Class SFBM
A reference class for storing and accessing sparse matrix-like data stored in files on disk.
Convert a dgCMatrix or dsCMatrix to an SFBM.
as_SFBM(spmat, backingfile = tempfile())
spmat |
A dgCMatrix (non-symmetric sparse matrix of type 'double') or dsCMatrix (symmetric sparse matrix of type 'double'). |
backingfile |
Path to file where to store data. Extension |
An object of class SFBM has many fields:
$address: address of the external pointer containing the underlying
C++ object to be used as a XPtr<SFBM> in C++ code
$extptr: (internal) use $address instead
$nrow: number of rows
$ncol: number of columns
$nval: number of non-zero values
$p: vector of column positions
$backingfile or $sbk: File with extension 'sbk' that stores the
data of the SFBM
$rds: 'rds' file (that may not exist) corresponding to the 'sbk' file
$is_saved: whether this object is stored in $rds?
And some methods:
$save(): Save the SFBM object in $rds. Returns the SFBM.
$add_columns(): Add new columns from another sparse dgCMatrix.
The new SFBM.
spmat <- Matrix::rsparsematrix(1000, 1000, 0.01) class(spmat) (X <- as_SFBM(spmat))
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