Read and write CLUTO sparse matrix format files, or the CCS format variant employed by the MC toolkit.
read_stm_CLUTO(file)
write_stm_CLUTO(x, file)
read_stm_MC(file, scalingtype = NULL)
write_stm_MC(x, file)
a character string with the name of the file to read or write.
a matrix object.
a character string specifying the type of scaling
to be used, or NULL (default), in which case the scaling will
be inferred from the names of the files with non-zero entries found
(see Details).
Documentation for CLUTO including its sparse matrix format used to be available from https://www-users.cse.umn.edu/~karypis/cluto/.
read_stm_CLUTO reads CLUTO sparse matrices, returning a
simple triplet matrix.
write_stm_CLUTO writes CLUTO sparse matrices.
Argument x must be coercible to a simple triplet matrix via
as.simple_triplet_matrix.
MC is a toolkit for creating vector models from text documents (see
https://www.cs.utexas.edu/~dml/software/mc/). It employs a
variant of Compressed Column Storage (CCS) sparse matrix format,
writing data into several files with suitable names: e.g., a file with
_dim appended to the base file name stores the matrix
dimensions. The non-zero entries are stored in a file the name of
which indicates the scaling type used: e.g., _tfx_nz indicates
scaling by term frequency (t), inverse document frequency
(f) and no normalization (x). See README in the
MC sources for more information.
read_stm_MC reads such sparse matrix information with argument
file giving the path with the base file name, and returns a
simple triplet matrix.
write_stm_MC writes matrices in MC CCS sparse matrix format.
Argument x must be coercible to a simple triplet matrix via
as.simple_triplet_matrix.