delayed-ops {matter}R Documentation

Delayed Operations on “matter” Objects

Description

Some arithmetic operations are available as delayed operations on matter objects. With these operations, no data is changed on disk, and the operation is only executed when elements of the object are actually accessed.

Details

Currently the following operations are supported:

‘Arith’: ‘+’, ‘-’, ‘*’, ‘/’, ‘^’

‘Compare’: ‘==’, ‘>’, ‘<’, ‘!=’, ‘<=’, ‘>=’

‘Math’: ‘exp’, ‘log’, ‘log2’, ‘log10’

Delayed operations are applied at the C++ layer immediately after the elements are read from disk. This means that operations that are implemented in C and/or C++ for efficiency (such as summary statistics) will also reflect the execution of the delayed operations.

Value

A new matter object with the registered delayed operation. Data on disk is not modified; only object metadata is changed.

Author(s)

Kylie A. Bemis

See Also

Arith, Compare, Math

Examples

x <- matter(1:100)
y <- 2 * x + 1

x[1:10]
y[1:10]

mean(x)
mean(y)

[Package matter version 1.6.0 Index]