determining time interval between peaks using a for loop
显示 更早的评论
i have a set of data for volume flow rate (vfr) and plotted a graph vfr against time. i have to find the time interval between peaks using a for loop but am unsure how to write this loop
采纳的回答
I agree with jonas, a for-loop is unneeded. I also agree that anyone would need a sample dataset to determine the best approach. In the mean time, here's a general approach assuming your data are stored in a vector named vfr.
[~, loc] = findpeaks(vfr);
loc will be an index vector that identifies which values in vfr were identified as peaks.
2) Assuming the data in vfr were sampled at a fixed interval 'intv' (say, every 10 ms), all you need to do is determine the number of values between each peak and multiply that number by the sample interval.
timeBetweenPeaks = diff(loc) * intv;
timeBetweenPeaks is a vector with a length one shorter than loc and is the time between each detected peak.
It's fairly straight forward to turn that into a for-loop but not necessary.
2 个评论
samah khalil
2018-11-15
I'll explain it with words so you can explore some coding which is the best way to learn. But please note that this method is really silly.
loc is a vector of indices such as [10 23 42 99]. That means the 10th , 23rd, etc element of vfr has been identified as a peak. Using a for-loop
for i = __ : __
[your code]
end
you want to loop through the 2nd element of loc to the end of loc. That is, your loops will be 2 to length(loc). Within each loop, you'll need to get the distance between peak i and peak i-1 and you'll need to store the result in a new vector timeBetweenPeaks. The distance is merely (loc(i)-loc(i-1)) * intv.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
