Plot(x,y2) with if condition y1(x)

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Kacper Wybranski
Kacper Wybranski 2020-3-26
评论： Kacper Wybranski 2020-3-26
Hello i've got stuck with some code.
What i want to get is this shape of two functions:
I know y function and how to draw it but i've got problem with y^2 function and its domain.
Here's my code
clc
clear all
close all
dt=0.01;
t=[0:dt:4*pi];
w=1;
A=2;
y1=A.*cos(t).*(sin(2.*w.*t)).^2;
y2=y1.^2
plot(t,y1,'r')
hold on
xlabel('time')
ylabel('Amplitude')
grid on
if y1>0
plot(t,y2,'og')
end
Sadly, i get only visual of y1 not y2 :(
What should I do using if statement or some other loops?
  2 个评论
Adam Danz
Adam Danz 2020-3-26
编辑：Adam Danz 2020-3-26
"I know y function and how to draw it but i've got problem with y^2 function"
What's the problem and what's the goal? Is the green line supposed to be connected with peaks in between?
Kacper Wybranski
Kacper Wybranski 2020-3-26
The y^2 function was supposed to appear only when y function has values over 0, the answer from Fangjun Jiang helped.

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2020-3-26
You can check the output of y1>0. It's a vector so shouldn't be used in if statement.
what you need for y2 is
index=y1>0
plot(t(index),y2(index),'og')

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