, 2007 6:40 AM
To: Paul Gilbert; Jiao Yang
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] invert 16x16 matrix
While inverting the matrix may be a problem, if you need to
solve an equation A*x = b you do not need to invert A, there
exist iterative methods which do need A or inv
] invert 16x16 matrix
While inverting the matrix may be a problem, if you need to
solve an equation A*x = b you do not need to invert A, there
exist iterative methods which do need A or inv(A) - all you
need to provide is a function that computes A*x for an
arbitrary vector x
googled
it, yet did not get any good results. Thank you for your time.
Best regards,
Jiao
- Original Message -
From: Patnaik, Tirthankar [EMAIL PROTECTED]
Date: Tuesday, August 14, 2007 2:07 am
Subject: RE: [R] invert 16x16 matrix
To: Moshe Olshansky [EMAIL PROTECTED], Paul
-
From: [EMAIL PROTECTED]
[ On Behalf Of Moshe Olshansky
Sent: Tuesday, August 14, 2007 6:40 AM
To: Paul Gilbert; Jiao Yang
Cc: r-help@stat.math.ethz.ch
Subject: Re: [R] invert 16x16 matrix
While inverting the matrix may be a problem, if you need to
solve an equation
Can R invert a 16x16 matrix with all positive numbers? Thanks a lot!
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You would need 200GB to store a since image, so if you have about 1TB
of physical memory on your computer, it might be possible.
On 8/13/07, Jiao Yang [EMAIL PROTECTED] wrote:
Can R invert a 16x16 matrix with all positive numbers? Thanks a lot!
I don't think you can define a matrix this large in R, even if you have
the memory. Then, of course, inverting it there may be other programs
that have limitations.
Paul
Jiao Yang wrote:
Can R invert a 16x16 matrix with all positive numbers? Thanks a lot!
While inverting the matrix may be a problem, if you
need to solve an equation A*x = b you do not need to
invert A, there exist iterative methods which do need
A or inv(A) - all you need to provide is a function
that computes A*x for an arbitrary vector x.
For such a large matrix this may be slow
