JDL questions

JDL answers

• Extend an R S4 object to have new slots and keep the original object working the same way
• Override Method in R 2.15
• How do you extend rbind for a data.frame subclass?
• Sampling from a given probability distribution using R
• how to set value in S4 object r using a method (no input value needed)
• Vectorize an S4 class in R