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Using Comsol Java API to Evaluate Expression at Arbitrary Point

Posted Dec 1, 2023, 9:18 a.m. EST Interfacing, API, Results & Visualization 1 Reply

PatrickKy
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I am using the Java API to do some results post-processing on an electrostatics study. I came to a point in which I need to interpolate value of the electric potential at some specific point, but I cannot seem to find how to do that from the Java API documentation (alternative link)

In MATLAB Comsol, there is a function mphinterp which does exactly what I want. How can I replicate this functionality in my Java code?

Is it even possible to do that with the Java API only?

P.S. I am doing some optimization in the Java code, which is performance sensitive, which is why I cannot use Matlab mphinterp.

1 Reply Last Post Dec 4, 2023, 3:48 a.m. EST
Gunnar Andersson COMSOL Employee

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Posted: 1 year ago Dec 4, 2023, 3:48 a.m. EST
Updated: 1 year ago Dec 4, 2023, 6:53 a.m. EST

You can use the Interp numerical evaluation feature, see page 529 in your first link to the documentation. I think that this is what the mphinterp MATLAB function does.

Example: To evaluate the expression "my_expr" at x=0.5 in domain 1 in a 1D model, do as follows:

  • NumericalFeature ev = m.result().numerical().create("interp","Interp");
  • ev.selection().geom(1);
  • ev.selection().set(1);
  • ev.set("edim", 1);
  • ev.set("expr"," "my_expr");
  • ev.set("coord", new double[]{0.5});
  • double[][][] data = ev.getData();
You can use the Interp numerical evaluation feature, see page 529 in your first link to the documentation. I think that this is what the mphinterp MATLAB function does. Example: To evaluate the expression "my_expr" at x=0.5 in domain 1 in a 1D model, do as follows: * NumericalFeature ev = m.result().numerical().create("interp","Interp"); * ev.selection().geom(1); * ev.selection().set(1); * ev.set("edim", 1); * ev.set("expr"," "my_expr"); * ev.set("coord", new double[]{0.5}); * double[][][] data = ev.getData();

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