How to declare kfun function in svmtrain

Question

Ikra89 2013-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/78904-how-to-declare-kfun-function-in-svmtrain

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Hi all

i want to train data using polynomial kernel which have:

gamma, C, r, d.

svmtrain only has boxConstraint (C) and Polyorder (d)

so i have to declare function by my self using @kfun

i've tried many times but still got "*Function definitions are not permitted in this context.*"

where i must put this code?

function K = kfun(U,V,gamma,r)
K = gamma*(U*V')+r;

in command line and in .m script file I still got error like that

anybody can help me?

thanks before

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Ahmed 2013-6-13

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You are probably trying to define a function in a script file. This is not possible. Put your function in a separate m-File called kfun.m or define an anonymous function.

kfun = @(U,V,gamma,r) gamma*(U*V')+r;

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Answer 1

Ahmed 2013-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/78904-how-to-declare-kfun-function-in-svmtrain#answer_90980

编辑：Ahmed 2013-7-6

在 MATLAB Online 中打开

data = randn(100,10);
groups = rand(100,1)>0.5;
g = 1;
r = 1;
  svmstruct = svmtrain(data, groups, ...
'Kernel_Function',@(U,V) g*(U*V')+r,'BoxConstraint', 0.2);

(note that 'gamma' is pre-defined function, therefore you should better use another variable name)