KU99 questions

KU99 answers

• How to make a `functools.reduce` implementation that looks similarly as `Reduce` in R?
• Group by using str_detect for groups with similar strings
• Create a new column populated by level names in R
• Which rows/columns are duplicates of which others in R matrices?
• Subtracting rows based on conditions in other columns
• Extract all characters to the left of a list of possible characters
• Create Sub Headers in R
• count distinct and calculate percent differences in two columns ifrom R dataframe
• In R, how create new dataframe with number of occurrences of each strings on other dataframe, like a product list and products in basket sold
• How to find combination of two values such that the ratio and sum of those is fixed to certain numbers with R