How to interpolate between values in columns of an array without a for loop

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Bruce Elliott 2023-1-11

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https://ww2.mathworks.cn/matlabcentral/answers/1892370-how-to-interpolate-between-values-in-columns-of-an-array-without-a-for-loop

编辑： Matt J 2023-1-11

I have an n-by-1 vector of x values and an n-by-m array of y values. I would like to get m interpolated y values for an arbitrary value in the range of the given x vector.

Can this be done as an array operation? It feels wrong to use a for-loop in Matlab to step through the columns of an array.

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Bruce Elliott 2023-1-11

Never mind!! The y values can be a matrix or an array - my mistake!

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Answer 1

Matt J 2023-1-11

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https://ww2.mathworks.cn/matlabcentral/answers/1892370-how-to-interpolate-between-values-in-columns-of-an-array-without-a-for-loop#answer_1146615

编辑：Matt J 2023-1-11

在 MATLAB Online 中打开

You should use interp1. It's very straightforward.

[m,n]=deal(8,5);
x=(1:n)';
y=reshape(1:m*n,n,m)
y = 5×8
     1     6    11    16    21    26    31    36
     2     7    12    17    22    27    32    37
     3     8    13    18    23    28    33    38
     4     9    14    19    24    29    34    39
     5    10    15    20    25    30    35    40
yq=interp1(x,y,[1.5;2.5;3.5])
yq = 3×8
    1.5000    6.5000   11.5000   16.5000   21.5000   26.5000   31.5000   36.5000
    2.5000    7.5000   12.5000   17.5000   22.5000   27.5000   32.5000   37.5000
    3.5000    8.5000   13.5000   18.5000   23.5000   28.5000   33.5000   38.5000