# sgCMatrix-class

##### Class "sgCMatrix" -- Sparse Ordered Lists of Symbols

Sparse pseudo matrices in column-compressed form for storing ordered
*lists* of symbols.

- Keywords
- classes

##### Note

The number of rows can be larger than the number of symbols actually
occurring. Thus `i`

need not be recoded upon subsetting or two
collections of lists with the same index base can be easily combined
(column or *row*-wise).

Many of the *methods* of this class implemented in C are
currently not interfaced as R methods.

##### Objects from the Class

Most frequently, an object is created upon creation of an object of
class ```
or
```

`.`

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

.

##### Slots

`p`

:- an integer vector of length the number of columns
in the matrix plus one. These are
*zero-based pointers*into`i`

, i.e. to the first element of a list. However, note that the last element contains the number of elements of`i`

. `i`

:- an integer vector of length the number of non-zero
elements in the matrix. These are
*zero-based*symbol indexes, i.e. pointers into the row names if such exist. `Dim`

:- an integer vector representing the number of symbols and the number of lists.
`Dimnames`

:- a list with components for symbol and
*list*labels. `factors`

:- unused, for compatibility with package Matrix only.

##### Methods

`coerce`

`signature(from = "sgCMatrix", to = "list")`

`coerce`

`signature(from = "list", to = "sgCMatrix")`

`coerce`

`signature(from = "ngCMatrix", to = "sgCMatrix")`

`dim`

`signature(x = "sgCMatrix")`

`dimnames`

`signature(x = "sgCMatrix")`

`dimnames<-`

`signature(x = "sgCMatrix", value = "ANY")`

`show`

`signature(x = "sgCMatrix")`

##### See Also

##### Examples

```
## 3 example sequences
x <- list("01" = list(c("A","B"), "C"),
"02" = list("C"),
"03" = list("B", "B"))
## uses paste
s <- as(x, "sgCMatrix")
s
##
dim(s)
dimnames(s)
```

*Documentation reproduced from package arulesSequences, version 0.2-19, License: GPL-2*

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