G. Grothendieck questions

G. Grothendieck answers

• Native pipe placeholder [duplicate]
• Data.Table: Aggregate by every two weeks
• Generate data.frame from frequency table
• Convert Daily Data into Weekly Data in R
• Having R ignore an argument in a function
• Include the grouping column in nested data
• Fitting nls model with a categorical variable
• Extract a single value from a dataframe/tibble the tidy/dplyr way?
• S3 method dispatch when argument is missing
• finding the previous Monday