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174
Adams/Solver
Use
Corresponding Statement
GSE_DERIV
Calling Sequence and Structure
SUBROUTINE GSE_DERIV (ID, TIME, PAR, NPAR, DFLAG, IFLAG, NS, XDOT)
Input Arguments
id An integer variable containing the ID of the GSE statement requesting
information from the GSE subroutine. From the identifier, Adams/Solver
automatically recognizes other information (such as the PAR argument)
that is associated with that GSE statement.
time A double-precision variable containing the current simulation time.
par A double-precision array containing the constant parameters taken in
order from the USER parenthetical list in the GSE statement.
npar An integer variable containing the number of constants in the
Function=USER(...) parenthetical list in the GSE statement. The primary
purpose is to provide the subroutine with the number of entries in the par
array.
dflag A logical variable that is set to true when Adams/Solver calls the
subroutine to obtain partial derivatives of the function fc().
iflag A logical variable that is set to true when Adams/Solver calls the
subroutine during the code initialization pass. For other evaluation
subroutines, the flag is used when Adams/Solver needs functional
dependency information and normally controls calls to the SYSFNC and
SYSARY utility subroutines. You can use the IFLAG argument to control
any other initialization you might need to do in the GSE evaluation
subroutine.
ns An integer variable containing the number of continuous states in the
GSE; taken from the NS argument to the GSE statement.
Output Arguments
xdot A double-precision array of dimension NS, containing the derivatives of
the state Xc.
Examples
For an example of this subroutine, see gse_deriv.f