aaaaa questions

• split data.frame in two based on one column values
• reduce width of bars in multiple barplot R
• ggplot2 - How to add unique legend for multiple plots with grid.arrange?
• Merge data.frames between two lists by one single column
• ggplot2 - Correctly arrange odd number of plots into one figure
• convert 3 dimensional array into dataframe
• Replace rows with 0s in dataframe with preceding row values diverse than 0

aaaaa answers