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

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Christoph Thale 2016-9-12

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回答： dpb 2016-9-12

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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John D'Errico 2016-9-12

Hopelessly confusing question. Please explain what you need. CLEARLY. Give an example if possible.

Christoph Thale 2016-9-12

i got two signals and i want to have the mean-signal of both.

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Answer 1

dpb 2016-9-12

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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