zap: Zap small values in a spray object

In spray: Sparse Arrays and Multivariate Polynomials

Zap small values in a spray object

Description

Generic version of zapsmall()

Usage

zap(x, digits = getOption("digits"))
## S4 method for signature 'spray'
zapsmall(x, digits = getOption("digits"))

Arguments

x	spray object
digits	number of digits to retain

Details

Given a spray object, coefficients close to zero are ‘zapped’, i.e., replaced by ‘0’, using base::zapsmall(). Function zap() is an easily-typed alias; zapsmall() is the S4 generic.

Note, zap() actually changes the numeric value, it is not just a print method.

Author(s)

Robin K. S. Hankin

Examples

(S <- spray(matrix(sample(1:50),ncol=2),10^-(1:25)))
zap(S)

S-zap(S)        # print method will probably print zeros...
coeffs(S-zap(S)) # ...but they are nevertheless nonzero

spray documentation built on Aug. 10, 2023, 5:11 p.m.