model.ode()

Create global equations (ODEs and DAEs).

Syntax

model.ode().create(<tag>);

model.ode(<tag>).state(<statelist>);

model.ode(<tag>).state(<pos>,<state>);

model.ode(<tag>).ode(<state>,<equation>);

model.ode(<tag>).descr(<state>,<descr>);

model.ode(<tag>).weak(<wlist>);

model.ode(<tag>).weak(<pos>,<wexpr>);

model.ode(<tag>).discrete(<boolean>);

model.ode(<tag>).valueType(prop);

 

model.ode(<tag>).state();

model.ode(<tag>).ode(<state>);

model.ode(<tag>).descr(<state>);

model.ode(<tag>).weak();

model.ode(<tag>).discrete();

model.ode(<tag>).valueType();

Description

 model.ode(<tag>) returns a global equation (or an ODE or a DAE) with tag <tag>.

 model.ode().create(<tag>) creates an global equation with tag <tag>.

 model.ode(<tag>).state(<statelist>) sets the states of the global equation tagged <tag> according to the list <statelist>.

 model.ode(<tag>).state(<pos>,<state>) edits the state at position <pos> in the state vector for the global equation <tag>.

 model.ode(<tag>).ode(<state>,<equation>) sets the equation for the state <state>. If the state variable has not previously been added using model.ode(<tag>).state(<statelist>) then <state> is appended to the list of state variables.

 model.ode(<tag>).descr(<state>,<descr>) sets the description for the state <state>.

 model.ode(<tag>).weak(<wlist>) set weak equations. <wlist> is a list of weak expressions.

 model.ode(<tag>).weak(<pos>,<wexpr>) sets the weak expression at position <pos> in the list of weak expressions.

 model.ode(<tag>).state() returns the state variables as a string array.

 model.ode(<tag>).ode(<state>) returns the global equation for the state variable <state> as a string.

 model.ode(<tag>).descr(<state>) returns the description of the state variable <state> as a string.

 model.ode(<tag>).weak() returns the weak equations as a string vector of weak expressions.

model.ode(<tag>).discrete(true) specifies that the global equation contains event states.

model.ode(<tag>).valueType(prop) specifies value type as real or complex when splitting of complex variables in real and imaginary parts has been turned on.

model.ode(<tag>).valueType() returns the value type.

Example

Define a global equations with the variables u and w, the ODEs ut+1 = 0 and vt+1 = 0, where the subscript t indicates the derivative with respect to time. Also define a weak expression test(u)·v.

Code for use with Java

Model model = ModelUtil.create("Model");

model.ode().create("ode1");

model.ode("ode1").ode("u","ut+1");

model.ode("ode1").ode("v","vt-1");

model.ode("ode1").weak(new String[]{"test(u)*v"});

Code for use with MATLAB

model = ModelUtil.create('Model');

model.ode.create('ode1');

model.ode('ode1').ode('u','ut+1');

model.ode('ode1').ode('v','vt-1');

model.ode('ode1').weak({'test(u)*v'});

See Also

model.init(), model.solverEvent()