Function knnsearch triggers an error in MATLAB R2021a, which wasn't in R2013b

Question

Iyad Khuder 2022-1-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622935-function-knnsearch-triggers-an-error-in-matlab-r2021a-which-wasn-t-in-r2013b

编辑： Iyad Khuder 2022-1-5

I had a project (related to my PhD research), which was running properly in MATLAB R2013b. Having migrated to v R2021a, I've got an error, triggering from the function knnsearch:

Undefined function 'knnsearch' for input arguments of type 'double'.

at thos code line:

[layer_mIdx, mD] = knnsearch(Vec_layer_Centroids, Vec_layer_Centroids, 'K', K+1, 'Distance', 'minkowski', 'P', 2);

The syntax of the function is: Idx = knnsearch(X,Y,Name,Value)

where X and Y are Input data, specified as a numeric matrix.

In my usecase, X=Y and is an array of doubles, as shown in my workplace:

This array contains the coordinates of a set of 2-D points, which I called "centroids".

Although, I have extracted these coordinates from a culumn of type "cell array", but I think they are extracted as numeric date (as MATLAB recognizes them as doubles in the workspace).

Furthermore, the function worked without any problem in v R2013b, which is frustrating:(

Any help would be appreciated.

Let me know if any further details could help.

Thanks

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Answer 1

Walter Roberson 2022-1-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622935-function-knnsearch-triggers-an-error-in-matlab-r2021a-which-wasn-t-in-r2013b#answer_868710

在 MATLAB Online 中打开

load hospital;
X = [hospital.Age hospital.Weight];
Y = [20 162; 30 169; 40 168; 50 170; 60 171];   % New patients
Idx = knnsearch(X,Y)
Idx = 5×1
    96
    96
    41
    51
    20

So knnsearch() still works in R2021b.

However... it is part of the Statistics Toolbox, and perhaps you did not install / license that toolbox when you upgraded.

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Walter Roberson 2022-1-5

You can use that "Get Add-Ons" to install the toolbox.

Iyad Khuder 2022-1-5

编辑：Iyad Khuder 2022-1-5

Yeeh it works! ^_^

P.S. I first hadn't seen your 2nd comment on how to add the add-on and didn't notice that button :))

I asked Google, and this lead me to install Mathwork products, using its installer... and in the end it wasn't actually added. Then, I saw your hint, and I clicked that "Get Add-Ons" button, and it worked.

Appreciated!

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