I'm not entirely sure what you want, and your last line of code does not help either, but anyway: "Chained" filtering is done by "chaining" the criteria in ... ... <看更多>
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I'm not entirely sure what you want, and your last line of code does not help either, but anyway: "Chained" filtering is done by "chaining" the criteria in ... ... <看更多>
The concept to understand is that the conditional is actually a vector. So, you can simply define the conditions, and then combine them logically, like: ... <看更多>
filter : subset a dataframe according to condition(s) in a variable(s); select : choose a specific variable or set of variables; arrange : order dataframe ... ... <看更多>