KU99 questions

KU99 answers

• Turning vectors of strings in a dataframe into categorical variables in R
• How to test if object has "as.matrix" method?
• Estimating area curve between two curves
• how to find identical string in various columns of a data frame
• Grouped rolling average
• Extract every combination of numeric values once they reach a target sum
• Find roots of the equation in R
• How to create a matrix with four 1's in each row staggered
• How to loop through a predefined list of variable and mutate many new columns in R?
• How to tidy messy data [closed]