## Interpolation of matrices corresponding to time vector

### Ashok Das (view profile)

on 25 Jun 2019
Latest activity Commented on by KALYAN ACHARJYA

on 26 Jun 2019

### Andrei Bobrov (view profile)

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?

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Ashok Das

### Ashok Das (view profile)

on 25 Jun 2019
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].
infinity

### infinity (view profile)

on 26 Jun 2019
Hello,
You could try to look at this
maybe it will help.
Bjorn Gustavsson

### Bjorn Gustavsson (view profile)

on 26 Jun 2019
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

### Andrei Bobrov (view profile)

on 26 Jun 2019

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);

Ashok Das

### Ashok Das (view profile)

on 26 Jun 2019
Thank you for yor reply. Can you please elaborate the code a bit. It will be reallly helpfull.
KALYAN ACHARJYA

on 26 Jun 2019