Lagrange polynomial: two equivalent m-files

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Jan 2022-12-23

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https://ww2.mathworks.cn/matlabcentral/answers/1883782-lagrange-polynomial-two-equivalent-m-files

评论： Jan 2022-12-23

I have a problem with the Lagrange polynomial in Matlab.

Here they write

% YY = LAGRANGEPOLY(X,Y,XX) returns the values of the polynomial

% sampled at the points specified in XX -- the same as

% YY = POLYVAL(LAGRANGEPOLY(X,Y)).

I understand that XX are the points at which the Lagrange polynomial is evaluated. But the the command after the second YY doesn't contain XX. So why these two YY are the same ? How can they be the same ??

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Torsten 2022-12-23

编辑：Torsten 2022-12-23

lagrangepoly.m is saved in your working directory ?

Jan 2022-12-23

I see. Now it works fine. I'm new to Matlab thus appologizing my confusion.Thank you.

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回答（1 个）

the cyclist 2022-12-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1883782-lagrange-polynomial-two-equivalent-m-files#answer_1135167

Assuming you are talking about this submission to the FEX, it is not from Mathworks. It is a user-contributed function. I guess you'd need to ask the author what they meant.