How to use anonymous function in linkage ?

2017 1 17
1 个回答
更新时间：2017 1 18
5 次查看（30 天）

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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
Walter Roberson 2017-1-17

0 个投票

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

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RuiQi
RuiQi 2017-1-18
I am getting an error
Error using linkage (line 128)
Third input must be a string or a cell array.
My array is 100 x 5 double. My custom distance function is in a custom.m file in the same directory.
Z = linkage(array, 'single', @custom);
function distance = custom(data_a, data_b)
w1 = abs(data_a(1) - data_b(1)) + abs(data_a(2) - data_b(2)) + abs(data_a(3) - data_b(3)) + abs(data_a(5) - data_b(5));
distance = w1 * w1 / (1/data_a(4) + 1/data_b(4));
end
RuiQi
RuiQi 2017-1-18
I think
Z = linkage(array, 'single', '@custom');
with the apostrophe worked.
RuiQi
RuiQi 2017-1-18
编辑：RuiQi 2017-1-18
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);
Walter Roberson
Walter Roberson 2017-1-18
Which MATLAB release are you using? The ability to use custom functions is not documented up to R2010b, but is documented starting with R2011a.

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