Decimate signal that contains NANs

Hi

How could I decimate signal that contains NAN values?

Answer 1

[Ajay Pattassery]

I understand you want to decimate signals that contain NaN.

I assume you would like to decimate a signal by a factor r if it contains NaN values.

I have removed the NaN values from the signal and then decimate it as follows.

x is assumed as the signal.

positionNaN = isnan(x);
x(positionNaN) = [];
y = decimate(x,r) ;

Here positionNaN is a logical array of the same size as x containing 1 whenever a NaN value is present otherwise zero.

Answer 2

[Sina Salehi]

Hi Ajay

My signal is time seriese and I need to keep the position of each values including NANs. So I can not easily removing NANs.

Thanks,

[Ajay Pattassery]

You could make the signal zero whenever NaN appears. There by keeping the position.

x(positionNaN) = 0;

Answer 3

[Sina Salehi]

Can't replace NAN data with any arbitary values. They have to be NAN after decimate either.