How to solve the transfer function with summation

syms f i
f= 10e6;
g(1) = 0.09;
g(2) = -0.012;
g(3) = 0.012;
g(4)= -0.012;
g(5) = 0.022;
d(1) = 100; d(2) = 130; d(3) = 160; d(4) = 190; d(5) = 300; 
K= 1;
a0 = 0;
a1 = 1.65e-9;
Vp= 1.53e8;
F = 50;

H(f) = symsum(g(1i).exp-(a0+a1F)^d(1i).exp-(0.000000205*d(1i)*j),1i,1,5);

Answer 1

[Walter Roberson]

MATLAB uses .* or * for multiplication, not period

MATLAB does not have implicit multiplication. MATLAB will not know that a1F is intended to mean a1*F

Your equation does not involve F , it involves f . MATLAB is case sensitive.

MATLAB uses exp(-expression) for , not exp-expression

The second parameter of symsum needs to be a symbolic variable name, but you have used 1i instead.

You are trying to use 1i as an index, but complex numbers can never be used as indices.

When you use symsum(), you can never use the variable of summation as a matrix index.

What you need to do is vectorize:

H(f) = sum( g .* exp(-(a0+a1*f.^k).*d) .* exp(-1j*2*pi*f.*d./Vp) )

[Abishek Vedharathinam Karunakarapandiyan]

Thanks for your help