MATLAB: Problem with while loop

MATLAB

I wrote 3 functions and i wanted to link them in main function. In the main function i wrote a while loop . i am facing problem with this while loop. . The loop is running with initial values, i.e., it is not updating the values of rcapa, capaPAMin, and Bineq. The main function runs as follows

How to correct this problem.

global Bineq1; capaPAMin = inf; Bineq2 = capaPAMin; Bineq = vertcat(Bineq1,Bineq2); iter = 1; while(iter <=15) DA2 = @(Bineq,capaPAMin) somefunction(c1,c2,c3,c4,c8,capaPAMin,Aineq,Bineq,Aeq,Beq,lb2,ub2); [yd2,DAC2] = DA2(Bineq,capaPAMin); td2 = yd2(1345:1728); — — — rcapa — — PA2 = @(rcapa) somotherfunction(c5,c6,c7,Aineq,Bineq,Aeq,rcapa,lb1,ub1); [yp2,PAC2] = PA2(rcapa); b = yp2(385:576); — — capaPA — — if capaPAMin > capaPA capaPAMin = capaPA; end Bineq2 = capaPAMin; Bineq = vertcat(Bineq1,Bineq2); iter = iter + 1; end

Best Answer

In the code you've provided, the variables ( rcapa, capaPA) are not defined.

Moreover even if you define it in the beginning, they are not influenced by any of your functions. So they wouldn't change but stay in its initial conditions.

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MATLAB: What cause fmincon stop prematurely

Your function has logarithms and division. It seems to me quite likely that fmincon steps into a region where the function is undefined, and cannot proceed.

I suggest that you do two things:

Ensure that your initial point x0 evaluates to a finite value.
Use the interior-point algorithm, which is robust to occasional evaluation failures.

Good luck,

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MATLAB mathematical toolbox documentation

MATLAB: Calling a function in another function by changing only few input arguments

If you are in another function where variables with the same names are defined (e.g. because they are arguments of the function), but you want to create a wrapper for PAgent as a function of 1 parameter rcapa that calls another function with the same parameters but with this one updated, do it this way:

 function otherFunction( c5,c6,c7,rcapa,Aineq5,Bineq5,Aeq5,Beq5,lb,ub,options ) 
    PA1 = @(rcapa) PAgent( c5,c6,c7,rcapa,Aineq5,Bineq5,Aeq5,Beq5,lb,ub,options ) ;

then you can call PA1 with the specific value of rcapa, but all the other arguments will remain the same as defined by/in otherFunction.

This is like creating an internal function. All variables that are not defined locally come from the nesting/external function. The only internal/local variable in

 PA1 = @(rcapa) PAgent( c5,c6,c7,rcapa,Aineq5,Bineq5,Aeq5,Beq5,lb,ub,options ) ;

is rcapa.

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MATLAB: What cause fmincon stop prematurely

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