Direct serendipity

Before trying this example, you must install Symfem:

pip3 install symfem

This element can then be created with the following lines of Python:

import symfem

# Create direct serendipity order 1 on a quadrilateral
element = symfem.create_element("quadrilateral", "direct serendipity", 1)

# Create direct serendipity order 2 on a quadrilateral
element = symfem.create_element("quadrilateral", "direct serendipity", 2)

# Create direct serendipity order 3 on a quadrilateral
element = symfem.create_element("quadrilateral", "direct serendipity", 3)

Before trying this example, you must install UFL:

pip3 install UFL

This element can then be created with the following lines of Python:

import ufl

# Create direct serendipity order 1 on a quadrilateral
element = ufl.FiniteElement("Sdirect", "quadrilateral", 1)

# Create direct serendipity order 2 on a quadrilateral
element = ufl.FiniteElement("Sdirect", "quadrilateral", 2)

# Create direct serendipity order 3 on a quadrilateral
element = ufl.FiniteElement("Sdirect", "quadrilateral", 3)