format.info {base}R Documentation

format(.) Information

Description

Information is returned on how format(x, digits = options("digits")) would be formatted.

Usage

format.info(x, nsmall = 0)

Arguments

x (numeric) vector; potential argument of format(x,...).
nsmall (see format(*, nsmall)).

Value

An integer vector of length 3, say r.

r[1] width (number of characters) used for format(x)
r[2] number of digits after decimal point.
r[3] in 0:2; if >=1, exponential representation would be used, with exponent length of r[3]+1.

Note

The result depends on the value of options("digits").

See Also

format, formatC.

Examples

dd <- options("digits") ; options(digits = 7) #-- for the following
format.info(123) # 3 0 0
format.info(pi)  # 8 6 0
format.info(1e8) # 5 0 1 - exponential "1e+08"
format.info(1e222)#6 0 2 - exponential "1e+222"

x <- pi*10^c(-10,-2,0:2,8,20)
names(x) <- formatC(x,w=1,dig=3,format="g")
cbind(sapply(x,format))
t(sapply(x, format.info))

## using at least 8 digits right of "."
t(sapply(x, format.info, nsmall = 8))

# Reset old options:
options(dd)

[Package base version 2.1.0 Index]