Construction of a subset of data for evaluation

[nvxModel]

Hi everybody!

I am trying to divide my dataset randomly into two parts to keep some data for evaluation. I'm working with R and I can't figure out how to do it. I guess I am not the only one who tried to do something like that, so could you help me please?

So far, I have one Spatvector with my presence data.
I can subset one part with sample(Spatdata, 200)
But how to proceed then? I tried with setdiff(Spatdata, Sample) but it doesn't work.

Thank you very much!

Nvx

[nvxModel]

Well, I'll answer to my own question because I found a solution and it might help someone someday.

My_var <- vect(".")
My_var[['ID']] <- 1:nrow(My_var)
My_var_evaluation <- sample(My_var, 200)
'%notin%' <- Negate('%in%')
Myresp <- subset(My_var, My_var$ID %notin% My_var_evaluation$ID)