akrun questions

akrun answers

• Extract grouped values from a dataframe based on a range of grouped values from another dataframe using tidyverse
• function for dplyr with argument that defaults to "."
• Removing all rows under a specified row in a time series
• Expand grid with an ordered pair and a third variable in R
• How to keep the timezone when converting POSIXct to character?
• Is there a way to use rowSums and is.numeric to only sum numeric columns?
• Filtering with dplyr by using two separate selection criteria involving two columns
• How to rename multiple observations?
• Use of na.locf function (zoo package) with .SD in data.table
• extract the first part of each string in a data frame in r