [Plplot-devel] Java changes to support plsurf3d()

[<jc...@fe...>]

On Tuesday 15 October 2002 02:23, Alan W. Irwin wrote:
| On Mon, 14 Oct 2002, [iso-8859-1] Jo=E3o Cardoso wrote:
| > I will not make changes to python. Can someone please made the
| > necessary changes?
|
| OK, you aroused my curiosity, I wanted to encourage all the neat
| stuff you have been doing, and I also needed a quick break from my
| research in any case....;-)
|
| I just completed the python changes.  The easy part was the API
| change using swig.  The tough part was tracking down the remaining
| inconsistencies between the C, tcl, and python examples 8.
|
| In both the C and python examples, the second plot (ifshade =3D=3D 1
| which uses the new plmesh) has a blue edge that should not be there.=20
| The tcl example 8 does not have this problem.

So it must be a tcl problem :-)!
I also noticed it but I have no clue on what is causing it.

|  Other non-visual
| differences between the examples also show up for ifshade =3D=3D 5.

What differences?

|  All
| other ifshade values have no differences.
|
| I suspected some memory management problem in the underlying plmesh
| code for the ifshade =3D=3D 1 differences and sure enough
|
| valgrind ./x08c -dev xwin
|
| does show a lot of problems, e.g.,
|
| Conditional jump or move depends on uninitialised value(s)
| Use of uninitialised value of size 8
|
| which were not there before the last time I ran valgrind on example
| 8.
|
| Joao, could you follow up on this please?

OK, I will try to correct the problems as soon as I can.

Joao

|  There is a nice mode in
| valgrind to leap right to a gdb session whenever a memory management
| problem occurs which saves an awful lot of gdb session time executing
| all the correct parts of the code until the error is reached.  The
| gdb hook from valgrind only works if you use the -g compile option
| (which you can get with the --with-debug option to ./configure). The
| -g option also allows valgrind to put line numbers in its output.=20
| The last time I used valgrind this way it only took me about 10
| minutes to track down the problem, but I am leaving it to you
| (please), because again I am out of time, and not at all familiar
| with your recent code changes.
|
| Alan
|
|
|
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