How to use anonymous function in linkage ?

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RuiQi 2017-1-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320710-how-to-use-anonymous-function-in-linkage

评论： Walter Roberson 2017-1-18

I am trying to use my own function in linkage. https://www.mathworks.com/help/stats/linkage.html

I completely have no idea and this tutorial https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html does not help at all because the anonymous function in linkage has no inputs.

This is my code currently based on

test = linkage(array,'single','@custom');

This is how my custom distance is defined

function distance = custom(data_a, data_b)
   distance = abs(data_a(1) - data_b(1)) + abs(data_a(2) - data_b(2))
end

can someone give me a good example of how I can call a @custom without any arguments ?

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回答（1 个）

Walter Roberson 2017-1-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320710-how-to-use-anonymous-function-in-linkage#answer_250867

在 MATLAB Online 中打开

test = linkage(array,'single', @custom);

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RuiQi 2017-1-18

编辑：RuiQi 2017-1-18

在 MATLAB Online 中打开

If i have the function in the same .m file then

Z = linkage(array, 'single', @custom);

gives me the error

Error using linkage (line 128)
Third input must be a string or a cell array.

and

Z = linkage(array, 'single', '@custom');

says

Error using pdist (line 349)
The distance function 'custom' was not found.
Error in linkage (line 247)
           Z = linkagemex(Y,method,pdistArg, memEff);