Plotting the integral of a graph

201 次查看（过去 30 天）
Hans123
Hans123 2019-12-4
评论： Fabio Freschi 2019-12-4
Hi,
I have a graph of a waveform that I want to find the integral plot of this waveform (shown below). Could this be done on MATLAB or is this something for Simulink. I am new to Simulink, and I would appreciate any help on graphing the integral plot.

请先登录，再回答此问题。

采纳的回答

Fabio Freschi
Fabio Freschi 2019-12-4
Suppose that x and y are the vectors defining your waveform.
% dummy values
x = linspace(0,2*pi,1000);
y = sin(x);
% integral
Y = cumtrapz(x,y);
% plot
figure, hold on
plot(x,y); % waveform
plot(x,Y); % integral
legend('waveform','integral')
  2 个评论
Hans123
Hans123 2019-12-4
thank you Fabio! I just want to verify the plot I got is the integral - what would be the code to derive Y so I could plot it and verify it is the same as the initial plot.
Fabio Freschi
Fabio Freschi 2019-12-4
My pleasure! The derivative can be obtained with diff function.
yd = diff(Y)./diff(x);
% yd has one point less, so we must calculate an ad-hoc x vector
xd = (x(1:end-1)+x(2:end))/2;
% plot
plot(xd,yd);
It this solves your original question, please accept it!
F

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Simulink 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by