MATLAB: Lsqnonlin question

lsqnonlin

I have a function file called commands.m which gives the necessary inputs to another function file called fit_simp. lsqnonlin is called inside fit_simp.
My commands function file is as follows;
X=xlsread('MR01.xls',8,'AA63:AA133');
Y=xlsread('MR01.xls',8,'W63:W133');
X0=[800 1537 0.1722 7.169e-6 1];
lb = [800;0;0;0;0.7];
ub=[2000;2000;10;10;1];
StartAt = [800;1537;0.1722;7.169e-6;0.0001];
x=lsqnonlin(@(X0)fit_simp(X0,X,Y),StartAt,lb,ub);
And my fit_simp file is as follows;
function diff = fit_simp(x,X,Y)
% This function is called by lsqnonlin.
% x is a vector which contains the coefficients of the
% equation.  X and Y are the option data sets that were
% passed to lsqnonlin.
A=x(1);
B=x(2);
n=x(3);
C=x(4);
m=x(5);
[total_readings,epsilon_dot_QS,epsilon_dot_MR,TM,TR,rho,Cp] = GetMRDetails;
for i=1:total_readings
      if (i~=1)
          d_epsilon=(X(i)-X(i-1));
          sigma=diff(i-1)-Y(i-1);
          dT=abs((1/(rho*Cp))*(sigma*d_epsilon));
          TH=dT/(TM-TR);
          diff(i)=(A+B*(X(i)^n)+C*log(epsilon_dot_QS/epsilon_dot_MR)+(1-(TH)^m));
      else
          diff(i)=(A+B*(X(i)^n)+C*log(epsilon_dot_QS/epsilon_dot_MR));
      end
  end
When I call commands by typing_ >>commands_ in the commands window, I get the following message:
Maximum number of function evaluations exceeded; increase options.MaxFunEvals
But when I type options in the commands window, it tells me;
??? Undefined function or variable 'options'.
Pleae can anyone guide me what is going wrong? How to increase the value of options.MaxFunEvals?Please help…..

Best Answer

You have to use the optimset() function to determine the options that are being referred to here.
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