Nneka questions

• only append list elements that are not "TRUE"
• adding a label in geom_line in R
• Alternative to cut function in R for data.tables - integer variables to factors
• data.table - summarizing data - difference between `by` and `keyby`?
• Merge multiple .csv files into one [duplicate]
• Attempt to set "sep" / "dec" ignored: Error in write.csv format - R

Nneka answers