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multiplyr (version 0.1.1)

sm_desc_update: Update description of a big.matrix after a row subset (internal)

Description

Generating a new big.matrix.descriptor or doing sub.big.matrix on something that's not a descriptor is slow. This method exists to effectively create the descriptor that describe(new.sub.big.matrix) would do, but in a fraction of the time.

Usage

sm_desc_update(desc, first, last)

Arguments

desc
Existing big.matrix.descriptor
first
First relative row of that matrix
last
Last relative row of that matrix

Value

New descriptor