Concerning MATLAB vector-valued constraint functions

[sh-cau]

Hi,
I have a problem setup where it would be convenient (if not essential) if NLopts MATLAB interface could handle vector-valued constraint functions as described in the NLopt General Reference in the Vector-valued constraints section. If I understood correctly, the MATLAB interface should be able to achieve this but I do not see how. I think this was already mentioned here, but the solution said that you would have to pass m separate function handles into the cell array which is not what I need.
Essentially, I want to have one function that evaluates m constraints at once and returns the result as a vector. I only want to pass e.g.

opt.fc = {@(x)myconstraint(x)}

where

function [ fc_ ,gradfc_ ] = myconstraint(x) 
     fc_(1) = x(1)-x(2);   
     fc_(2) = x(2)^2+x(1);  
            .  
            .  
            .  
     fc_(m) = x(4)-x(3)*x(2);  

     if nargout > 1  
       % calc gradient
     end
end

But this results in the error
Error using nlopt_optimize user function must return real scalar

Thank you in advance.

[jiyess]

Hi,
I have the same problem. Do you have solve the problem?

I don't find the solution!
Thanks for the help.

[sh-cau]

Hi,
I have the same problem. Do you have solve the problem?

I don't find the solution!
Thanks for the help.

Unfortunately, I have not looked too deep into this. Therefore, no solution yet. Sorry

[jiyess]

Hi,
I have the same problem. Do you have solve the problem?
I don't find the solution!
Thanks for the help.

Unfortunately, I have not looked too deep into this. Therefore, no solution yet. Sorry

Thank you all the same! : )