Problem with saving table in a method

Posted Apr 25, 2025, 10:46 a.m. EDT Version 6.3 2 Replies

Tobias Zeller

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Hi everyone, I'm currently working on creating small scripts using methods in the Application Builder to simplify the export of data in the Model Builder. I call the equivalent method in the Model Builder to get it running.

Right now, I'm trying to save a table using the following script and ran into two issues:

model.result().evaluationGroup().create("eg10", "EvaluationGroup"); model.result().evaluationGroup("eg10").set("data", "dset1"); model.result().evaluationGroup("eg10").label("Iron Losses"); model.result().evaluationGroup("eg10").create("int1", "IntSurface"); model.result().evaluationGroup("eg10").feature("int1").label("Surface Iron Losses"); model.result().evaluationGroup("eg10").feature("int1").set("intvolume", true); model.result().evaluationGroup("eg10").feature("int1").selection().named("sel15"); model.result().evaluationGroup("eg10").feature("int1").set("expr", new String[]{"rmm.Qh"}); model.result().evaluationGroup("eg10").feature("int1").set("descr", new String[]{"Volumetric loss density, electromagnetic"}); model.result().evaluationGroup("eg10").feature("int1").set("unit", new String[]{"W/m"}); model.result().evaluationGroup("eg10").feature("int1").setIndex("expr", "rmm.Qh*L", 0); model.result().evaluationGroup("eg10").feature("int1").setIndex("descr", "P_iron_MOD", 0); model.result().evaluationGroup("eg10").run();
//model.result().evaluationGroup("eg10").save("Z:\Simulationsergebnisse\Iron_losses.txt");
//model.result().evaluationGroup("eg10").save("C:\Users\kzt\Documents\Iron_losses.txt");
//model.result().evaluationGroup("eg10").save("C:\Temp\Iron_losses.txt");

1.) Everything works fine up to the last commented-out line. Unfortunately, I can’t save to any of the specified directories and I always get the following error:

"Cannot open file for writing. - Filename: Z:\Simulationsergebnisse\Iron_losses.txt (with all the other paths as well) - Table: Iron Losses"

However, I can manually save to the paths via mouse click.

2.) Is there an alternative to the following line?

"model.result().evaluationGroup("eg10").feature("int1").selection().named("sel15");"

I’d like to use the name of the selection instead of the index number 15. When I add or remove selections, the index changes, so "15" may no longer refer to the correct selection.

Best regards and many thanks in advance for your help!

Tobias Zeller

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2 Replies Last Post Apr 29, 2025, 5:07 a.m. EDT

Gunnar Andersson COMSOL Employee

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Posted: 6 hours ago

For security reasons, methods by default have limited access to the file system. You can change this in Preferences > Methods and Java Libraries > File system access.
The argument to selection().named() is the tag of a selection. This is the tag that you used when creating the selection (or was it created for you at some point)? In the former case, you can store the selection a variable, let's call it SEL, and pass SEL.tag() as argument to selection().named().

Tobias Zeller

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Posted: 3 hours ago

For security reasons, methods by default have limited access to the file system. You can change this in Preferences > Methods and Java Libraries > File system access.

The argument to selection().named() is the tag of a selection. This is the tag that you used when creating the selection (or was it created for you at some point)? In the former case, you can store the selection a variable, let's call it SEL, and pass SEL.tag() as argument to selection().named().

Dear Mr. Andersson, First of all, thank you very much for your reply. Unfortunately, I still have one remaining question.

I’m not entirely sure how to interpret your answer. Is the tag the same as the label?

In my case, I have nearly 20 different selections (see attachment), and “sel15,” which is the 15th selection, is the one I need. If the label is not the tag, is there a way to change or view the tag of a selection? Additionally, when I create a new explicit selection, I don’t see an option for assigning a "tag."

If I determine my tag name—for example, if the tag name is “test”—what would my code look like? Would it be something like this? "model.result().evaluationGroup("eg10").feature("int1").selection().test.tag();"

Best regards and thanks a lot Tobias Zeller

Attachments:

Selections.png

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