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Viewing and retaining the eigenstructure

If you wish to see the eigenvalues and, optionally, the eigenvectors as determined by the command, you must use the eig  or eig+  option beforehand. Otherwise, some of the results from the EIGEN:  command are available as [B/D] operators and operands. They are as follows:

The Eigenvectors may be retained optionally as assignments by using the eig  argument to the KEEP:  command, before issuing the EIGEN:  command.

As an example, suppose that we wish to calculate and display the eigenstructure of a variance matrix specified over some collection of n quantities tex2html_wrap_inline38888 in belief store 2; and that we wish to retain the eigenvectors for later use as the assignments tex2html_wrap_inline38892 . The following sequence of commands achieves this aim:

BD>keep : eig  = Z tex2html_wrap_inline33712

BD>option : eig+  tex2html_wrap_inline33712

BD>eigen : v(2,B) tex2html_wrap_inline33712

 



David Wooff
Wed Oct 21 15:14:31 BST 1998