search for: rforest

Hi, I'm trying to make a partial plot with package randomForest in R. After I perform my random forest object I type partialPlot(data.rforest, pred.data=act2, x.var=centroid, "C") where data.rforest is my randomforest object, act2 is the original dataset, centroid is one of the predictor and C is one of the classes in my response variable. Whatever predictor or response class I try I always get a plot with a straight line (a...

...tten the data exchange working except each row is read in as one 'chunk', meaning the row has all values between two quotes ("41 numbers"). I need to split these based upon the spaces between them. What is the simplest means of doing this? Code so far. datin<-file("C:\\rforest\\data\\aoidry_predictors_85.txt", open="rt") datout<-file("C:\\rforest\\prob85.txt",open="wt") x<-readLines(datin,n=1) writeLines(x,con=datout) Thanks, Seth -- View this message in context: http://r.789695.n4.nabble.com/readLines-with-space-delimiter-tp213...

...Site A and B to build the tree, while using the WHOLE Site C data for the oob error rate, - for tree 2, use only site A and C to build tree, while using whole site B data for oob - for tree 3, use Site B and C, A as oob...? My command does not work as it would use some sample in all of the sites: rforest.obj <- randomForest(Presence.f ~., data=dataset.subset, strata = site.factor) while the setting the corresponding "sampsize" argument seems would only screen out the Site in all tree building... Site Presence Length Sulphur A Yes 3.50 19.42 A No...

...executed to initialize the cluster workers. This is particularly useful for sending large matrices to each of the workers, since it allows the matrix to be broadcast using the mpi.bcast function without calling the R "serialize" function. An example of this technique is in the new "rforest.R" file, a parallel random forest benchmark which is included in the "benchmark" directory of the doMPI distribution. - Steve Weston _______________________________________________ R-packages mailing list R-packages at r-project.org https://stat.ethz.ch/mailman/listinfo/r-packages

.... > thanks for your answer. actually, taking a closer look at the representations of rpart or randomForest, I came to a much simpler and straight-forward solution: with only a couple of lines, the corresponding c-code for a tree can be emitted. e.g. for randomForest: ## generate C code from rforests. generate code for tree k gen_code=function(rfobj,k) { tree=getTree(rfobj,k,labelVar=TRUE); count=0; loc.env=environment(); visit=function(idx) { assign('count',count+1,env=loc.env); if (tree[idx,'status']==-1) cat(sprintf("RETURN(%s)\n",tre...

...executed to initialize the cluster workers. This is particularly useful for sending large matrices to each of the workers, since it allows the matrix to be broadcast using the mpi.bcast function without calling the R "serialize" function. An example of this technique is in the new "rforest.R" file, a parallel random forest benchmark which is included in the "benchmark" directory of the doMPI distribution. - Steve Weston _______________________________________________ R-packages mailing list R-packages at r-project.org https://stat.ethz.ch/mailman/listinfo/r-packages

...tten the data exchange working except each row is read in as one 'chunk', meaning the row has all values between two quotes ("41 numbers"). I need to split these based upon the spaces between them. What is the simplest means of doing this? Code so far. datin<-file("C:\\rforest\\data\\aoidry_predictors_85.txt", open="rt") datout<-file("C:\\rforest\\prob85.txt",open="wt") x<-readLines(datin,n=1) writeLines(x,con=datout) Thanks, Seth -- View this message in context: http://r.789695.n4.nabble.com/readLines-with-space-delimiter-tp213...