How to apply summarise_each to all columns except one? [duplicate]

问题:

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• Aggregate / summarize multiple variables per group (e.g. sum, mean) 4 answers

I am analyzing a set of data with many columns (almost 30 columns). I want to group data based on two columns and apply sum and mean functions to all the columns except timestamp. How would I use summarise_each on all columns except timestamp?

This is the draft code I have but it obviously not correct. Plus it generates and error because it can not apply Sum to POSIXt data type (Error: 'sum' not defined for "POSIXt" objects)

features <- dataset %>%    group_by(X, Y) %>%    summarise_each(funs(mean,sum)) %>%   arrange(TIMESTAMP)

回答1:

Try summarise_each(funs(mean,sum), -TIMESTAMP) to exclude TIMESTAMP from the summarisation.

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