Direct serendipity

Before running 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 degree 1 on a quadrilateral
element = symfem.create_element("quadrilateral", "direct serendipity", 1)

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

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