![Timing performance improvements due to vectorization](https://blogs.sas.com/content/iml/files/2013/05/BLASTiming.png)
Last week I discussed a program that had three nested loops that used scalar operations in the innermost loop. I mentioned that this program was not vectorized, and would therefore be slow in a matrix language such as SAS/IML, MATLAB, or R. I then went through a series of steps