MATLAB Answers

analyze Consecutive points in an array

2 views (last 30 days)
ALDO
ALDO on 28 May 2019
Edited: ALDO on 31 May 2019
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

Accepted Answer

Jos (10584)
Jos (10584) on 28 May 2019
Edited: Jos (10584) on 29 May 2019
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)
  1 Comment
ALDO
ALDO on 31 May 2019
Thank you for your answer! It worked perfectly!

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!