interp1 measurements drifting

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Nikolaos Zafirakis
Nikolaos Zafirakis on 24 Jul 2019
Answered: Bhargavi Maganuru on 22 Aug 2019
I have some original data plotted below and I need to interpolate it with my other set of measurements. However whenever I run my interpolation function the initial measurements start at an unreal value. Both sets of data are different lengths.
Original Data
(y is Data, x is just number of measurements)
SS = (:,1:5)
SS1 = SS(:,4) % Time reference
SS2 = SS(:,1) % Data
K = interp1( SS1(1:end,1) , SS2(1:end,1) , RefernceTime(1:end,1),'pchip');
Interpolated data
(y is interpolated data and x is the reference times)
  3 Comments
Bhargavi Maganuru
Bhargavi Maganuru on 20 Aug 2019
Can you attach SS and RefernceTime data files

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Answers (1)

Bhargavi Maganuru
Bhargavi Maganuru on 22 Aug 2019
As you mentioned SS1 and SS2 are arrays of 32 columns, but in the line
K = interp1(SS1(1: end,1), SS2(1: end,1), RefernceTime (1: end,1),'pchip');
it is taking only one column of SS1 and SS2. You can directly use SS1, SS2 and ReferenceTime.
K = interp1(SS1, SS2, RefernceTime, 'pchip');
You can look at following code to interpolate array with 32 columns:
%random data
ss2=rand (1,32);
ss1= (1:32)
ReferenceTime=ss1
k=interp1(ss1, ss2, ReferenceTime, 'pchip')
plot (ss1, ss2,'o', ReferenceTime, k, ':.');
Refer to the following link for more information about “interp1” function:

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