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Problem obtaining minimum negative value in an array

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Omprakash B
Omprakash B 2021-9-15
评论： Chunru 2021-9-17
I have written a code to plot the Damped sine wave and to mark a minimum value on the curve.
function m = plot_cos(t, y)
plot(y,t,'b--')
hold on
[m,~] = min(y)
plot(m,'*r')
hold off
end
Input arguments passed:
t = linspace(0,15,400);
y = exp(-0.5*t).*cos(2*pi.*t);
Issue: Not able to plot the minimum value of y. Am I erring in line no. 4??
  2 个评论
Adam Danz
Adam Danz 2021-9-15
Ran in:
No error in R2021a.
Any time you're asking about an error, please provide the entire copy-pased error message.
t = linspace(0,15,400);
y = exp(-0.5*t).*cos(2*pi.*t);
m = plot_cos(t, y)
m = -0.7812
function m = plot_cos(t, y)
plot(y,t,'b--')
hold on
[m,~] = min(y);
plot(m,'*r')
hold off
end
Omprakash B
Omprakash B 2021-9-16
Yes sure. And i was erring at Line no.4. Now I have understood. Thanks.

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采纳的回答

Chunru
Chunru 2021-9-16
Ran in:
t = linspace(0,15,400);
y = exp(-0.5*t).*cos(2*pi.*t);
plot_cos(t, y)
m = -0.7812
i = 14
ans = -0.7812
% plot t-y or y-t?
function m = plot_cos(t, y)
plot(y,t,'b--')
hold on
[m, i] = min(y) % need to get the location of min
plot(m, t(i),'*r') % plot the min point
hold off
end
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2021-9-16
@Omprakash B, please click the "Accept this answer" link to award @Chunru his reputation points and to let everyone else know it's solved. Thanks in advance.
Chunru
Chunru 2021-9-17
@Image Analyst Thanks for the kind reminder above. I observed that about 30-40% questioners tend to "forget" click "Accept this anser".

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