Thanks. I hadn't known that some packages need to be explicitly
loaded even after they are installed. Once I loaded them, I got
results from
> demo MSH2Mjigglemesh
I also added gmsh to my path. Now, as I understood the previous
note, the demo above does not use gmsh. So, if I look over the
commands in that demo, I will not be seeing examples of what is
possible using gmsh. Are there examples/demos for full-blown use of
msh/fpl? Is there documentation available somewhere?
Thanks.
Thomas Scofield
On Jun 17, 2009, at 3:55 PM, Carlo de Falco wrote:
On 17 Jun 2009, at 20:02, Thomas L. Scofield wrote:
I will be teaching introductory pdes in the fall at my institution
(Calvin College). I have done so before, about 3 years ago, and
used Octave as the software package for the course. At that time,
there was a "package" (don't recall if it was available through
the octave-forge site, but think probably not) which, though out
of date at the time and requiring a separate executable to
generate the mesh, was adequate for teaching rudimentary finite
element methods.
I was excited to see that there are packages, namely fpl and msh,
now available through octave-forge, which may be more up-to-date
and easier to use.
You might also want to have a look at "bim" which can be used to
solve simple elliptic equatioons in 1, 2 and 3d with piece-wise
linear continuous finite elements
I installed both by first downloading the zipped tarballs and
then running
> pkg install ...
I had not first noted the dependence upon gmsh. Anyway, the "pkg
install" command above produced no errors for either package, so I
thought everything was fine. Even with the dependence upon gmsh,
I am unsure why things like
> help MSH3Mgmsh
produce the message
help: `MSH3Mgmsh' not found
To avoid crowding up Octave's name space some packages are
configured to not be loaded automatically at startup, 'msh' 'fpl'
and 'bim' are among those.
Before you can use the functions from msh you need to do
pkg load msh
I have since gone and got gmsh. Since I am working on a Mac, the
best way seemed via a disk image (.dmg) file which, when mounted,
gave me Gmsh.app, which I could drag into my applications folder.
Now I can run Gmsh. What I do not have, however, is the ability
to run gmsh from a terminal (could probably set that up with an
alias), if that matters.
Yes, it does matter the command 'gmsh' must be in the path for
Octave to be able to use it.
If you have installed version 2.3.1 of Gmsh.app in /Applications
you can achieve this by adding the line:
PATH="${PATH}:/Applications/gmsh-2.3.1/Gmsh.app/Contents/MacOS/"
to the file .bash_login (or .bashrc) in your home directory
Is there some "switch", amounting to "which gmsh", that is
checked at the time these packages are installed and, when it
fails, keeps the package from being installed? That would seem
quite strange in light of the fact that
No, if gmsh is not available msh can still be used for other
things, e.g. to create structured meshes and to apply some simple
mesh transformations, try for example
demo MSH2Mjigglemesh
therefore msh does not refuse to install or run if gmsh is not
available.
> pkg list
lists both fpl and msh as 'installed'.
as I said before these packages need not only be installed but also
loaded,
when they are loaded they will show a '*' beside their name:
>> pkg list
Package Name | Version | Installation directory
--------------+---------+-----------------------
bim | 0.1.1 | /Users/carlo/octave/bim-0.1.1
fpl | 0.1.6 | /Users/carlo/octave/fpl-0.1.6
integration | 1.0.7 | /Users/carlo/octave/integration-1.0.7
msh | 0.1.1 | /Users/carlo/octave/msh-0.1.1
nurbs | 1.0.1 | /Users/carlo/octave/nurbs-1.0.1
splines | 1.0.7 | /Users/carlo/octave/splines-1.0.7
>> pkg load msh
>> pkg list
Package Name | Version | Installation directory
--------------+---------+-----------------------
bim | 0.1.1 | /Users/carlo/octave/bim-0.1.1
fpl | 0.1.6 | /Users/carlo/octave/fpl-0.1.6
integration | 1.0.7 | /Users/carlo/octave/integration-1.0.7
msh *| 0.1.1 | /Users/carlo/octave/msh-0.1.1
nurbs | 1.0.1 | /Users/carlo/octave/nurbs-1.0.1
splines *| 1.0.7 | /Users/carlo/octave/splines-1.0.7
>>
Thomas L. Scofield
HTH,
c.
Thomas L. Scofield
--------------------------------------------------------
Associate Professor
Department of Mathematics and Statistics
Calvin College
--------------------------------------------------------
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