[R] $ opetator is invalid for atomic vectors

[Rui Barradas]

Hello,

Please cc the list.
Yes, I believe so, it's hard to say, the code is not reproducible.
But that's what the docs say. Why not try it?

Hope this helps,

Rui Barradas

Às 16:00 de 24/02/20, javed khan escreveu:
> 
> Thanks for your feedback Rui.. It means I have to specify the "mod" in 
> the resamples (based on the code below) instead of ga_res?  mod here is 
> the train function of caret?
> 
> resamples(list( First_data= mod, Second_data=mod2)
> 
> My sample code is here
> 
> obj <- function(param, maximize = FALSE) {
>    print(param)
>    mod <- train(Result ~ ., data = tr,
>                 method = "gbm",
>                 metric = "MAE",
>                 trControl = ctrl
>                                     tuneGrid = data.frame(n.trees = 
> (param[1]), interaction.depth = (param[2]),
>                                  shrinkage=(param[3]), 
> n.minobsinnode=(param[4])))
> 
>                  if(maximize)
>      -getTrainPerf(mod)[, "TrainMAE"] else
>        getTrainPerf(mod)[, "TrainMAE"]
> }
> 
> Then GA function
> 
> library(GA)
> set.seed(45642)
> ga_res <- ga(type = "real-valued",
>               fitness = svm_obj,
>               min = c(0.5,0), max = c(1,1),
> 
>               maxiter = ceiling(num_mods),
>               maximize = TRUE)
> ga_res using solution
> 
> On Mon, Feb 24, 2020 at 2:03 PM Rui Barradas <ruipbarradas using sapo.pt 
> <mailto:ruipbarradas using sapo.pt>> wrote:
> 
>     Hello,
> 
>     If you are using function resamples from package caret, just read its
>     help page. From ?resamples, section Arguments:
> 
>     Arguments
> 
>     x
>     a list of two or more objects of class train, sbf or rfe with a common
>     set of resampling indices in the control object. For sort.resamples, it
>     is an object generated by resamples.
> 
> 
>     Your x argument is not an object of one of those classes. You are
>     passing the function a list of 2 numeric values, not an object
>     resembling the examples in that help page.
> 
> 
>     Hope this helps,
> 
>     Rui Barradas
> 
> 
>     Às 11:35 de 24/02/20, javed khan escreveu:
>      > Hello
>      >
>      > I am using genetic algorithm for some optimization problem. I
>     executed it
>      > with 2 types of data and get results like
>      >
>      > GA=40
>      > GA2=60
>      >
>      > When I combine it with resamples
>      >
>      > Value=resamples (list (GA, GA2))
>      >
>      > It gives me the error
>      >
>      > $ operator is invalid for atomic vectors.
>      >
>      > What should be the issue here?
>      >
>      > Thanks
>      >
>      >       [[alternative HTML version deleted]]
>      >
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