Re: built in matrix-algebra routines
Hi Everyone, I concur with John Vokey's suggestions. I would add the following too: -Functions to create NxN Identity matrices, and 1xN or Nx1 vectors of ones. -A function to create a matrix of deviations-from-mean from a data matrix. -A function to create uncentered and centrered covariance matrices from a data matrix. Regards, Greg On 18/11/2000 8:09 AM, John Vokey wrote: >1) matrix multiplication, inversion, transposition, addition, subtraction, >normalize, but also commands to work arithmetically on elements, and to >extract columns, rows, sort columns, rows, etc.. > >2) eigendecomposition (i.e., eigenvalue and eigenvector extraction, as with >the "eig" routine in Matlab)), and singular value decomposition (SVD). _ Gregory Lypny Associate Professor of Finance Concordia University _ "Take chances, make mistakes!" - Ms Frizzle, The Magic School Bus Archives: http://www.mail-archive.com/metacard@lists.runrev.com/ Info: http://www.xworlds.com/metacard/mailinglist.htm Please send bug reports to <[EMAIL PROTECTED]>, not this list.
built in matrix-algebra routines
on 11/17/00 1:50 AM, [EMAIL PROTECTED] at [EMAIL PROTECTED] wrote: Scott Raney <[EMAIL PROTECTED]>wrote: > I second the motion: we are already planning to add some features in > this area for the next release and a list of the most useful matrix > operations to have built in would be very handy for planning purposes. 1) matrix multiplication, inversion, transposition, addition, subtraction, normalize, but also commands to work arithmetically on elements, and to extract columns, rows, sort columns, rows, etc.. 2) eigendecomposition (i.e., eigenvalue and eigenvector extraction, as with the "eig" routine in Matlab)), and singular value decomposition (SVD). -- Tom Szasz once quipped [approximately]: When I talk to God, it's called prayer; but when God talks to me, it's called schizophrenia! John R. Vokey, Ph.D. Chair Department of Psychology and Neuroscience University of Lethbridge Archives: http://www.mail-archive.com/metacard@lists.runrev.com/ Info: http://www.xworlds.com/metacard/mailinglist.htm Please send bug reports to <[EMAIL PROTECTED]>, not this list.
