How can I plot the periodic function? please help
显示 更早的评论
how can I plot(t,Tg) or interpret Tg in t=(0:0.001:0.1n),n is a given positive integer ?
I had tried to modify the code in https://www.mathworks.com/matlabcentral/answers/163582-how-to-plot-a-piecewise-periodic-function-please-help
but it didn't work. plz help.
采纳的回答
Walter Roberson
2019-6-6
Tg = 2900 * size(t);
tmod = mod(t, 0.1);
mask = tmod > 0.007;
Tg(mask) = A * exp(-B * tmod(mask));
3 个评论
PIN RUI HUANG
2019-6-7
Torsten
2019-6-7
Replace
Tg = 2900 * size(t);
by
Tg = 2900 * ones(size(t));
PIN RUI HUANG
2019-6-7
更多回答（1 个）
mousa alsaeed
2019-11-25
here is a code for a function that can give you the plot for any periodic function first thing you need to define a variable t as symbolic variable
syms t
second thing define your function
f = log(t)-t
the function needs a period and a specific number of cycles to draw your function in
T = 3; , N = 10;
here is the code for the function :
% done by mousa alsaeed
% email : mousa276alsaeed98@gmail.com
function periodic(fun,period,number_of_cycles)
fp = 0;
syms t
for i=0:number_of_cycles-1
fp = fp + subs(fun,t,(t-i*period))*(heaviside(t-i*period)-heaviside(t-(i+1)*period));
end
fplot(fp,[0 number_of_cycles*period])
grid on
title('the periodic function')
xlabel('t')
set(gca,'XMinorTick','On','YMinorTick','On');
end
here is what you gonna write on the commmand window :
periodic(f,T,N)
and here is the results :
3 个评论
Nabeel Bakr
2020-7-21
编辑：Nabeel Bakr
2020-7-21
Dear Mr. Mousa Alsaeed,
My B.Sc. students are doing their B.Sc. graduation project about Fourier series using Matlab platform.
We came across your nicely written Matlab code which plots any periodic function.
We would be grateful if you kindly send us a modified version of your code so that it can plot the functions starting from the negative side of x-axis (i.e. from -N/2*T to N/2*T).
We plotted the function y=x^2 (T=2) and (N=3) using different procedure. (An image is attached).
But we would like to try your code.
With our best regards.
Stay Safe.
mousa alsaeed
2020-8-4
sorry for the delay
same inputs as before and here is the new code that plots periodic function to be symmetric around the y-axis (i.e. starts from -N/2*T to N/2*T)
% done by mousa alsaeed
% email : mousa276alsaeed98@gmail.com
function periodic(fun,period,number_of_cycles)
fp = 0;
syms t
for i= -number_of_cycles/2 : number_of_cycles/2
fp = fp + subs(fun,t,(t-(2*i+1)*0.5*period))*(heaviside(t-i*period)-heaviside(t-(i+1)*period));
end
fplot(fp,[(-number_of_cycles/2)*period (number_of_cycles/2)*period])
grid on
title('the periodic function')
xlabel('t')
set(gca,'XMinorTick','On','YMinorTick','On');
end
here is the results
Nabeel Bakr
2020-8-5
Thank you very much for your help ... Regards
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