how to do interpolation?

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Lilya
Lilya 2016-7-28
评论： Lilya 2016-7-29
Hi all,
I worked with the time series of the sea level data (non-tidal residual. thus, there is no periodicity in the time series. could you please help me to do interpolation because it contains some NaN values.
Thank you in advance.

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Kelly Kearney
Kelly Kearney 2016-7-28
A little more explanation of what you're trying to do is needed here. Are you trying to interpolate from scattered data to a regular grid? If so, your best option is probably to drop the NANs prior to interpolation. Or do you want to fill in some of the missing spots in an already-gridded dataset? Or something else?
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Kelly Kearney
Kelly Kearney 2016-7-29
Again, can you give a little more detail? Just saying "it doesn't work" doesn't help us, since inpaint_nans should be exactly what you need:
% Some fake data with missing points
x = 1:100;
y = sin(x/pi);
y(rand(100,1)> 0.8) = NaN;
% Fill the NaNs
y2 = inpaint_nans(y);
% Plot
plot(x, y, '-x', x, y2, ':')
Lilya
Lilya 2016-7-29
THANKX a lot.

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