Estimation of the Arterial Wall Material Properties by Using Strain Energy Function and Inflation-Extension Experiment (for two arteries)

Anyone please help me with this

[Muhammad Asif]

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.