MATLAB: Set initial value for a signal and then rewrite it

algebraic loopinitial valuesignal initialsimulink

Hi, I have a loop in which an observer observe the states and then backward it to a controller. There need to be an initial value for one signal. That signal will start the simulations and gets other values in the loop. Does anyone know how to set the initial value for such system in Simulink?

Best Answer

Hi!

As far as I understand you are looking for a way in which you can specify the initial value for a signal in a Simulink model.

Probably the IC block will fit your needs.

The IC block sets the initial condition of the signal at its input port, for example, the value of the signal at the simulation start time (t_start). The block does this by outputting the specified initial condition when you start the simulation, regardless of the actual value of the input signal. Thereafter, the block outputs the actual value of the input signal.

Hope this helps!

Regards,

Jyotish

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MATLAB: Initial Condition (IC) block does not output initial state

Hi Luca,

the algebraic loop needs to be solved by Simulink in each time step, including the very first step. The output of the IC block is used as starting point for the nonlinear solver for solving the loop. At the end of the timestep (i.e., after solving the algebraic equation), the output is usually not the value of the IC block (only in those cases, where the IC gives the correct value already, i.e., the IC block gives the result of the algebraic equation).

Hope this helps,

Titus

MATLAB: Rewriting a loop construct

if you want to plot for i=1 to i=4,

for i=1:4

 subplot(4,1,i+1);
 plot(x,y); 
 title('Original');
 end

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MATLAB: Initial Condition (IC) block does not output initial state

MATLAB: Rewriting a loop construct

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