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### Coercion and Methods for Triangular Triplet Matrices
setAs("dtTMatrix", "dgTMatrix",
function(from) tT2gT(from, cl = "dtTMatrix", toClass = "dgTMatrix"))
setAs("dtTMatrix", "generalMatrix",
function(from) tT2gT(from, cl = "dtTMatrix", toClass = "dgTMatrix"))
if(FALSE) ## needed in ../tests/Class+Meth.R -- replaced by .T.2.l() in ./Tsparse.R
setAs("dtTMatrix", "ltTMatrix",
function(from) new("ltTMatrix", i = from@i, j = from@j,
x = as.logical(from@x),
uplo = from@uplo, diag = from@diag,
Dim = from@Dim, Dimnames = from@Dimnames))
if(FALSE) ## needed in ../tests/Class+Meth.R -- replaced by .T.2.n() in ./Tsparse.R
setAs("dtTMatrix", "ntTMatrix",
function(from) new("ntTMatrix", i = from@i, j = from@j,
uplo = from@uplo, diag = from@diag,
Dim = from@Dim, Dimnames = from@Dimnames))
## Conversion to dense storage is first to a dtrMatrix
setAs("dtTMatrix", "dtrMatrix",
function(from) .Call(dtTMatrix_as_dtrMatrix, from))
setAs("dtTMatrix", "matrix",
function(from) as(as(from, "dtrMatrix"), "matrix"))
setAs("dtTMatrix", "dgeMatrix",
function(from) as(as(from, "dtrMatrix"), "dgeMatrix"))
setAs("matrix", "dtTMatrix",
function(from) as(as(from, "dtpMatrix"), "dtTMatrix"))
setMethod("t", "dtTMatrix",
function(x)
new("dtTMatrix", Dim = x@Dim[2:1], Dimnames = x@Dimnames[2:1],
i = x@j, j = x@i, x = x@x, diag = x@diag,
uplo = if (x@uplo == "U") "L" else "U"))
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