The <sub> block is equivalent to the “-” operator in Python; it allows you to subtract “b” from “a”.
See the Python documentation for more details.
•« a » : The default value is 0 (type: int)
•« b » : The default value is 0 (type: int)
•« out » : Its type depends on the type of the inputs
The inputs must be of type: int, float, or complex.