Nothing
mexschurfun = function(X,dd,options){
n <- length(dd)
isspX <- is(X,"sparseMatrix")
irX <- 0
jcX <- 0
if(isspX){
Y <- as(X,"dgTMatrix")
irX <- Y@i
jcX <- Y@j
x <- Y@x
m <- length(X)
}else{
m <- dim(X)[1]*dim(X)[2]
}
Z <- .C("mexschurfun_c",X=as.double(X),as.integer(irX),
as.integer(jcX),as.double(dd),as.integer(n),
as.integer(isspX),as.integer(options))
return(Z$X)
}
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