Re: [R] Applying user function over a large matrix

From: Sudipta Sarkar <>
Date: Tue, 29 Apr 2008 16:28:57 -0400 (EDT)

Hi Jim,
Thanks for your prompt response,

I am using a fairly powerful Mac with Leopard OS and 17GB RAM and 2x3 GhZ intel zeon processor so I do not think the system is paging. I also using the Rmpi and snow utilities to parallelize it but even then it takes 3.5-4 hours to just complete one chunk of matrices.
You mentioned about storing the data and applying on 1 column at a time. Any hint on how I should I go about doing that? I cam across the filehash package but am not sure how to use apply over an environment variable. So any help in this direction will be most welcome.

Sudipta Sarkar PhD
Senior Analyst/Scientist
Lanworth Inc. (Formerly Forest One Inc.) 300 Park Blvd., Ste 425
Itasca, IL
Ph: 630-250-0468 mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Tue 29 Apr 2008 - 20:30:07 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 29 Apr 2008 - 21:30:39 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive