Helen questions

• mapply with multiple arguments where one argument is constant (data)
• Grid search with LightGBM regression
• Plot year below month on x axis
• need to count number of specific transitions in a vector in R
• R: is there an equivalent of diff(x) for dividing?
• R: unequi join with merge function
• R: apply vs do.call
• Split date rows by new year

Helen answers