Thanks for your help. I’m basically trying to draw indices from a n-dimensional grid whose sides correspond to some physical parameters. Right now I draw each parameter as some kind of distribution, for instance Normal, and round the value, like you mentioned, either as integer or fractional value which I then use for nearest neighbor or linear interpolation. Sorry, I don’t have a simple code sample to extract.
It works fine but the trace then includes values which are actually not used to calculate the grid value at point. Of course I could always round the values in the trace as well a posteriori, but I was wondering whether it would just be simpler to draw directly these discrete values with a custom distribution.
edit: I could also use Deterministic to save the rounded values but that uses some useful memory.