# Plotting infinite series with set of parameters

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Moslem Uddin on 8 Sep 2019
Commented: Moslem Uddin on 10 Sep 2019
I want to plot the following functions, Here, and given by  is a set of values of values given by, I have approximated a set of values for . I have tried the following code, but failed to generate expected plot. Is that due to approximation, or there is any other error in my code?
clc
clear all
syms Y
k = 0.1;
j=[-8.0671,-5.30732,-2.62768,0,8.0671,5.30732,2.62768];
for i=1:length(j)
f1 = (sin(j(i))+ k*j(i)*cos(j(i)))*cos(j(i)*Y) - (cos(j(i)) - k*j(i)*sin(j(i)))*sin(j(i)*Y);
f2=((((j(i).^4)/16)+1)*((k*(k + 1)*sin(j(i))) - (1 + 2*k - k^.2*j(i).^2)*((cos(j(i)))/(2*j(i)))));
U=0.25*sum(((f1/f2)*exp(-0.25*j(i).^2)),i,1:8);
fplot(U);xlim([0 1]);%hold on;
end

darova on 8 Sep 2019
Maybe it's a bit complicated for symbolic function fplot()?
Did you try to plot numerically?
What about . Where is τ? Is it 2D plot (surface)?
Moslem Uddin on 8 Sep 2019
I have considered $\tau=1$
Moslem Uddin on 8 Sep 2019
It’s not a surface plot.

darova on 8 Sep 2019
Looks like simple sin() or cos():  What do you think?
Try my script, i think i reached a success

darova on 10 Sep 2019
Do you have a source formula? Hard to see it in the script
darova on 10 Sep 2019
Try to write clearer script. Hard to understand it if everything is written in one line
You forgot the dot
Also declaring y two times Moslem Uddin on 10 Sep 2019
Thanks a lot!