number_format {validate}

Check the layouts of numbers.

Description

Convenience function to check layout of numbers stored as a character vector.

Usage

number_format(x, format = NULL, min_dig = NULL, max_dig = NULL, dec = ".")

Arguments

x

[character] vector. If x is not of type character it will be converted.

format

[character] denoting the number format (see below).

min_dig

[numeric] minimal number of digits after decimal separator.

max_dig

[numeric] maximum number of digits after decimal separator.

dec

[character] decimal seperator.

Details

If format is specified, then min_dig, max_dig and dec are ignored.

Numerical formats can be specified as a sequence of characters. There are a few special characters:

• d Stands for digit.

• * (digit globbing) zero or more digits

Here are some examples.

"d.dd"	One digit, a decimal point followed by two digits.
"d.ddddddddEdd"	Scientific notation with eight digits behind the decimal point.
"0.ddddddddEdd"	Same, but starting with a zero.
"d,dd*"	one digit before the comma and at least two behind it.

See Also

Other format-checkers: field_format(), field_length()

Examples

df <- data.frame(number = c("12.34","0.23E55","0.98765E12"))
rules <- validator(
   number_format(number, format="dd.dd")
   , number_format(number, "0.ddEdd")
   , number_format(number, "0.*Edd")
)

out <- confront(df, rules)
values(out)

# a few examples, without 'validator'
number_format("12.345", min_dig=2) # TRUE
number_format("12.345", min_dig=4) # FALSE
number_format("12.345", max_dig=2) # FALSE
number_format("12.345", max_dig=5) # TRUE
number_format("12,345", min_dig=2, max_dig=3, dec=",") # TRUE