delayed-ops: Delayed Operations on "matter" Objects

In matter: A framework for rapid prototyping with file-based data structures

Description

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

Details

Currently the following delayed operations are supported:

‘Arith’: ‘+’, ‘-’, ‘*’, ‘/’, ‘^’, '

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

‘Logic’: ‘&’, ‘|’

‘Ops’: ‘Arith’, ‘Compare’, ‘Logic’

‘Math’: ‘exp’, ‘log’, ‘log2’, ‘log10’

Delayed operations are applied at the C++ layer immediately after the elements are read from virtual memory. 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 in storage is not modified; only object metadata is changed.

Author(s)

Kylie A. Bemis

See Also

Arith, Compare, Logic, Ops, Math

Examples

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

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

mean(x)
mean(y)

matter documentation built on Nov. 8, 2020, 6:15 p.m.