MKR questions

MKR answers

• R Replace values based on conditions (for same ID) without using for-loop
• How can we apply tidyr:: spread() to all categorical variables at once creating new columns for each level of each categorical variable? [duplicate]
• R: parse large unstructured xml file
• C++ "Pure virtual method called" with use of abstract baseclass [duplicate]
• Subsetting a dataframe based on summation of rows of a given column
• creating a matrix/dataframe with two for loops in R
• How to add empty row to data.table if nrow=0?
• Paste values from a vector to column names in R
• Complex conditional mutating: Create new variable with conditional mutating using only past observations for a given participant?
• Calculating age of peak performance in R [duplicate]