Obtaining Model Information
Modifying an existing model object requires you to know how the model is set up. Some functions help you to access this information so that you can add or remove a model feature, or modify the value of an existing property. The function mphnavigator helps you to retrieve model object information. Calling mphnavigator at the MATLAB prompt displays a summary of the features and their properties for the model object available in the MATLAB workspace.
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Start COMSOL with MATLAB.
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Load the busbar example model:
mphopen busbar
Alternatively, use this more advanced form of the command if you wish to use another variable name than model:
model = mphopen('busbar');
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To access the model information, enter the following command at the MATLAB prompt:
mphnavigator
In the mphnavigator graphical user interface, the model nodes are listed under the Model Tree section. The nodes can be expanded to access the subnodes. When a node is selected in the Model Tree, its properties are listed in the Properties section. The Methods section lists the methods available for the selected node. Just above the Methods section, you can see the COMSOL API syntax that lead to the feature. The Copy button copies the API syntax of the command to the system clipboard.
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In the Model Tree, expand the model nodes down to geom>geom1>wp1>r1 and select the node r1.
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To get the command to access Rectangle 1 in MATLAB, under the Model Tree click Copy. Then select the MATLAB prompt and press CTRL+V keys.
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In the Model Object Navigator, Properties section, you can see the that the lx property of the geometry feature r1 is set to L+2*tbb, which represents the length of the rectangle. The width of the rectangle, represented with the property ly, is set to 0.1.
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To get the command to set the value of a property, for instance lx, click on the property in the Model Object Navigator and then click Copy set.
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Go back to MATLAB and press CTRL+V keys. In the newly pasted command, you can now change the value of the property by replacing the expression L+2*tbb by the desired value.