Nothing
isqrtfa <-
function(Psi,B){
m = length(Psi)
nbf = ncol(B)
sing = B/(sqrt(Psi)%*%t(rep(1,nbf)))
sing = fast.svd(sing)
tmp = rep(1,nbf) - 1/sqrt(rep(1,nbf) + sing$d^2)
tmp = sing$u*(rep(1,m)%*%t(tmp))
tmp = diag(m)-tmp%*%t(sing$u)
tmp = tmp/(sqrt(Psi)%*%t(rep(1,m)))
return(tmp)
}
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