#### Positive-definite Symmetric Packed Matrices -- Coercion and Methods

setAs("dppMatrix", "dpoMatrix",
      function(from) as(as(from, "dsyMatrix"), "dpoMatrix"))

to_dpp <- function(from) as(as(from, "dpoMatrix"), "dppMatrix")
setAs("Matrix", "dppMatrix", to_dpp)# some may fail, but this tries
setAs("matrix", "dppMatrix", to_dpp)

setMethod("chol", signature(x = "dppMatrix"),
	  function(x, pivot, LINPACK) .Call(dppMatrix_chol, x))

setMethod("rcond", signature(x = "dppMatrix", norm = "character"),
          function(x, norm, ...)
          .Call(dppMatrix_rcond, x, norm),
          valueClass = "numeric")

setMethod("rcond", signature(x = "dppMatrix", norm = "missing"),
          function(x, norm, ...)
          .Call(dppMatrix_rcond, x, "O"),
          valueClass = "numeric")

setMethod("solve", signature(a = "dppMatrix", b = "missing"),
          function(a, b, ...)
          .Call(dppMatrix_solve, a),
          valueClass = "dppMatrix")

setMethod("solve", signature(a = "dppMatrix", b = "dgeMatrix"),
          function(a, b, ...)
          .Call(dppMatrix_matrix_solve, a, b),
          valueClass = "dgeMatrix")

setMethod("solve", signature(a = "dppMatrix", b = "matrix"),
          function(a, b, ...)
          .Call(dppMatrix_matrix_solve, a, b),
          valueClass = "dgeMatrix")

##setMethod("solve", signature(a = "dppMatrix", b = "numeric"),
##          function(a, b, ...)
##          .Call(dppMatrix_matrix_solve, a, as.matrix(b)),
##          valueClass = "dgeMatrix")

setMethod("solve", signature(a = "dppMatrix", b = "integer"),
          function(a, b, ...) {
              storage.mode(b) <- "double"
              .Call(dppMatrix_matrix_solve, a, as.matrix(b))
          }, valueClass = "dgeMatrix")

setMethod("t", signature(x = "dppMatrix"),
          function(x) as(t(as(x, "dspMatrix")), "dppMatrix"),
          valueClass = "dppMatrix")