.. _calculation.logics:

==================
Calculation Logics
==================

Calculation logic defines how a function block processes data within a flowsheet. When configuring a function block or a function block template, you select a logic engine and then define the expression that will be executed each time the block is processed (see :ref:`conf.calc.flowsheet.func.block` and :ref:`conf.calc.funcblocktemp`).

You can choose from the following three logic engines:

- **mXparser**: A mathematical expression parser for defining logic using formula-based syntax. See :ref:`calculation.logics.mxparser`.
- **Python**: Allows you to write logic using Python scripts for more advanced or custom behaviour. See :ref:`calculation.logics.python`.
- **Thermo**: A specialised logic engine available only to certain users. This logic type is not covered in this documentation.



.. seealso::

   - :ref:`calculation.service`
   - :ref:`flowsheet`
   - :ref:`conf.calc.flowsheet.func.block`
   - :ref:`conf.calc.funcblocktemp`


.. toctree::
   :hidden:
   :maxdepth: 5

   calculation.logics.mxparser
   calculation.logics.python