ud.convert {udunits2}

Convert numeric types from one unit to another

Description

This function takes the numeric argument x, quantified in units u1 and converts it to be of units u2.

Usage

ud.convert(x, u1, u2)

Arguments

x

Some argument which is convertible to a numeric type by as.double.

u1

A character string which is parseable into a udunits compatible unit.

u2

Another character string which is also parseable into a udunits compatible unit and for which there exists a defined transformation from the units represented by u1.

Details

This function uses the udunits function cv_convert_doubles to convert the argument from one set of units to another.

Value

Returns a numeric type having converted from one unit to another. The attributes of the original argument x (e.g. class, dimensions, etc.) are preserved and then re-applied to the return value of the transformation as such: attributes(rv) <- attributes(x) If either of unit u1 or u2 is unparseable, or there does not exist a conversion from one to the other the function raises an error.

Author(s)

James Hiebert [e-mail]

References

Unidata's udunits reference: https://www.unidata.ucar.edu/software/udunits/ API guide for cv_convert_doubles: https://www.unidata.ucar.edu/software/udunits/udunits-2.1.24/udunits2lib.html#index-cv_005fconvert_005fdoubles-39

See Also

ud.are.convertible

Examples

x <- seq(10)
ud.convert(x, "miles", "km")                   # c(1.609344, 3.218688, 4.828032, ...)
x <- c(-40, 0, 100)
ud.convert(x, "celsius", "degree_fahrenheit")  # c(-40, 32, 212)
err <- try(ud.convert(100,"miles", "grams"))   # Error
err <- try(ud.convert(NA, "not", "parseable")) # Error