analyze Consecutive points in an array

Question

ALDO 2019-5-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464495-analyze-consecutive-points-in-an-array

编辑： ALDO 2019-5-31

I have an array with following values. I would like to look at 5 consecutive points and see if they meet the following critria and return an logical array. if the criteria is met we get 1 and if not 0.

Data values example:

x=0.045135 -0.03538 0.010979 -0.01464 0.050014 0.563576 1.471152 1.451634 (the actual array is has 20000 elemets).

Criteria:

The point I am looking at is Pi, I would like it to meet thsese citeria Pi>=0.2 P(i+1)>=0.2 P(i+2)>=0.2 P(i-1)<0.2 P(i-2)<0.2

Thank you for your help!

for i=1:lenght(x)

if x(i)>=0.2 && x(i+1)>=0.2 && x(i+2)>=0.2 && x(i-1)<0.2 && x(i-2)<0.2

w(i)=1

else

w(i)=0

end

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Answer 1

Jos (10584) 2019-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/464495-analyze-consecutive-points-in-an-array#answer_376973

编辑：Jos (10584) 2019-5-29

在 MATLAB Online 中打开

Let x be your vector.

MyFun = @(i) x(i)>=0.2 && x(i+1)>=0.2 && x(i+2)>=0.2 && x(i-1)<0.2 && x(i-2)<0.2
% MyFun(k) will return true or false by looking at the 5 points surrounding point k
RESULT = false(size(x)) 
ix = 3:numel(x)-2 % skip first and last elements (default to false)
RESULT(ix) = MyFun(ix)