Actuall error
>> test
Error using *
Inner matrix dimensions must agree.
Error in test>@(x)2*x(1)*Et_exp+x(2)*Ez_exp+3*x(4)*Et_exp.^2+2*x(5)*Ez_exp*Et_exp+x(6)*Ez_exp.^2
Error in test>@(x,xdata)sum((St_the(x)-St_exp)^2+(Sz_the(x)-Sz_exp)^2)
Error in lsqcurvefit (line 202)
initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Error in test (line 15)
x = lsqcurvefit(fun,x0,St_exp,Sz_exp)
Caused by:
Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.
