R language dplyr package filter function filters dataframe data. If the name of the data column (variable) to be filtered contains quotation marks, you need to use!! SYM syntax processing, otherwise n

R Language dplyr package filter Function filtering dataframe data 、 If you need to filter the data column （ Variable ） If the name contains quotation marks, you need to use !!sym Grammar processing 、 Otherwise, because the quotation marks cannot be processed, no data can be filtered

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