# Find average of multiples lines

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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.

##### 7 Comments

Bob Thompson
on 1 Feb 2018

### Accepted Answer

Greg
on 1 Feb 2018

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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