MATLAB: Linking simulink from m-file

m-fileMATLABsimulink

By using sim('modelname'); i can open a model from m-file.but if i want to get a particular data/signal from the simulated model,such that the data/signal will be stored in a variable.then what command should i use?

Best Answer

This is a matter of the return variables of the SIM command. This examples code is from the documentation:

Specify parameter name-value pairs within the sim command:

simOut = sim('vdp','SimulationMode','rapid','AbsTol','1e-5',...
          'SaveState','on','StateSaveName','xoutNew',...
          'SaveOutput','on','OutputSaveName','youtNew');

Important is, that you need - like in this example - an "out" Block at the end of the relevant signal(s).

Related Solutions

MATLAB: Return variable of Sim() command

The syntax that you are using was introduced in R2009b. If you're using R2009a or an older release, the second parameter needs to be a timespan vector. Also, you need to use the Backwards Compatible Syntax.

MATLAB: M-file function

Your function is calling itself without approaching any convergance or something that will allow it to end. Therefore it will run forever and eventually out of memory (hence the error). Try splitting it up into a script and a function as so:

Script:

 %creating window of plot from -5 to 50 using stepsize 0.25 for t x-axis
 %t should be on the x axis, v should be on the y axis
 k=0; 
for i= -5:.25:50
    k = k+1;
    t(k)=i;
    v(k)=vPieceWise(t(k));
end 
plot(t,v);
 
figure
plot(t,v);
hold on

Function:

%Part A: Mfile function to compute v as a function of t
function v = vPieceWise(t)
 if (t < 0)
        v = 0;
    elseif (0 <= t)&&(8<=16)
        v = -5*t+10*t.^2;
    elseif (8<=16)&&(t<=16)
        v = 624 - 3*t;
    elseif (t<=16)&&(t<=26)
        v = 12*(t-16).^2+36*t;
    elseif (26<t)
        v = 2136*exp(-0.1*(t-26));
 end

Best Answer

Related Solutions

MATLAB: Return variable of Sim() command

MATLAB: M-file function

Related Question