Plotting truncated FS expansion

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Arman Allahverdi
Arman Allahverdi 2020-3-18
回答： Ayush Gupta 2020-3-27
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.

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回答（1 个）

Ayush Gupta
Ayush Gupta 2020-3-27
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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