# How to stop plotting after function hits first zero in oscillatory system?

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Robert Flores on 16 May 2019
Commented: Robert Flores on 16 May 2019
Hello everyone,
I am making a Haversine function, and am wanting the function to stop plotting values after the first zero is hit; this zero occures at haversine50(101). I tried making a for loop, however, it did not do anything. If you can help me resolve this issue by making my plot do one cycle and then be zero for the rest of the time values, it will be greatly appreciated, thank you.
-Robert
CODE:
clc,clear,close all
dt = 1e-4;
time = 0:dt:12e-3;
hz = [50 500 1000];
haversine50 = (0.5)*(1-cosd(hz(1)*2*360*time));
zero = find(haversine50 == 0);
endtime50 = haversine50(zero(2));
for i=1:numel(time)
if haversine50(i) >= endtime50
haversine50(i) = (0.5)*(1-cosd(hz(1)*2*360*time(i)));
elseif (haversine50(i) < endtime50)
haversine50(i) = 0;
end
end
figure(1)
plot(time,haversine50); title('Response'); xlabel('Time, measured in sec'); ylabel('Acceleration, measured in m/s^2')

Alex Mcaulley on 16 May 2019
clc,clear,close all
dt = 1e-4;
time = 0:dt:12e-3;
hz = [50 500 1000];
haversine50 = (0.5)*(1-cosd(hz(1)*2*360*time));
zero = find(haversine50 == 0);
haversine50(zero(2)+1:end) = 0;
figure(1)
plot(time,haversine50); title('Response'); xlabel('Time, measured in sec'); ylabel('Acceleration, measured in m/s^2')

#### 1 Comment

Robert Flores on 16 May 2019
Thank you, it works beautifully!
-Robert