How can i plot peaks?

m c
2013 4 24
4 个回答
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Hi, first off all i want to excuse me if a post wrong. I'm new on mathworks and i've got a big problem.I want to make a GUI in matlab with axes and i don't know how to put on graphic the values of the maximum and minimum peaks. A bit of program look like this:
S=0.275
t=0:0.1:6;
n=10/64;
omega=(2*pi*n)
d=S*(1-cos(omega*t))/2
plot(handles.axes1,omega*t,d)
What i want is to show me on the axes the maximum and minimum values for "d" whatever values i've got to put on S,t,omega etc. Hope you can help me. Thx alot and excuse me for english issues.

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m c
m c 2013-4-24
编辑：m c 2013-4-24

0 个投票

Thank you very much, but now is show me only de maximum circle...It's a start, but i want to show on the graphic the value also...Thx again!
Please acces the link to see the graphic!
http://postimg.org/image/64nfixurf/
and, i think, it's show's me only one of two circle(max or min), not all in same time

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Mahdi
Mahdi 2013-4-24
编辑：Mahdi 2013-4-24
Please respond as a comment to my answer.
Use the hold on function, so
hold on
MaxValue=max(d);
...
% To show the actual value
text(omega.*t(IndexMaxValue), MaxValue, num2str(MaxValue))
m c
m c 2013-4-24
It's work, but i have two more problems:i need to push the button 4-5 times to show me the entire graphic, at first click it's show me only the max circle....and the secont problem is to align the value on the graphic(i've got 3 diferent axes and for all it show's me the values on the middle one).Thank you very much!
m c
m c 2013-4-24
编辑：m c 2013-4-25
I think i need to write something different at other's two axes because it's show's all values on one graphic .. but i don't see were to modify!
http://postimg.org/image/lu32fh31t/

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更多回答（3 个）

Mahdi
Mahdi 2013-4-24

0 个投票

MaxValue=max(d);
IndexMaxValue=find(d==MaxValue)
% Creates a red circle where the max is.
plot(handles.axes1, omega.*t(IndexMaxValue), MaxValue, 'ro')
You can follow the same logic for the min value, just use min(d) instead.
m c
m c 2013-4-27
编辑：m c 2013-4-27

0 个投票

Anybody can help me ? I need help!Please! I need to write something on the text code because it show's me all values on the last axes.I find on your site something with parent function but i don't know how to use it.
http://postimg.org/image/lu32fh31t/

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