Error: Singular MatrixSolution Number: 953 Versions: All versions
What does the error message "Singular Matrix" mean? The problem is that the stiffness matrix of the linear system is singular and the linear solver cannot invert it. Examples of practical modeling situations where this ...
Troubleshooting graphics issuesSolution Number: 933 Versions: All versions
Chances are that there is a graphics rendering problem if any of these symptoms show up: The graphics window is black It is not possible to mouse-select objects in the graphics window The COMSOL application crashes ...
Handling large modelsSolution Number: 830 Versions: All versions
Models with many domains, boundaries, and physics features are slow to work with. Large models can contain hundreds or even thousands of domains, boundaries, and physics features. Such a large number of features ...
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Learning Center ResourcesLearn how to use the COMSOL Multiphysics® software for modeling devices, designs, and processes. Access the Learning Center courses and articles below for modeling guidelines, step-by-step demonstrations, and exercise files.
Examples of the General Extrusion Operator
Examples of the General Projection Operator
Integrating Along Streamlines and Extracting Particle Statistics
Copying and Reusing Boundary Mode Analysis Results
Modeling TEM and Quasi-TEM Transmission Lines
Examples of the withsol Operator
Applying Translations, Scaling, Reflection, and Rotation via the Deformed Geometry and Moving Mesh Interfaces