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26 results for “from:Martin Lam”

Re-evaluating the tree in the random forest
Martin Lam · Sep 10, 2005 · r-help

Hi Andy, Thank you for your help but it was not really a solution to my problem. Following from your iris example, if I do "iris.rf$forest$xbestsplit[1,1] <- 1.1" instead of "iris.rf$forest$xbestsplit[1...

R: characters
Martin Lam · Aug 17, 2005 · r-help

Hmm, it seems that the only difference is the use of "as.data.frame(a)" instead of "a". Hence, the same result can be done with: a <- rbind(c(T, T, F), c(F, F, T)) a[a==F]="" as...

data manipulation
Martin Lam · Sep 8, 2005 · r-help

Hi, This may not be the best solution, but at least it's easy to see what i'm doing, assume that your data set is called "data": # remove the 4th column data1 = data[,-4] # remove the 3rd column data2...

problem with certain data sets when using randomForest
Martin Lam · Aug 26, 2005 · r-help

Hi, Since I've had no replies on my previous post about my problem I am posting it again in the hope someone notice it. The problem is that the randomForest function doesn't take datasets which has instances only...

Data management problem: convert text string to matrix of 0's and 1's
Martin Lam · Jan 27, 2006 · r-help

Hi Dale, Unfortunately, you didn't say in what for format your data is saved into, so I presume it's saved as a list of strings. Perhaps there is a faster/better way, but this should suffice if your...

Re-evaluating the tree in the random forest
Martin Lam · Sep 9, 2005 · r-help

Hi, Let me give a simple example, assume a dataset containing 5 instances with 1 variable and the class label: [x1, y]: [0.5, A] [3.2, B] [4.5, B] [1.4, C] [1.6, C] [1.9, C...

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