How can I calculate the standard deviation for a part of "all data"?

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Max Behr
Max Behr 2020년 6월 1일
댓글: Max Behr 2020년 6월 2일
Hello,
I have a two different matrices:
time=[0,0.5,2,4,6]
time =
0 0.5000 2.0000 4.0000 6.0000
data=[1,3,5,3,6]
data =
1 3 5 3 6
Now I would like to do a specific operation only if time>=0 & =< 4. So in this case only for the first four values of data.
For example these kind of operations:
sqrt(mean((diff(data).*diff(data))))
std(a)
How can I do the calculation only for a specific period of time?
Thanks for your help!

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Image Analyst
Image Analyst 2020년 6월 1일
I have no idea what "a" is. But is this something like you were looking for?
timeVec = [0,0.5,2,4,6] % Don't use "time" since it's a built-in function.
data=[1,3,5,3,6]
indexes = timeVec >= 0 & timeVec <= 4
dataToUse = data(indexes)
% Now do your operation:
result = sqrt(mean((diff(dataToUse) .* diff(dataToUse))))
result2 = std(result) % No idea what a is. Is it the result of the sqrt() operation?
  댓글 수: 3
Max Behr
Max Behr 2020년 6월 2일
Thanks, wasn't sure if it works :)

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