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LiveLink "selection.set"
Posted Oct 14, 2010, 9:36 p.m. EDT LiveLink for MATLAB Version 4.3a 5 Replies
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I'm having what I believe to be a pretty straightforward problem getting the selection.set function to work properly. I am learning LiveLink by building up a model step by step, exporting to an m file at every step and keeping the parts of the script I need. For some reason, playing back any commands which require me to set a selection do not work (even if I did not modify them at all after export). For example:
model.physics('es').selection.set([1]);
Here is the error I get in matlab (where the illegal input vector is, I believe, the key part):
??? Java exception occurred:
Exception:
java.lang.IllegalArgumentException: Illegal input vector
(rethrown as com.comsol.util.exceptions.FlException)
Messages:
Illegal input vector
Stack trace:
at com.comsol.model.impl.SelectionImpl.a(Unknown Source)
at com.comsol.model.impl.SelectionImpl$b.a(Unknown Source)
at com.comsol.model.impl.SelectionImpl$b.execute(Unknown Source)
at com.comsol.model.clientserver.ClientManagerImpl$d.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Error in ==> scratch_10142010 at 111
model.physics('es').selection.set([1 2 3]);
As a side note, how does Comsol number the domains that are created from the various geometry operations? If I were writing this code 'blind' how would I know how to select domains, boundaries, etc..
Thanks, Mike
Hello Michael Norton
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i have exactly the same problem and i dont understand why it occurs, have you found a solution?
Regards,
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Did you remember to call run on the geometry?
You should have something like this:
model.geom('geom1').run
Comsol only identifies geometric entity numbers after the geometry has been finalized, which happen if you call the run method (and not when you use the runAll method).
If you did call the run method and still sees this problem (and you are certain that you have three domains) then send the model to support.
Finding out what domain number Comsol uses can be tricky. In the LiveLink for MATLAB that is released with Comsol 4.1 you have two functions mphselectbox and mphselectcoords that can be used to identify domains, boundaries, edges and points numbers based on their coordinates.
In Comsol 4.2 there are even more advanced selection methods built into Comsol.
Lars Gregersen
Comsol Denmark
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Using "Clear all solutions" from the menu solved the problem. Maybe you also have an old solution in your model?
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It is quite confusing that the introduction has not been updated, because I have exactly the same problem with Comsol 4.3a when following the LiveLink Introduction.
LiveLink™ for MATLAB® > Introduction to LiveLink™ for MATLAB® > A Thorough Example: The Busbar
Selections
sel1 = model.selection.create('sel1');
sel1.set([2 3 4 5 6 7]);
sel1.name('Ti bolts');
cheers,
Nicolas
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I had the same problem and it came from the geometry.
When you have build your geometry, you must run it.
"model.geom('geom1').run;"
On this way, you can select what you want.
I hope it helped.