필터 지우기
필터 지우기

Finding a significant difference between two datasets

조회 수: 20 (최근 30일)
Harry
Harry 2017년 3월 10일
댓글: Harry 2017년 3월 11일
Hi,
I would like to find spikes in a dataset that are significantly different from a second dataset.
The picture attached shows two datasets and I would like to find the spike at 255 on the x-axis.
It would be helpful if I find these significant spikes automatically with a few commands.
I think it could be possible that I have to apply a tolerance or something that says only find data that has a greater difference than such and such (depending on the datasets that I compare).
So far I only could find the overall maximum y-value and its location but that's not what I want to find.
The output should be something like:
y = [max difference between two data sets]
x = [value at which significant difference occurs]

채택된 답변

John Chilleri
John Chilleri 2017년 3월 10일
편집: John Chilleri 2017년 3월 10일
Hello,
Given data vectors a and b of equal length, you can use the following (assuming your x values are the default 1,2,...):
x = 1:length(a);
y = abs(b-a);
[y, ind] = sort(y,'descend');
x = x(ind);
Now the vector y contains the differences sorted from largest to smallest, and the x vector contains the corresponding x values.
Hope this helps!

추가 답변 (1개)

Steven Lord
Steven Lord 2017년 3월 10일
If you're using release R2017a take a look at the isoutlier function.

카테고리

Help CenterFile Exchange에서 Electrophysiology에 대해 자세히 알아보기

Community Treasure Hunt

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

Start Hunting!

Translated by