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# Interpolation of matrices corresponding to time vector

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Ashok Das 2019 年 6 月 25 日
コメント済み: KALYAN ACHARJYA 2019 年 6 月 26 日
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?

#### 4 件のコメント

Ashok Das 2019 年 6 月 25 日
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 2019 年 6 月 26 日
Hello,
You could try to look at this
maybe it will help.
Bjorn Gustavsson 2019 年 6 月 26 日
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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### 採用された回答

Andrei Bobrov 2019 年 6 月 26 日
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);

#### 2 件のコメント

Ashok Das 2019 年 6 月 26 日
Thank you for yor reply. Can you please elaborate the code a bit. It will be reallly helpfull.
KALYAN ACHARJYA 2019 年 6 月 26 日
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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### その他の回答 (1 件)

Vismay Raj 2019 年 6 月 26 日

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