Nothing
srfht <-
function(A,k,q=0){
m<-NROW(A)
mbig<-2^ceiling(log2(m))
R<-sample(c(-1,1),m,replace=TRUE)
Astar<-A*R
idx<-sample(mbig,k)
AOmega<-fht(Astar)[idx,]/sqrt(k)
Q<-qr.Q(qr(t(AOmega)))
for(i in seq_len(q)){
tildeQ<-qr.Q(qr(crossprod(A,Q)))
Q<-qr.Q(qr(A%*%tildeQ))
}
Q
}
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