R 用相应的单位打印单位编号

Question

我有一个使用带有单位的数字参数的脚本。当向日志/用户打印消息时，我希望打印添加相应的单位。 我期望 R 能够足够聪明地这样做：

library(units)

min_size = set_units(1200, "m^2")
print(paste0("Must be at least ", min_size))

# Prints: "Must be at least 1200"
# I want: "Must be at least 1200 m^2")

# ideally without explicitly adding " m^2", to avoid code inconsistency when changing units
print(paste0("Must be at least ", min_size, " m^2"))

Answer 1

简单的答案是使用

units(min_size)

获取单位的可打印表示。

print(paste0("Must be at least ", min_size, " ", units(min_size)))