Can I call quadprog() using Embedded MATLAB from Simulink?

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H S
H S on 9 Feb 2011
I've developed a Simulink model in which I need to perform a constrained quadratic minimization. I've tried placing a call to the Optimization Toolbox function quadprog in an Embedded MATLAB Function block but have encountered numerous errors. Is what I'm trying to do even allowable and, if so, what is the proper way to do it?

Answers (3)

Kaustubha Govind
Kaustubha Govind on 9 Feb 2011
This is the list of functions supported with Embedded MATLAB.
If your function is not in this list, you can still call it using eml.extrinsic, but you cannot generate code from your model.

James Allison
James Allison on 16 Feb 2011
If you are fine with a simulation-only capability (i.e., no code generation), then you might also consider using a Level-2 MATLAB S-Function in place of EML. You can run quadprog from within the S-Function.

H S
H S on 9 Feb 2011
OK, I can live with only using quadprog() in simulation. However, the following code causes the error "Function output 'delUstar' cannot be of MATLAB type".
function delUstar = fcn(Phi, H, r, Rs, F, x)
eml.extrinsic('quadprog');
f = -2*Phi'*(Rs*r-F*x);
delUstar = quadprog(H,f,[],[]);
It seems that delUstar is of type mxArray and that some sort of conversion is necessary. Any suggestions on how to do this?
  1 Comment
Kaustubha Govind
Kaustubha Govind on 16 Feb 2011
Look for the 'Converting mxArrays to Known Types' section here: http://www.mathworks.com/help/toolbox/eml/ug/bq1h2z8-34.html#bq1h2z9-38

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