Search code examples
rvegan

Configuring max iterations in metaMDS

I´m trying ro reduce the iterations of metaMDS (vegan library) to 1, but it does not work. Here I add an example code

Please help

library(vegan)
metaMDS(dune, trymax = 1)
Solution

  • You have to give both trymax and try. There is a reason to make this difficult, but try:

    metaMDS(dune, trymax=1, try=1)

    The documentation says that try and trymax are the minimum and maximum numbers of random starts, and both default to 20. Both must be at the same value to force a fixed number. If you only have trymax=1, the minimum will still default to try=20 unless you change it.

    Currently the logic is to work try times and first then check if trymax was reached. I could change it, naturally, but I'm not sure it is good not to try hard enough. You seem to suppose an opposite strategy. It seems that I did this in 2016, and then this sounded like a good idea. I'm open to suggestions.