Subroutine Type

Setup utility subroutine for GSE.

Definition

The SET_GSE_ ALGEBRAIC_EQN subroutine is used with GSESUB to specify the implicit, algebraic equation.

Use

Fortran

SET_GSE_ALGEBRAIC_EQN (gse_id, eqn_idx, errflag)

C/C++

c_set_gse_algebraic_eqn (gse_id, eqn_idx, errflag);

Python

py_set_gse_algebraic_eqn(gse_id, eqn_idx, errflag)

Input Arguments

gse_id

Type = integer.

The identifier of the GSE element.

eqn_idx

Type = integer.

The equation index of the algebraic equations.

Output Values

errflag

Type = integer.

Returns information about the call status.

A non-zero value indicates failure.

Comments

However, in some cases, the state equations may involve both differential and algebraic equations.  For example:

When this occurs, it is necessary to tell MotionSolve the equation indices of the algebraic equations associated with the algebraic state X2, using SET_GSE_ ALGEBRAIC_EQN.  For example, call: SET_GSE_ALGEBRAIC_EQN (gse_id, 2, errflag)

into the explicit form that can be solved in MotionSolve.  For example, define:

The implicit form can be converted to the following differential algebraic equations:

This is in the same DAE form shown in the previous remark.