format.info {base} | R Documentation

## format(.) Information

### Description

Information is returned on how `format(x, digits, nsmall)` would be formatted.

### Usage

    format.info(x, digits = NULL, nsmall = 0)

### Arguments

`x` | an atomic vector; a potential argument of `format(x, ...)`.
`digits` | how many significant digits are to be used for numeric and complex `x`. The default, `NULL`, uses `getOption(digits)`.
`nsmall` | (see `format(..., nsmall)`).

### Value

An `integer` `vector` of length 1, 3 or 6, say `r`.

For logical, integer and character vectors a single element, the width which would be used by `format` if `width = NULL`.

For numeric vectors:

`r[1]` | width (in characters) used by `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`.

For a complex vector the first three elements refer to the real parts, and there are three further elements corresponding to the imaginary parts.

### See Also

`format` (notably about `digits >= 16`), `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, width=1, digits=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 2.15.1 Index]