# R/SparseM-conv.R In Matrix: Sparse and Dense Matrix Classes and Methods

```## METHODS ENHANCING PACKAGE: sparseM
## ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

## ~~~~ COERCIONS FROM SparseM TO Matrix ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

## Natural pairs
setAs("matrix.csc", "dgCMatrix",
function(from) new("dgCMatrix", Dim = from@dimension,
p = from@ia - 1L, i = from@ja - 1L, x = from@ra))
setAs("matrix.csr", "dgRMatrix",
function(from) new("dgRMatrix", Dim = from@dimension,
p = from@ia - 1L, j = from@ja - 1L, x = from@ra))
setAs("matrix.coo", "dgTMatrix",
function(from) new("dgTMatrix", Dim = from@dimension,
i = from@ia - 1L, j = from@ja - 1L, x = from@ra))

## Remaining matrix.c(sc|sr|oo) to dgCMatrix
setAs("matrix.csr", "dgCMatrix",
function(from) .CR2RC(as(from, "dgRMatrix")))
setAs("matrix.coo", "dgCMatrix",
function(from) .T2C(as(from, "dgTMatrix")))

## Each matrix.c(sc|sr|oo) to each [CRT]sparseMatrix
setAs("matrix.csc", "CsparseMatrix",
function(from)        as(from, "dgCMatrix"))
setAs("matrix.csc", "RsparseMatrix",
function(from) .CR2RC(as(from, "dgCMatrix")))
setAs("matrix.csc", "TsparseMatrix",
function(from)  .CR2T(as(from, "dgCMatrix")))
setAs("matrix.csr", "CsparseMatrix",
function(from) .CR2RC(as(from, "dgRMatrix")))
setAs("matrix.csr", "RsparseMatrix",
function(from)        as(from, "dgRMatrix"))
setAs("matrix.csr", "TsparseMatrix",
function(from)  .CR2T(as(from, "dgRMatrix")))
setAs("matrix.coo", "CsparseMatrix",
function(from)   .T2C(as(from, "dgTMatrix")))
setAs("matrix.coo", "RsparseMatrix",
function(from)   .T2R(as(from, "dgTMatrix")))
setAs("matrix.coo", "TsparseMatrix",
function(from)        as(from, "dgTMatrix"))

## Each matrix.c(sc|sr|oo) to sparseMatrix, Matrix ("easy")
## NB: favouring column format over row format
setAs("matrix.csc", "sparseMatrix", function(from) as(from, "CsparseMatrix"))
setAs("matrix.csr", "sparseMatrix", function(from) as(from, "CsparseMatrix"))
setAs("matrix.coo", "sparseMatrix", function(from) as(from, "TsparseMatrix"))
setAs("matrix.csc",       "Matrix", function(from) as(from, "CsparseMatrix"))
setAs("matrix.csr",       "Matrix", function(from) as(from, "CsparseMatrix"))
setAs("matrix.coo",       "Matrix", function(from) as(from, "TsparseMatrix"))

## ~~~~ COERCIONS FROM Matrix TO SparseM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

## Natural pairs
setAs("dgCMatrix", "matrix.csc",
function(from) new("matrix.csc", dimension = from@Dim,
ia = from@p + 1L, ja = from@i + 1L, ra = from@x))
setAs("dgRMatrix", "matrix.csr",
function(from) new("matrix.csr", dimension = from@Dim,
ia = from@p + 1L, ja = from@j + 1L, ra = from@x))
setAs("dgTMatrix", "matrix.coo",
function(from) new("matrix.coo", dimension = from@Dim,
ia = from@i + 1L, ja = from@j + 1L, ra = from@x))

## Everything else
setAs("Matrix", "matrix.csc",
function(from) as(as(as(as(from, "dMatrix"), "generalMatrix"), "CsparseMatrix"), "matrix.csc"))
setAs("Matrix", "matrix.csr",
function(from) as(as(as(as(from, "dMatrix"), "generalMatrix"), "RsparseMatrix"), "matrix.csr"))
setAs("Matrix", "matrix.coo",
function(from) as(as(as(as(from, "dMatrix"), "generalMatrix"), "TsparseMatrix"), "matrix.coo"))
```

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Matrix documentation built on Nov. 11, 2022, 9:06 a.m.