headsortails: Head and Tail of a Distributed Matrix

In wrathematics/pbdDMAT: 'pbdR' Distributed Matrix Methods

Head and Tail of a Distributed Matrix

Description

The functions rely on reblocking across different BLACS contexts. If i is not empty, then the input distributed matrix will be redistributed along context 1, where extracting/deleting rows does not destroy block-cyclicality. Likewise, if j is not empty, then the input distributed matrix will be redistributed along context 2. When extraction is complete, the matrix will be redistributed across its input context.

Usage

## S3 method for class 'ddmatrix'
head(x, n = 6L, ...)

## S3 method for class 'ddmatrix'
tail(x, n = 6L, ...)

Arguments

x	numeric distributed matrix.
n	a single integer. If positive, size for the resulting object: number of elements for a vector (including lists), rows for a matrix or data frame or lines for a function. If negative, all but the n last/first number of elements of x.
...	additional arguments.

Value

Returns a distributed matrix.

wrathematics/pbdDMAT documentation built on Oct. 2, 2024, 2:56 p.m.