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Other retentions

Belief comparison canonical directions
 


tex2html_wrap_inline33790 tex2html_wrap_inline33790 Syntax

  1. BD>keep : bcd =A tex2html_wrap_inline33712

  2. BD>keep : -bcd  tex2html_wrap_inline33712

where A is the name of an assignment.

tex2html_wrap_inline33806 tex2html_wrap_inline33806

The first form of the syntax is used to switch on the retention of the generalised eigenvectors (canonical directions) resulting from a comparison of belief hypotheses about a collection of quantities, X, by using the COMPARE:  command. These generalised eigenvectors are linear combinations, tex2html_wrap_inline40586 of the quantities in the collection. The corresponding pair of eigenvalues is available via the bcd1  and bcd2  operators.

These linear combinations are retained as assignments, using the supplied name ``A'' as a stem. tex2html_wrap_inline40588 will be stored as the assignment whose name is A1, tex2html_wrap_inline40592 as the assignment whose name is ``A2'', and so forth. The constant part of the canonical direction is included in the stored assignment. The name ``A'' supplied must not include a ``.'' character.

The switch remains on until switched off. Consequently, care must be taken not to overwrite the generalised eigenvectors stored as assignments by ones emanating from fresh belief comparisons, unless this is what is desired.

The second form of the syntax is used to switch off the automatic storing of the generalised eigenvectors as assignments. Any assignments so defined during previous belief comparisons remain defined.  

Eigenvectors
 


tex2html_wrap_inline33790 tex2html_wrap_inline33790 Syntax

  1. BD>keep : eig =A tex2html_wrap_inline33712

  2. BD>keep : -eig  tex2html_wrap_inline33712

where A is the name of an assignment.

tex2html_wrap_inline33806 tex2html_wrap_inline33806

The first form of the syntax is used to switch on the retention of the eigenvectors resulting from the computation of the eigenstructure implied by using the EIGEN:  and INVERT:  commands for beliefs specified over a collection of quantities, X. The eigenvectors are linear combinations, tex2html_wrap_inline40586 of the quantities in the collection.

These linear combinations are retained as assignments, using the supplied name ``A'' as a stem. tex2html_wrap_inline40588 will be stored as the assignment whose name is A1, tex2html_wrap_inline40592 as the assignment whose name is ``A2'', and so forth. No constant part is included in the stored assignment. The name ``A'' supplied must not include a ``.'' character.

The switch remains on until switched off. Consequently, care must be taken not to overwrite the eigenvectors stored as assignments by ones emanating from fresh calculations of eigenstructure using the INVERT:  and EIGEN:  commands, unless this is what is desired.

The second form of the syntax is used to switch off the automatic storing of the eigenvectors as assignments. Any assignments so defined during previous calculations of eigenstructures remain defined.  

 


next up previous contents index
Next: Output options Up: Interactively retaining output Previous: Recording input and output

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