Nothing
tracefht <-
function(A,k,trace.full=NULL){
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,]
AAOmega<-tcrossprod(AOmega,A)
if (!is.null(trace.full))
tr<-sum(rowSums(AOmega*AOmega))/k
trsquared<-sum(rowSums(AAOmega*AAOmega))/k
if (is.null(trace.full))
trsquared
else
trsquared*(trace.full/tr)^2
}
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