amatsuo_net questions

amatsuo_net answers

• Vertically combing multiple bar plots
• R: count 15 minutes interval in time
• Direct way of telling ifelse to ignore NA
• ggplot2: yearmon scale and geom_bar
• Fastest way to read large Excel xlsx files? To parallelize or not?
• ifelse with data.table
• R list get first item of each element
• R data.table: accessing column with variable name