$OMEGAP

$OMEGAP, $OMEGAPD

Gives prior information for OMEGAs.

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 $OMEGAP  value1  [value2]  [value3] ...
 $OMEGAPD  value1  [value2]  [value3] ...

;# Example
;# Prior to OMEGA (NETPxNETP=4x4 of them)
 $OMEGAP BLOCK(4)
 0.2 FIX
 0.0  0.2
 0.0  0.0 0.2
 0.0  0.0 0.0 0.2
;# Set degrees of freedom of OMEGA Prior (one value per OMEGA block)
 $OMEGAPD (4 FIX)

DISCUSSION

These are called the informative forms (i.e., informative record names) of the $OMEGA record, for use with the NWPRI utility.

$OMEGAP gives prior information for elements of the OMEGA matrix. $OMEGAPD gives degrees of freedom (also called the dispersion factor) for OMEGA priors.

The name of the record describes the kind of information it gives, rather than the structure of the information. E.g., in the example above, $OMEGAPD is implemented in FCON with a $THETA record because it is always a vector of values. These records may be located anywhere in the control stream. NM-TRAN inserts the corresponding records in the control stream in the correct order. When the informative forms are used, the options of $PRIOR NWPRI need not be specified. However, if options are listed in $PRIOR NWPRI, then these values are chosen over what is surmised from the informatively labeled theta/omega/sigma records.

(See NWPRI).

OPTIONS

The option FIXED should be used. Other appropriate options are BLOCK and VALUES.