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## to get the dim of the matrix of an object def as corrMatrix <- structure(list(matrix=matrix_),class=c("list","precision"))
dim.precision <- function(x) return(dim(x[["matrix"]]))
`[.precision` <- function(x,i,j,
drop = TRUE ## by default, this function will return scalar/vector
) {
x[["matrix"]] <- x[["matrix"]][i,j,drop=drop]
return(x)
}
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