Nothing
matfreeQ <-
function(Mmult,tMmult,m,cols,q=0){
Omega<-matrix(rnorm(m*cols), ncol=m)
AOmega<-Mmult(Omega)
Q<-qr.Q(qr(AOmega))
for(i in seq_len(q)){
tildeQ<-qr.Q(qr(tMmult(Q)))
Q<-qr.Q(qr(Mmult(tildeQ)))
}
Q
}
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