Other retentions

Belief comparison canonical directions

 

Syntax

1. BD>keep : bcd =A

2. BD>keep : -bcd 

where A is the name of an assignment.

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, 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. will be stored as the assignment whose name is A1, 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

 

Syntax

1. BD>keep : eig =A

2. BD>keep : -eig 

where A is the name of an assignment.

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, of the quantities in the collection.

These linear combinations are retained as assignments, using the supplied name ``A'' as a stem. will be stored as the assignment whose name is A1, 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.