Alternative Methods for Interpolation or Solutions of Interpolation Errors

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Volkan Yangin 2015-12-6

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评论： John D'Errico 2015-12-7

Hi everbody.

Sometimes i give an error when making interpolation process for ex. "The values of X should be distinct error".

I have an exam this tuesday which will be done by matlab. And i am afraid of interpolation errors.

What are the alternative methods for interpolation or solutions of errors like "The values of X should be distinct" etc.?

Thanks a lot.

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Answer 1

Walter Roberson 2015-12-7

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在 MATLAB Online 中打开

The available techniques depend a great deal upon whether the Y corresponding to the duplicate X are the same or different.

If the Y values are the same then the major technique is to unique() the X values and take the corresponding Y values. One way of doing that is to use

XY = [X(:), Y(:)];
uXY = unique(XY,'rows');
uX = uXY(:,1);
uY = uXY(:,2);
interp1(uX, uY, locations_to_interpolate_at)

But typically one would instead construct the X values to be unique.

What are some circumstances under which you have had difficulty with duplicate X values?

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Answer 2

Volkan Yangin 2015-12-7

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Thanks Walter Roberson for your answer.

For ex. my X values = [8.79 9.42 10.05 ...], these values are increasing but through to 900. column, X values decreasing to 0. My Y values haven't got standart tendency, for ex. [970 971 2394 972 ...]. When i use the interp1 command for ex. interp1(X,Y,25.45) etc, i encounter this error. I have some duplicate values of X but not Y.