Nothing
rvsel_Fsel <- function(x,y,method,lambda){
p = ncol(x)
x = cbind(x,1-x)
out3 = rep(0,2*p)
pre.max = NULL
for(step.i in 1:p){
if(step.i!=1){pre.max <- post.max}
if(step.i==1){CB=diag(1,2*p)
} else {CB=diag(step.i,2*p);CB[,choosed]=rep(out3[choosed],each=2*p);CB=CB[-c(choosed,pair),]}
if(is.vector(CB)){CB=t(as.matrix(CB))}
step.score=rep(NA,nrow(CB))
for(k in 1:nrow(CB)){
stepCM = as.matrix(x[,which(CB[k,]!=0)])
if(method=="cmc") {step.score[k]=rvsel_cmc(stepCM,y)
} else {step.score[k]=rvsel_sum(stepCM,y)}
}
post.max = max(step.score)
if(step.i!=1){if(post.max - pre.max < lambda ) break}
out3 = CB[which.max(step.score),]
choosed = which(out3!=0)
pair = ifelse(choosed > p, choosed - p, choosed + p)
out2 = post.max
}
out3 = out3[1:p] - out3[-(1:p)]
out1 = as.numeric(out3!=0)
out3 = which(out3!=0)[order(abs(out3[which(out3!=0)]))]
return(list(selection=out1,score=out2,sequence=out3))
}
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