Rounding to Significant Digits
Rounds to significant digits similarly to signif.
signi(x, digits = 6)
x |
numeric vector to be rounded. |
digits |
number of significant digits required. |
numeric vector “close” to x, i.e. by at least digits
significant digits.
This is really just round(x, digits - trunc(log10(abs(x)))) and
hence mainly of didactical use. Rather use signif() otherwise.
Martin Maechler, in prehistoric times (i.e. before 1990).
(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)
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