How can i find two certain points of data set?
조회 수: 1 (최근 30일)
이전 댓글 표시
Hello!
I want to find to certain points of a plot. The plot is attached:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/166273/image.jpeg)
The x-axis shows the time, that is the variable timeMsT; the y-axis shows the force, that is saved in the variable chB and i plotted it with:
plot(timeMsT,chB);
I need to find the rising and the falling value of the peak. I already calculated the "initial force": 1194.3592 mV. My "treshold" is about 100mV above the initial force - so ~1300 mV. I need the left and the right value of time (ms), where the force crosses this treshold value - obviously it will be about 40 and 70 ms - to calculate the duration of the impact. I already tried to use the "find"-function, but until now it didn't work.
It would be very thankful for a few ideas. :-)
Kind regards, Georg
댓글 수: 0
채택된 답변
Image Analyst
2016년 6월 10일
Try this:
threshold = initialForce + 100;
firstIndex = find(chB > threshold, 1, 'first');
lastIndex = find(chB > threshold, 1, 'last');
firstTime = timeMsT(firstIndex);
lastTime = timeMsT(lastIndex);
추가 답변 (0개)
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!