signi: Rounding to Significant Digits

In mmaechler/sfsmisc: Utilities from 'Seminar fuer Statistik' ETH Zurich

Rounding to Significant Digits

Description

Rounds to significant digits similarly to signif.

Usage

signi(x, digits = 6)

Arguments

x	numeric vector to be rounded.
digits	number of significant digits required.

Value

numeric vector “close” to x, i.e. by at least digits significant digits.

Note

This is really just round(x, digits - trunc(log10(abs(x)))) and hence mainly of didactical use. Rather use signif() otherwise.

Author(s)

Martin Maechler, in prehistoric times (i.e. before 1990).

See Also

signif, round.

Examples

(x1 <- seq(-2, 4, by = 0.5))
identical(x1, signi(x1))# since 0.5 is exact in binary arithmetic
(x2 <- pi - 3 + c(-5,-1,0, .1, .2, 1, 10,100))
signi(x2, 3)

mmaechler/sfsmisc documentation built on Feb. 28, 2024, 4:18 a.m.