Lamia questions

Lamia answers

• Add a new column that maps one character string onto a new character string based on a "Rosetta Stone" data frame?
• R: Count unique rows for each unique name per year
• Merge vectors with different length into a matrix one after the other
• why does gsub not replace NA
• Calculating geographic distances to data points with dplyr::mutate
• calculating simple retention in R
• R: Error applied to an object of class "c('integer', 'numeric')"
• R ggplot ordering bars within groups
• R Split String By Delimiter in a column
• splitting multiple values in one column into multiple rows R [duplicate]