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如何units从变量中将单位读入包中？我得到了错误...not recognised by udunits。MWE如下：

library(units)\nmeasurements <- runif(10)\nunitsofmeasurement <- "mm"\nset_units(measurements, unitsofmeasurement)\n

返回错误

Error: In \xe2\x80\x98unitsofmeasurement\xe2\x80\x99, \xe2\x80\x98unitsofmeasurement\xe2\x80\x99 is not recognized by udunits.\n

但以下有效：

set_units(measurements, "mm")\n