# Two signals with different x-values. Mean(..)

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Christoph Thale on 12 Sep 2016
Answered: dpb on 12 Sep 2016
Hi,
I got two different signals with a lot of x- and y-values. I am able to plot them both but i have no clue to get the mean of the signals.
The signals are build like that:
x1 ......... y1 ---------------------- x2 .......y2
0,12 ....... 2,1 ------------------- 0,133 .... 2,1
0,15 ........2,62 ------------------ 0,143 .... 2,45
.
.
.
so I cant take y1(1) and y2(1) and cut them in two. Also, i am not able to use polyfit or something like that, because there is no polynom which can discribe the course.
Does anyone have an idea?
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Christoph Thale on 12 Sep 2016
i got two signals and i want to have the mean-signal of both.

dpb on 12 Sep 2016
If you can plot them, then I presume you have them as variables. Since the x-values appear to be nonconformant in magnitude, about all you can do is to interpolate each to a common set of points and then average the resulting y values at those values. Perhaps the simplest is to use one of the two as the interpolating value...
y1Interp=interp1(x1,y1,x2,'linear','extrap'); % get interpolated y1 at points in x2
y=mean([y1Interp y2]); % and average the two
hold all % to add to the previous plot of each separately
plot(x2,y) % plot the averaged value at the point it was interpolated to match