Generato

Generate C/C++ Code from Tensor Expression and So On

Pre-Requisites

• Install free Wolfram Engine for Devolopers from https://www.wolfram.com/developer/. (If you are rich, you can install the totally worth-it Mathematica instead, versions that support wolframscript.)

• Download xAct from http://www.xact.es and install it properly.

Installation

• clone repo: git clone https://github.com/lwJi/Generato.git

• set enviroment variable: export GENERATO="/your/repo/path"

Example

• Small toy

cd test/CarpetX

Generato test.wl

• GHG formulation of Einstein's equations

Please take a look at the example script for GHG system: test/Nmesh/GHG_rhs.ipynb. Or

cd test/Nmesh

Generato GHG_rhs.wl

Recomendations

• Use lower case to name variables (to aviod conflict with say Pi)

Tips

• Use SetEQNDelayed if your right-hand side (rhs) includes an If statement to handle different component cases. Otherwise, SetEQN is preferred because it has an option, CheckRHS, which checks if all the terms appearing in the rhs are well-defined.

• IsDefined[term] is very useful for debugging.