[R] Explore patterns with GAM

[spyros]

Dear all,
I new to r and I would like your help. 
I want to explore the patterns (unimodal, monotonically increased/decreased)
of species richness~altitude using GAM in R. Although I run the gam function
in mgcv package I do not know how to manually define knots and degrees of
freedom.
Any help would be greatly appreciated.
Spyros  



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