simulation takes hours to run. ''variable appears to change size on every loop iteration( within a script). how do I preallocate for speed please?

simulation takes hours to run. It says ''variable appears to change size on every loop iteration( within a script). how do I preallocate for speed please? Thanks

Answer 1

[Torsten]

Preallocate it with the largest possible size. But if the simulation takes hours, I doubt the missing preallocation is the bottleneck.