Mark the peak of a graph

Question

Brian Hoblin 2016-10-31

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/309901-mark-the-peak-of-a-graph

评论： Brian Hoblin 2016-10-31

采纳的回答： KSSV

I'm trying to place a marker at the peak power value of a graph but I'm having trouble. This is my code,

[Peak, PeakIdx] = findpeaks(Power);

plot (Resistance,Power)

hold on

grid on

ylabel ('Power (mW)')

xlabel ('Resistance (\Omega)')

title ('Power vs Resistance')

text(Resistance(PeakIdx), Peak, sprintf('Peak = %6.3f (mW)', Peak))

I get "Peak=24.900 (mW)" but I'd like there to be some sort of marker at the exact location of the peak on the graph. I've looked around and found a page that should be answering my question but I must be doing something wrong. On the image below I would like there to be a circle (or something) to more clearly indicate that peak power occurred at 1000 ohms. I can put a couple spaces in to move "Peak..." over (' Peak = %6.3f (mW)', Peak). Any suggestions? Thanks in advance.

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Answer 1

KSSV 2016-10-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/309901-mark-the-peak-of-a-graph#answer_241362

在 MATLAB Online 中打开

[Peak, PeakIdx] = findpeaks(Power,Resistance);
findpeaks(power,Resistance)  
hold on  
grid on  
ylabel ('Power (mW)')  
xlabel ('Resistance (\Omega)')  
title ('Power vs Resistance')  
text(Resistance(PeakIdx), Peak, sprintf('Peak = %6.3f (mW)', Peak))

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Brian Hoblin 2016-10-31

This comes really close but my "text..." line causes "Index exceeds matrix dimensions". Any idea on how to correct that?

Brian Hoblin 2016-10-31

Ok. I messed around with both suggestions and I was able to get 2 different versions that both satisfy. Sorry I couldn't accept both because both were very helpful. One utilizes a legend and the one I needed to add a 'hold on' to. Thank you for your assistance.

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