ColumnReader-class | R Documentation |
A class that supports reading of data from a matrix-like storage format, such as a file or a database, in a column-wise manner.
nrow
An integer
representing the number of rows in the matrix-like storage.
ncol
An integer
representing the number of columns in the matrix-like storage.
reader
A function
that takes a set of column indices as input and returns a matrix
containing the requested columns from the storage.
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