megv questions

• Grep in R to remove entire row if city column cell is blank
• Error in group by using hive
• How to save a histogram from command line in R
• Remove duplicates column combinations from a dataframe in R
• getting the name of a dataframe from loading a .rda file in R
• Create a heatmap of USA with state abbreviations and characteristic frequency in R
• Remove all rows where length of string is more than n
• How to filter for unique combination of columns from an R dataframe

megv answers