I’m trying to solve the system of equations where for one of the functions (actually velocity vector) I got values calculated outside FF.

To simplify lets imagine I’ve rectangular mesh size 10x20 and got file with vector values in some points (1,1; 1,2; 1,3 etc at regular intervals) but these points were generated outside FF and are totally not connected with mesh points so typical *ifstream fileRead…* won’t work in my case.

I can load these values as a list/array but I have no idea how to transform into function using points’ coordinates on a mesh.

Is there any cleaver way to define such external function in FF?

Hope that description was clear.