Nothing
mat.sqrt.inv <-
function(A)
{
ei<-eigen(A)
d<-ei$values
d<-(d+abs(d))/2
d2<-1 / sqrt(d)
d2[d == 0]<-0
ans<-ei$vectors %*% diag(d2) %*% t(ei$vectors)
return(ans)
}
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