[Solved] How to summarise a dataframe in R with different function for different column?

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I suggest you to use the dplyr package. You can try the following code: if df is your dataframe:

library(dplyr)
summarised_df <- group_by(df, Ticker) %>%
                 summarise(
                           max(tradeDate), 
                           sum(SharesBought), 
                           max(HighestPxPaid), 
                           min(LowestPxPaid)
                 )

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solved How to summarise a dataframe in R with different function for different column?