levels

问题 in R, how to set and retain custom levels in factor with different labels ? That is, I want to set custom numbers in the levels of a factor, and these numerical values - integers to be retained and not converted to "1, 2, 3 etc.". I know that one solution is to set these weights as Labels, but then I will missing the "labels" of the factor. The "weighted" distance between factors is not retained. Is it possible in R, to achieve something like this, using a single variable ? For example: age_f

来源： https://stackoverflow.com/questions/64420864/r-all-combinations-of-all-lengths-from-a-vector-of-elements-each-with-2-conditi

来源： https://stackoverflow.com/questions/23395366/mean-by-factor-by-level

来源： https://stackoverflow.com/questions/23395366/mean-by-factor-by-level

来源： https://stackoverflow.com/questions/23395366/mean-by-factor-by-level

来源： https://stackoverflow.com/questions/23395366/mean-by-factor-by-level

来源： https://stackoverflow.com/questions/23395366/mean-by-factor-by-level

来源： https://stackoverflow.com/questions/23395366/mean-by-factor-by-level

问题 Following up from this question I got a datframe after pivoting like this . AVG GrossProfit AVG PMV Loss% Sales ParentAuction Copart IAA Copart IAA Copart IAA Copart IAA Make Acura 112.99 NaN -15.53 NaN 36.46 NaN 96.0 NaN How to change the column levels to this format of columns ? ParentAuction Copart IAA AVG GrossProfit AVG PMV Loss% Sales AVG GrossProfit AVG PMV Loss% Sales Make Acura 112.99 -15.53 36.46 96.0 NaN NaN NaN NaN 回答1: Use swaplevel with sort_index for sorting MultiIndex : df =

问题 I'm designing a print for RS485 with the LTC2854 transceiver. I don't know what situation it will be placed in. So I don't know what voltage levels the other devices will communicate on. I will supply the transceiver with 3.3V and communicate on 0V and +3.3V. Does this mean I can still receive the full range of voltages -7V - +12V of other devices on the bus? Or does this mean that it can only be implemented on 0V - +3.3V level systems? In my understanding I should be able to detect