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| PRDPK2 |
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MEANING: PREDPP-PK common
CONTEXT: PK routine
USAGE:
COMMON /PRDPK2/ MTDIFF
INTEGER MTDIFF
DISCUSSION:
MTDIFF is of interest when model time parameters MTIME are used.
The value of MTDIFF is 0 when PK is called. If PK sets MTDIFF to a
value other than 0, e.g., MTDIFF=1, then PREDPP will understand that
with that call to PK, the values of one or more of the MTIME(i) have
possibly been reset.
It is not necessary to set MTDIFF at a call to PK with the first
record of an individual or with a reset record. At such calls, it is
assumed that all MTIME(i) are being set (if only to their default
value of 0).
Suppose PK has defined a value MTIME(i). PREDPP calls PK prior to the
advance to MTIME(i). PK may change MTIME(i) at this call. However,
the new value of MTIME(i) is ignored till after the advance. Only
then is the new value of MTIME(i) effective.
MTDIFF=0 (the default) can save considerable run time when there are
many model time parameters. Note that the results are unpredictable
if the times are in fact changed when MTDIFF=0.
(See mtime, model time examples).
REFERENCES: None.
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