Parse Units and Errors

Functions to parse character vectors into quantities.

Usage

parse_quantities(x, decimal_mark)

parse_units(x, decimal_mark)

parse_errors(x, decimal_mark)

Arguments

x

a character vector to parse.

decimal_mark

the dot (.) if not provided.

Value

A quantities, units or errors object respectively.

Details

Each parse_*() function returns an object of the corresponding type, no matter what it is found. This means that, for parse_units, if errors are found, they are dropped with a warning. Similarly for parse_errors, if units are found, they are dropped with a warning. On the other hand, parse_quantities always returns a valid quantities object, even if no errors or units are found (then, zero error and dimensionless units are applied).

Examples

parse_quantities("(1.6021766208 +/- .0000000098) e-19 C")
#> 1.60217662(1)e-19 [C]
parse_quantities("1.6021766208(98) e-19 C")
#> 1.60217662(1)e-19 [C]
parse_units("1.6021766208 e-19 C")
#> 1.602177e-19 [C]
parse_errors("1.6021766208(98) e-19")
#> 1.60217662(1)e-19

# quantities are converted to the first unit
parse_quantities(c("12.34(2) m/s", "36.5(1) km/h"))
#> Units: [m/s]
#> Errors: 0.02000000 0.02777778
#> [1] 12.34000 10.13889

# or kept as a list of mixed units
parse_quantities(c("1.02(5) g", "2.51(0.01) V", "(3.23 +/- 0.12) m"))
#> Mixed units: V (1), g (1), m (1) 
#> 1.02(5) [g], 2.51(1) [V], 3.2(1) [m]