From jg_liao at yahoo.com  Wed Jun  8 18:42:10 2005
From: jg_liao at yahoo.com (Jason Liao)
Date: Wed Jun  8 18:42:19 2005
Subject: [Rd] feature request: enhance solve function with a symmetric
	option for faster operation for symmetric matrix
Message-ID: <20050608164210.72606.qmail@web53704.mail.yahoo.com>

Dear R developers,

Recently I have a simulation program that needs to solve a large number
of linear regression A x = b, where A is symmetric and constantly
chnages. I found that the solve function is considerably less efficient
than 

     solve_symmetric = function(A, B)
      {
         chol2inv(chol(A)) %*% B;
      }

So I would request that the solve function be enhanced with an
symmetric option, which defaults to FALSE, the current solve. But when
symmetric=TRUE, a more efficient algorithm for symmetric matrix is
used. Thanks.

Jason


Jason Liao, http://www.geocities.com/jg_liao
Dept. of Biostatistics, http://www2.umdnj.edu/bmtrxweb
University of Medicine and Dentistry of New Jersey
683 Hoes Lane West, Piscataway? NJ 08854
phone 732-235-5429, School of Public Health office
phone 732-235-9824, Cancer Institute of New Jersey office


[Rd] feature request: enhance solve function with a symmetric option for faster operation for symmetric matrix
Jason Liao