# NOT RUN {
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
# }
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