Hi, 
 
Is there anyone have some experience in the boost package. I used the logitboost function to do the two-class classification. 
 
This is the format I used.  
logitboost(xtrain, ytrain, xtest, presel = 2, mfinal = 100) # with feature selection
 
 
logitboost(xtrain, ytrain, xtest, presel = 0, mfinal = 100) # without feature selection
 
xtrain is n*p, n is sample size, p is dimension
 
The error is always like this 
 
Error in model.frame.default(formula = y ~ bx, weights = w/mean(w), na.action = function (x)  :   invalid type (list) for variable 'bx'
 
 
I tried to implement by copying the original code of this function to track down but still I don't know what's the reason. 
Could somebody help me with that? 
I greatly appreciate your help!
 
sincerely,
Linda 
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