# Plotting truncated FS expansion

32 views (last 30 days)
Arman Allahverdi on 18 Mar 2020
Answered: Ayush Gupta on 27 Mar 2020
For the following Y[k], I want to plot y(t) between and :
Where L, C are constants that I've already defined.
I'm trying this:
t=linspace(-pi*10^-3,pi*10^-3);
syms k
y = symsum((1/pi * i * 1000 * sin(pi*k/2))/(1/C + i*1000*k + L(i*1000*k).^2) * exp(i*k*1000*t),k,-99,99);
Which gives the following error:
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables, and function body must be sym expression.

Ayush Gupta on 27 Mar 2020
The following code is implemented with the assumption of C and L to be 1 as they are constants and it works fine and plots the graph of y.
t=linspace(-pi*10^-3,pi*10^-3);
syms k
y = symsum((1/pi * 1i * 1000 * sin(pi*k/2))/(1 + 1i*1000*k + (1i*1000*k).^2) * exp(1i*k*1000*t),k,-99,99)
plot(t,y)

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