[R] Efficient testing for +ve definiteness

2005-07-13 Thread Makram Talih
<= 0)" seems less efficient than going through the LU decomposition invoked in "determinant.matrix(A)" and checking the sign and (log) modulus of the determinant. I suppose this has to do with the underlying C routines. Any thoughts or anecdotes? Many Thanks, Makram Talih -- Mak

[R] trouble with cumsum?

2005-05-29 Thread Makram Talih
n outcome? Thanks in advance for any clarifications any of you can offer. Regards, Makram Talih -- Makram Talih, Ph.D. Assistant Professor Department of Mathematics and Statistics Hunter College of the City University of New York 695 Park Avenue, Room 905 HE New York, NY 10021 Website: http://st

[R] NULL object, R programming

2003-02-27 Thread Makram Talih
inor6.2 year 2003 month01 day 10 language R Many thanks for any clarifications regarding this! Regards, Makram Talih Yale University Statistics __ [EMAIL PROTECTED] mailing list

[R] NULL object, R programming

2003-02-27 Thread Makram Talih
inor6.2 year 2003 month01 day 10 language R Many thanks for any clarifications regarding this! Regards, Makram Talih Yale University Statistics __ [EMAIL PROTECTED] mailing list