Find average of multiples lines

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Vince Clementi
Vince Clementi 2018-2-1
评论： Marcus Leiwe 2020-3-27
Hi All,
Having more trouble than I should finding the average line from 7 records. Each record is basically [T, (a-b)], where T is a common time interval (0:0.1:30) and (a-b) is the difference between two data sets (a-b, a-c, a-d, etc.).
I've designated each "difference" as such: diff, diff2, diff3, diff4, diff5, diff6, diff7. I am easily able to plot all of these records on the same plot. However, each method to find the mean of these lines fails. SO far, I have used mean([diff diff2, etc.],7). How do I go about finding the average for each common time point and then plot that?
Thanks.
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Bob Thompson
Bob Thompson 2018-2-1
Let me know if it works, and I can post as an official answer, or if you have some trouble shooting you can post your own answer.

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Greg
Greg 2018-2-1
Regarding the follow-up question found in the comments (NaN affecting the mean):
Use the 'omitnan' flag of the mean function (R2015a and newer):
%%%I wouldn't use "diff" as a variable name - it's a function
avg = mean([diff1, diff2, diff3, diff4, diff5, diff6, diff7],2,'omitnan');
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Bob Thompson
Bob Thompson 2018-2-1
That's pretty good, definitely gets rid of having to do a manual check.
Marcus Leiwe
Marcus Leiwe 2020-3-27
I think there is a function called nanmean that will do the same too

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