AndS. questions

AndS. answers

• Overlay two ggplots with different x and y axes scales
• Identify match by row, and create column with the column name of the match
• Extracting 5 words before and after an specific word
• using the %in% operator on multiple columns
• String between first two (.dots)
• R ggplot: "cross effect" in legend (not going away with show.legend = NA)
• How to annotate line plot with arrow and maximum value?
• Unexpected behaviour when piping to ls() in R?
• Compact a data frame by removing some of the NA cells?