How to sum a series of functions and then plot the sum?
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Shaun Pedicini
il 1 Mar 2018
Commentato: Abraham Boayue
il 5 Mar 2018
This function is supposed to be able to plot a box filter:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/170891/image.png)
That should possibly look like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/170892/image.png)
I already defined t as a 1x360 double array using:
t = t = linspace(0, 4, 360)
syms k
z = symsum( (1 / k) * sin((2 * pi) * k * t ), k, 1, 10) ;
It returns a 1x360 sym variable, but I don't know how to plot it.
3 Commenti
Walter Roberson
il 1 Mar 2018
Z = double(z);
plot(t, Z)
Your MATLAB is detecting that the input is sym and is doing the double() on your behalf, but you can make what you are doing more obvious by doing the double() yourself.
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Abraham Boayue
il 2 Mar 2018
clear variables
close all
M = 250; % The length of each function
A=3;
t = -2:4/(M-1):2;
y = zeros(1,M); % Initiallize the sum to zero
N = 100;
for k = 1:N
ck = 1/k;
y = y+ A*ck*sin(pi*k*t); % computing the sum
end
plot(t,y,'linewidth',2,'color','m')
a= title('y(t) : sum of sine wave');
set(a,'fontsize',14);
a= xlabel('x [-2\pi 2\pi]');
set(a,'fontsize',20);
a = ylabel('y');
set(a,'fontsize',20);
a = zlabel('z');
set(a,'fontsize',20);
grid;
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