[R] randomForest, 'No forest component...' error while calling Predict() from Jim_S on 2008-06-16 (R help archive)

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

From: Jim_S <virtualreal_at_gmail.com>
Date: Sun, 15 Jun 2008 15:13:45 -0700 (PDT)

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!

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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