RHertel questions

RHertel answers

• How to get multiple means scores from a variable in R
• Multiply each component of vector by another vector (resulting in vector of length m*n)
• Referring one data frame to perform analysis on another data frame
• Create new columns based on rows
• How to set thousands separator in R?
• nested ifelse in R so close to working
• Call an object using a function in R
• as.POSIXlt ignores tz argument
• R, how can I make a heatmap out of a simple matrix? [duplicate]
• R Optimal way to create time series from start and end dates for groups