Gary Weissman questions

Gary Weissman answers

• How do we plot chessboard (N by N) grid?
• How to fit a model I built to another data set and get residuals?
• How do I read information from text files?
• Determining the area of Shapefiles
• Summarise data into monthly counts by year
• data.table replace NA with mean for multiple columns and by id
• Efficient multinomial sampling when sample size and probability vary
• print or display variable inside function
• Remove Hashes in R Output from R Markdown and Knitr
• How can I check if a matrix is an element of a list of matrices? in R