MATLAB: Calculate summation with loop or sum

sum plot for loop

Hello,
I have to calculate and plot the attached equation in MatLab using a FOR loop or the sum function. Please Help me !
here is my code: 
 % code
    clc
    clear all;
    f=(0:10e3:1e6);
    a =-48.38  ;
    b =0.41  ;
    c =-25.32  ;
    S1 = a.*f.^b+c;
    Amp=[33.37,29.67,10.05,16.38];
    Freq = [25.02e-3,34.30e-3,66.64e-3,88.25e-3];
    Eca=[3.37,3.46,1.47,0.79];  
    S2=0;
for i=1:numel(Amp)
    ai = Amp(i);
    fi =Freq(i);
    ei =Eca(i);
    S2=S2+ai.*((-1)*exp((f-fi).^2./(2.*ei.^2)));
end
    S=S1+S2;
figure(1)
    plot(f,S,'*b','linewidth',1), 
    grid on

Best Answer

for i=1:numel(f)
  f_actual = f(i);
  S(i) = a*f_actual^b+c+sum(Amp.*exp(-(f_actual-Freq).^2./(2*Eca.^2)));
end
plot(f,S)
I don't know the reason for the (-1) in your code.
Best wishes
Torsten.
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