[R] randomForest, 'No forest component...' error while calling Predict()

[Jim_S]

Now I read it in the manual "If xtest is given, defaults to FALSE." 
Thanks for your help!

Jim


Moshe Olshansky-2 wrote:
> 
> You must use randomForest with keep.forest=TRUE - otherwise the Forest
> object is not saved and so no prediction can be made.
> 
> 
> --- On Mon, 16/6/08, Jim_S <virtualreal at gmail.com> wrote:
> 
>> From: Jim_S <virtualreal at gmail.com>
>> Subject: [R]  randomForest, 'No forest component...' error while calling
>> Predict()
>> To: r-help at r-project.org
>> Received: Monday, 16 June, 2008, 8:13 AM
>> Dear R-users,
>> 
>> While making a prediction using the randomForest function
>> (package
>> randomForest) I'm getting the following error message: 
>> 
>> "Error in predict.randomForest(model, newdata = CV) : 
>> No forest component
>> in the object"
>> Here's my complete code. For reproducing this task,
>> please find my 2 data
>> sets attached (
>> http://www.nabble.com/file/p17855119/data.rar data.rar ).
>> 
>> Thanks in advance for any help!
>> 
>>  - Jim
>> 
>> CT <-
>> read.table("CT.txt",header=TRUE,sep="\t")
>> CV <-
>> read.table("CV.txt",header=TRUE,sep="\t")
>> # Both CT & CV have the syntaxis X1, X2,...,X97,Y where
>> all variables are
>> numeric 
>> x <- CT[,-98]
>> y <- CT[,98]
>> xtest <- CV[,-98]
>> ytest <- CV[,98]
>> library(randomForest)
>> model <- randomForest(x ,y , xtest,
>> ytest,ntree=500,mtry=32,nodesize=5,nPerm=2)
>> model
>> 
>> #Call:
>> # randomForest(x = x, y = y, xtest = xtest, ytest = ytest,
>> ntree = 500,     
>> mtry = 32, nodesize = 5, 
>> # nPerm = 2) 
>> #               Type of random forest: regression
>> #                    Number of trees: 500
>> #No. of variables tried at each split: 32
>> #
>> #          Mean of squared residuals: 0.0022117
>> #                    % Var explained: -1.01
>> #                       Test set MSE: 0
>> #                    % Var explained: 2.61
>>  
>> 
>> prediction <- predict(model, newdata= CT)
>> #Error in predict.randomForest(model, newdata = CV) : 
>> #  No forest component in the object
>> # 
>> -- 
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>> Sent from the R help mailing list archive at Nabble.com.
>> 
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained,
>> reproducible code.
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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