Convert numbers as expressions of exponential format

Modify input numbers to expression class of exponential format like expression(1.35~'×'~10^{4}).

expfn(
  x,
  digits = 3,
  scale = 1,
  prefix = "",
  suffix = "",
  decimal.mark = ".",
  trim = TRUE,
  ...
)

Arguments

x

numeric vector.

digits

a number of digits just before '×'. Default: 3

scale

a number to multiply x. Default: 1.

prefix

a character string to paste just before x. Default: ''.

suffix

a character string to paste just after x. Default: ''.

decimal.mark

a character string to use decimal mark, Default: '.'.

trim

Logical, if ‘FALSE’, values are right-justified to a common width (see ‘base::format()’). Default: TRUE.

...

extra arguments passed to scientific().

Value

An expression

Details

DETAILS

See also

str_extract scientific

Examples

expfn(c(1.2e8, 1.03e8, -Inf))
#> 1.20 1.03 NA 
#> expression(1.20~'×'~10^{8}, 1.03~'×'~10^{8}, NA~'×'~10^{NA})
expfn(-Inf)
#> NA 
#> expression(0)