how to assign x0 value in matlab s-function

Help me, please

when i try to use s-function in a simulink blocket,for identification process parameters using UDRLS algorithm, if i give x0=[1 1] i got output as 1 1. Help me that how to i give x0 value to get correct output.

Following is function i am using

function [sys,x0,str,ts] = estimatorTTTudrls(t,x,u,flag)

   switch flag,
  %%%%%%%%%%%%%%%%%%
  % Initialization %
  %%%%%%%%%%%%%%%%%%
  case 0,
  [sys,x0,str,ts]=mdlInitializeSizes;
  %%%%%%%%%%%%%%%
  % Derivatives %
  %%%%%%%%%%%%%%%
  case 1,
  sys=mdlDerivatives(t,x,u);
  %%%%%%%%%%%
  % Outputs %
  %%%%%%%%%%%
  case 3,
  sys=mdlOutputs(t,x,u);
  %%%%%%%%%%%%%%%%%%%
  % Unhandled flags %
  %%%%%%%%%%%%%%%%%%%
  case { 2, 4, 9 },
      sys = [];
  %%%%%%%%%%%%%%%%%%%%
  % Unexpected flags %
  %%%%%%%%%%%%%%%%%%%%
  otherwise
  error(['Unhandled flag = ',num2str(flag)]);
  end
  % end wpfun1
  %
  %
  function [sys,x0,str,ts]=mdlInitializeSizes
  sizes = simsizes;
  sizes.NumContStates = 0;
  sizes.NumDiscStates = 2;
  sizes.NumOutputs = 2;
  sizes.NumInputs = 9;
  sizes.DirFeedthrough = 2;
  sizes.NumSampleTimes = 1;
  sys = simsizes(sizes);
  %x0=[10;10]
  %x0 = [0 1];
  str = [];
  ts = 1;
  % end mdlInitializeSizes

function sys=mdlDerivatives(t,x,u)
%modelparameters zijn nu input
na=1;
nb=1;
nc=0;
d=1;
Fin=1000;
lam1=1;
lam0=1;
% input
u1=u(1); %oC
y=u(2); %oC
x(1)=B;
x(2)=A;
[B,A]=udrls(y,u,na,nb,d,Fin,lam1,lam0);
sys = [x(1); x(2)];
% end mdlDerivatives

function sys=mdlOutputs(t,x,u)
sys = x;
% end mdlOutputs

[Kaustubha Govind]

Have you tried setting breakpoints in your S-function to debug the issue?

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