2015 OPR After Week Three Events

[Citrus Dad]

Originally Posted by Ed Law

Thank you for being patient. The World OPR now has the components published. The memory problem I had was due to the A(T) * A operation. With 40-60 teams, that is not a big deal. But when I calculate the World Component OPR, after 3 weeks, we have about 1800 teams. That is a 1800 X 1800 matrix and a total of over 6 billion multiplications and 6 billion additions.

I finally have to swap the rows and columns of the matrix to reduce the amount of memory paging in and out. It still took over 10 minutes on my i5 computer with 4 GB of memory. It is done. I am not looking forward to when there are 2900 teams after 6 weeks of competition. It will take over 40 minutes just to calculate that A(T) * A.

I need a faster computer to do this! May be I will borrow our team's CAD workstation to run this. It has an i7 and tons of memory.

It may be that you have to move to a statistical / econometric package like STATA which can handle larger data sets? Or have you tried R?