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From: Beng on 11 May 2010 22:17
Hi all, I'm new to matlab. Here I have a question on how to plot a graph on all the edge on the signal. Because of my poor engllish, I trying to depict the problem in the figure as linked below.

http://i44.tinypic.com/20folkz.png

The top Plotting with blue region is the original plotting. The blue region is actually formed by high density sine wave. The Zoom A is roughly what we will see when we zoom into the blue region (probably few hundred times bigger) .

My question is, is there any matlab function that allow me to plot a graph like in figure 2 (bottom) RED line. A line just on all the peak points of those repeating sine waves?

I knew i can create a long loop keep tracking on the peak points and record it down, however my instinct tell me that that's gonna be a better way of doing that.

Please any help will much appreciated.

thank you!
From: us on 11 May 2010 22:26
"Beng " <kevin_obl(a)yahoo.com> wrote in message <hsd331$sjv$1(a)fred.mathworks.com>...
> Hi all, I'm new to matlab. Here I have a question on how to plot a graph on all the edge on the signal. Because of my poor engllish, I trying to depict the problem in the figure as linked below.
>
> http://i44.tinypic.com/20folkz.png
>
> The top Plotting with blue region is the original plotting. The blue region is actually formed by high density sine wave. The Zoom A is roughly what we will see when we zoom into the blue region (probably few hundred times bigger) .
>
> My question is, is there any matlab function that allow me to plot a graph like in figure 2 (bottom) RED line. A line just on all the peak points of those repeating sine waves?
>
> I knew i can create a long loop keep tracking on the peak points and record it down, however my instinct tell me that that's gonna be a better way of doing that.
>
> Please any help will much appreciated.
>
> thank you!

a hint:
- try one of the many peak-finders on the FEX site, eg,...

http://www.mathworks.com/matlabcentral/fileexchange/25500-peakfinder

us
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