Sebastian Zeki questions

• How to collapse all character vectors in a list
• R regular expression to split string column into multiple columns
• Generate random times in sample of POSIXct
• why does gsub not replace NA
• How to rbind when only some of the columns match
• Adding time to time in R
• How to find three consecutive rows with the same value
• How to compare lists in a dataframe
• Find regular expression in one column and add to a new column in same dataframe
• How to create the negative of a sentence in nltk

Sebastian Zeki answers