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

From: Sudipta Sarkar <ssarkar_at_lanworth.com>
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.
thanks

Sudipta Sarkar PhD
Senior Analyst/Scientist
Lanworth Inc. (Formerly Forest One Inc.) 300 Park Blvd., Ste 425
Itasca, IL
Ph: 630-250-0468



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