** Single 2D plane-strain quadrilateral element, subjected to sinusoidal base shaking**

1. **Tcl Code**

   .. literalinclude:: PressureIndependentMultiYieldExample1.tcl
      :language: tcl

2. **Python Code**

3. **Matlab Code**

   .. literalinclude:: PressureIndependentMultiYieldExample1.m
      :language: matlab