ekoam questions

ekoam answers

• How to remove the last word of a string, but only if the other words have at least one duplicate?
• R programming, row-wise data frame calculation with custom script (for every i) to solve "bridge game"
• Count and filter data based on paired data/every two rows?
• fread: empty string ("") in na.strings is not interpreted as NA
• How to perform conditional mutate on unspecified columns (e.g. matching regex)?
• Calculate number of observations in each node in a decision tree in R?
• How to create combinations of values of one variable by group using tidyverse in R
• (tidyverse approach) calculating rowsum across several columns where info on columns to include comes from a different data frame
• How to group rows in a range and consider a 3rd column?
• Extract data frames from nested list