| TsparseMatrix-class {Matrix} | R Documentation |
The "TsparseMatrix" class is the virtual class of
all sparse matrices coded in triplet form. Since it is a virtual class,
no objects may be created from it. See
showClass("TsparseMatrix") for its subclasses.
Dim, Dimnames:from the "Matrix" class,
i:Object of class "integer" - the row indices
of non-zero entries in 0-base, i.e., must be in
0:(nrow(.)-1).
j:Object of class "integer" - the column
indices of non-zero entries. Must be the same length as slot
i and 0-based as well, i.e., in
0:(ncol(.)-1). For numeric Tsparse matrices, (i,j)
pairs can occur more than once, see dgTMatrix.
Class "sparseMatrix", directly.
Class "Matrix", by class "sparseMatrix".
Extraction ("[") methods, see
[-methods.
Most operations with sparse matrices are performed using the
compressed, column-oriented or CsparseMatrix
representation. The triplet representation is convenient for
creating a sparse matrix or for reading and writing such
matrices. Once it is created, however, the matrix is generally
coerced to a CsparseMatrix for further
operations.
For convenience, methods for some operations such as %*%
and crossprod are defined for
TsparseMatrix objects. These methods simply
coerce the TsparseMatrix object to a
CsparseMatrix object then perform the
operation.
its superclass, sparseMatrix, and the
dgTMatrix class, for the links to other classes.
showClass("TsparseMatrix")
## or just the subclasses' names
names(getClass("TsparseMatrix")@subclasses)