How to get exact position (red point)?

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Vic
Vic 2014-11-25
评论： Orion 2014-11-25
Please see the attached file. It is a time series plotted from a very long row vector (1x10000), and I want to locate the position (red point) where a "large" fluctuation occurs. Any MATLAB function or simple way to do it? Thanks.

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回答（1 个）

Orion
Orion 2014-11-25
If you know the "time zone" where you have this minimum, just use min on this interval.
something like :
[Value,Index] = min(YourTimeSeriesValues(2500:4500));
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Vic
Vic 2014-11-25
and red points may be max or min...
Orion
Orion 2014-11-25
Then you're gonna need to analyse the entire vectors.
see extrema, you'll get all the locals min and max.
But then, it's up to you to treat them the way you need it.

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