MATLAB: Matrix dimensions do not agree

matrix dimensions

This is my script:
function Langner_Ue1
    load data1 P v; 
    Vmax3 = 4; 
    S2 = 40-P; 
    Km3 = 3; 
    k1 = 30; 
    P0 = [Vmax3, Km3, k1]; 
    lsqcurvefit(@Michaelis_Menten_Substratinhibierung_2, P0, S2, v) 
    figure(2) 
    plot(S2,v,'r*') 
    hold on 
    plot(S2,vMMI2,'r') 
    hold on 
    legend('v über S', 'MMI2 über S') 
    end 
    function MMI2 = Michaelis_Menten_Substratinhibierung_2(Vmax3, S2, Km3, k1) 
    MMI2 = (Vmax3.*S2)./(Km3+S2+(S2.^2./k1)); 
    end
Matrix dimensions must agree.
Error in Langner_Ue1>Michaelis_Menten_Substratinhibierung_2 (line 40) MMI2 = (Vmax3.*S2)./(Km3+S2+(S2.^2./k1));
Error in lsqcurvefit (line 213) initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Error in Langner_Ue1 (line 30) lsqcurvefit(@Michaelis_Menten_Substratinhibierung_2, P0, S2, v)
Caused by: Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.
If I perform the function 'Michaelis_Menten_Substratinhibierung_2' directly in the command window there is no failure and verything works fine. Why do I get a failure when I try to run the script?

Best Answer

Try this:
    load data1 P v; 
    Vmax3 = 4; 
    S2 = 40-P; 
    Km3 = 3; 
    k1 = 30; 
    P0 = [Vmax3, Km3, k1]; 
    P = lsqcurvefit(@Michaelis_Menten_Substratinhibierung_2, P0, S2, v);
    MMI2 = Michaelis_Menten_Substratinhibierung_2(P, S2);
    figure(2) 
    plot(S2,v,'r*') 
    hold on 
    plot(S2,vMMI2,'r') 
    hold on 
    legend('v über S', 'MMI2 über S') 
    end 
    function MMI2 = Michaelis_Menten_Substratinhibierung_2(P, S2) 
    Vmax3 = P(1);
    Km3 = P(2);
    k1 = P(3);
    MMI2 = (Vmax3.*S2)./(Km3+S2+(S2.^2./k1)); 
    end
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