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Interpolation of matrices corresponding to time vector

Asked by Ashok Das on 25 Jun 2019
Latest activity Commented on by KALYAN ACHARJYA on 26 Jun 2019
I have a vector containing time points, and a cell structure containing matrices as its elements.
I want to interpolate the corresponding matrix for some time point which is not in the time vector. How to do that?
Presentation1.png

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Consider t = [1, 2, 3] and corresponding cell is A, where
A{1} = [1 1; 1 1] , A{2} = [1 0.9;0.95 .87] , A{3} = [1.1 0.85;0.91 .8].
Now want to find the corresponding matrices at other time points, say for time t_new = [1.2, 2.1, 2.9].
Hello,
You could try to look at this
maybe it will help.
Or, depending on sizes, it might be more efficient to interpolate all matrix components at the same time with interp3, or interpn. The different interpolation functions have slightly different options when it comes to interpolation methods.
HTH

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2 Answers

Answer by Andrei Bobrov
on 26 Jun 2019
 Accepted Answer

Variant with interp1:
t = [1, 2, 3];
A = {[1, 1; 1, 1] ,[1, 0.9;0.95, .87] , [1.1, 0.85;0.91, .8]};
tt = [1.2, 2.1, 2.9];
out = interp1(t(:),permute(cat(3,A{:}),[3,2,1]),tt);
out = permute(out,3:-1:1);

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Thank you for yor reply. Can you please elaborate the code a bit. It will be reallly helpfull.
The answered is already provided by @Andrei, Hello @Ashok, please accept the answer to give due credit to the answer provider.

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Answer by Vismay Raj on 26 Jun 2019

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