[Users] Grid function timelevels

[Jens Mahlmann]

Dear all,

I am currently optimizing some code in the Einstein Toolkit and have a 
general question on time levels and declarations.

Throughout my evolution, I use some quantities (initialized as grid 
functions with various time levels) which are not changed throughout the 
evolution or only changed explicitly in some moments. At the moment, I 
make sure in every time step via

variable[i3D] = variable_p[i3D]

that I have the correct values at the respective time.

Is there a better way to do this? I.e. is there a way to declare a grid 
function or to register it such that it stays untouched throughout the 
time evolution except when I change it explicitly?

Thank you very much and my best from Valencia

Jens Mahlmann