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

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Shreshtha Chaturvedi 2022-12-17

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回答： Voss 2022-12-17

采纳的回答： Voss

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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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Answer 1

Voss 2022-12-17

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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

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Answer 2

Bora Eryilmaz 2022-12-17

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编辑：Bora Eryilmaz 2022-12-17

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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