perform interpolation each row of a matrix

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wangm 2023-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/1906006-perform-interpolation-each-row-of-a-matrix

评论： Fangjun Jiang 2023-2-3

i have a matrix A with one million rows, and each row is monotonic increase. the value in each row is x.

The interpolation is perform to obtain one million yi for each row given a constant xi value (xi is the same for each row) and given an array y (y is also the same for each row). is there an efficient way to get yi other than using loop.

right now i have to use loop like this:

for i = 1:1e6

yi(i) = interpi(A(i,:), y, xi);

end

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回答（1 个）

Fangjun Jiang 2023-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/1906006-perform-interpolation-each-row-of-a-matrix#answer_1163215

编辑：Fangjun Jiang 2023-2-3

在 MATLAB Online 中打开

You can use interp1() directly for this without for-loop.

x=1:10;
A=(1:10)'+(1:10);
xi=5;
y=interp1(x,A',xi)
y = 1×10
     6     7     8     9    10    11    12    13    14    15

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wangm 2023-2-3

wait, you did not answer my question. in my question, matrix A is x, but you matrix A is y.

Fangjun Jiang 2023-2-3

I was taking some guesses on your question. Now you need to clarify these. "the value in each row is x", "in my question, matrix A is x", "but you matrix A is y".

The best way is to provide a complete numerical example, including the value for x, xi, y.

You don't need to provide one million rows. Three row is sufficient.

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