Find the increasing and decreasing point in array?

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Sabarinathan Vadivelu
评论： Image Analyst 2014-2-20
I have an array. Which is increasing. At one point it starts decreases.
This trend starts repeating many times in array. How to find that point in array where the trend starts?
  1 个评论
Image Analyst
Image Analyst 2014-2-20
Define "trend". Is it the start of the first increasing part of a signal where you have many rising/falling sections? Maybe you can post a screenshot of your data plotted and point out the element that you say the "trend" starts at.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-2-20
编辑：Azzi Abdelmalek 2014-2-20
A=[1 2 3 2 1 4 5 6 7 5 2 0 4 5 6 10]
[peaks,idx]=findpeaks(A)
If you haven't a signal processing toolbox
A=[5 2 3 2 1 4 5 6 7 5 2 0 4 5 6 10]
d=sign([0 diff(A)]);
idx=strfind(d,[1,-1])

更多回答（1 个）

Image Analyst
Image Analyst 2014-2-20
Use the diff() function
differences = diff(yourArray);
increasing values will be positive and decreasing values will be negative.

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