analyze Consecutive points in an array

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ALDO
ALDO 2019-5-28
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
end

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采纳的回答

Jos (10584)
Jos (10584) 2019-5-28
编辑：Jos (10584) 2019-5-29
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)

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