How can I use interp1 to interpolate the last row of a matrix?

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Shreshtha Chaturvedi
回答： Voss 2022-12-17
I have the following 4 x 3 matrix:
A = [1,2,3;4,5,6;7,8,9;10,11,12]
I want to interpolate the rows of this matrix and get a 5 x 3 matrix to just get a single, last interpolated row. I am not sure how to use interp1 to this end. Can someone please help? Thank you!

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Voss
Voss 2022-12-17
Ran in:
Here's my guess at what you mean:
A = [1,2,3;4,5,6;7,8,9;10,11,12]
A = 4×3
1 2 3 4 5 6 7 8 9 10 11 12
N = size(A,1);
A(N+1,:) = interp1(1:N,A,N+1,'linear','extrap')
A = 5×3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

更多回答（1 个）

Bora Eryilmaz
Bora Eryilmaz 2022-12-17
编辑：Bora Eryilmaz 2022-12-17
Ran in:
Interpolation is probably not the right term here since interpolation, typically, requires a set of (x,y) data and a different set of x values to use for finding interpolated y values.
A simple approach could be to use the column means of the A matrix to find the row of average values:
A = [1,2,3;4,5,6;7,8,9;10,11,12]
A = 4×3
1 2 3 4 5 6 7 8 9 10 11 12
A(end+1,:) = mean(A)
A = 5×3
1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 9.0000 10.0000 11.0000 12.0000 5.5000 6.5000 7.5000

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