Matrix

Creating a matrix from a long data.frame

There can never be too many examples for transforming data with R. So, here is another example of reshaping a data.frame into a matrix. Here I have a data frame that shows incremental claim payments over time for different loss occurrence (origin) years.

The format of the data frame above is how this kind of data is usually stored in a data base. However, I would like to see the payments of the different origin years in rows of a matrix.