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3.6.5 GetEquations
Command structure of GetEquations.
Given a DAEObject dae, GetEquations returns the equation system stored in the object as a list of equations. In case of an AC DAEObject the internal matrix representation is converted to a list of linear equations.
See also: GetMatrix, GetVariables, GetRHS, GetParameters, GetDAEOptions, GetDesignPoint.
Examples
Load Analog Insydes.
In[1]:= <<AnalogInsydes`
Define netlist description of a simple diode rectifier circuit.
In[2]:= cir =
Circuit[
Netlist[
{V0, {1, 0}, Symbolic -> V0,
Value -> 2. Sin[10^6 Time]},
{R1, {2, 0}, Symbolic -> R1, Value -> 100.},
{C1, {2, 0}, Symbolic -> C1, Value -> 1.*^-7},
{D1, {1 -> A, 2 -> C}, Model -> "Diode"}
]
]
Out[2]= 
Set up Transient DAE system.
In[3]:= dae = CircuitEquations[cir, AnalysisMode -> Transient,
DefaultSelector -> "Spice", ElementValues -> Symbolic]
Out[3]= 
Return list of equations.
In[4]:= GetEquations[dae]
Out[4]= 
Set up AC DAE system.
In[5]:= daeac = CircuitEquations[cir, AnalysisMode -> AC,
DefaultSelector -> "SpiceAC", ElementValues -> Symbolic]
Out[5]= 
The system is set up as a matrix equation.
In[6]:= DisplayForm[daeac]
Out[6]//DisplayForm= 
Return value is again a list of equations.
In[7]:= GetEquations[daeac]
Out[7]= 
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