Undefined function 'geomean' for input arguments of type 'double' in Matlab 2020

The geomean function is part of Statistics and Machine Learning Toolbox. Do you have this toolbox installed and licensed? You can check this by running the ver command and looking for a line starting with "Statistics and Machine Learning Toolbox" in the displayed output.

If that line does not exist you will need to install Statistics and Machine Learning Toolbox to use this function.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

更多回答（2 个）

Star Strider 2023-3-4

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1923055-undefined-function-geomean-for-input-arguments-of-type-double-in-matlab-2020#answer_1185210

在 MATLAB Online 中打开

An alternative is:

gm = @(x) prod(x)^(1/numel(x));
x = rand(1,100);
y1 = geomean(x)
y1 = 0.3765
y2 = gm(x)
y2 = 0.3765

11 个评论
显示 9更早的评论隐藏 9更早的评论

Star Strider 2023-3-5

I do not understand what you are doing.

Numeric functions will not usually work on non-numeric (such as string) data. These will not, because they are not designed to. I doubt that geomean is, either.

If you are getting the ‘Undefined function’ error, that means that ‘gm’ was not in your code before you called it. It is an anonymous function, so it must be close to the beginning of your code in order to use it later. It is not like a function file.

Walter Roberson 2023-3-5

The anonymous function gm is not designed to be a complete drop-in replacement for all functionality of geomean. Star Strider and I made no attempt to handle omitnan or the dimension arguments, and did not pay attention to calculations on matrices.

We also were not telling you that gm or gmL were already available in your version of MATLAB: we were providing a quick fix.

If you need more functionality then you should define your own gm.m using the mathematical logic we show, but perhaps looping over each column removing nan values before doing the calculation.

请先登录，再进行评论。