dsRMatrix-class | R Documentation |

The `dsRMatrix`

class is a class of symmetric, sparse
matrices in the compressed, row-oriented format. In this
implementation the non-zero elements in the rows are sorted into
increasing column order.

These `"..RMatrix"`

classes are currently still mostly unimplemented!

Objects can be created by calls of the form `new("dsRMatrix", ...)`

.

`uplo`

:A character object indicating if the upper triangle (

`"U"`

) or the lower triangle (`"L"`

) is stored. At present only the lower triangle form is allowed.`j`

:Object of class

`"integer"`

of length`nnzero`

(number of non-zero elements). These are the row numbers for each non-zero element in the matrix.`p`

:Object of class

`"integer"`

of pointers, one for each row, to the initial (zero-based) index of elements in the row.`factors`

:Object of class

`"list"`

- a list of factorizations of the matrix.`x`

:Object of class

`"numeric"`

- the non-zero elements of the matrix.`Dim`

:Object of class

`"integer"`

- the dimensions of the matrix - must be an integer vector with exactly two non-negative values.`Dimnames`

:List of length two, see

`Matrix`

.

Classes `RsparseMatrix`

, `dsparseMatrix`

and
`symmetricMatrix`

, directly.

Class `"dMatrix"`

, by class `"dsparseMatrix"`

,
class `"sparseMatrix"`

, by class `"dsparseMatrix"`

or
`"RsparseMatrix"`

;
class `"compMatrix"`

by class `"symmetricMatrix"`

and of course,
class `"Matrix"`

.

- forceSymmetric
`signature(x = "dsRMatrix", uplo = "missing")`

: a trivial method just returning`x`

- forceSymmetric
`signature(x = "dsRMatrix", uplo = "character")`

: if`uplo == x@uplo`

, this trivially returns`x`

; otherwise`t(x)`

.

the classes `dgCMatrix`

,
`dgTMatrix`

, and `dgeMatrix`

.

```
(m0 <- new("dsRMatrix"))
m2 <- new("dsRMatrix", Dim = c(2L,2L),
x = c(3,1), j = c(1L,1L), p = 0:2)
m2
stopifnot(colSums(as(m2, "TsparseMatrix")) == 3:4)
str(m2)
(ds2 <- forceSymmetric(diag(2))) # dsy*
dR <- as(ds2, "RsparseMatrix")
dR # dsRMatrix
```

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