Output argument "K" (and maybe others) not assigned during call to "linear_kernel".

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federico nutarelli 2021-5-5

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评论： Star Strider 2021-5-5

采纳的回答： Star Strider

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Hi all,

the above error apears when I call

K = linear_kernel(tX, tX);

It does not appear if I do not assign linear_kernel(tX,tX).

The function I am referring is:

function K = linear_kernel(x1,x2)
%LINEAR_KERNEL Build a linear kernel.
% Ensure that x1 and x2 are column vectors
x1 = x1(:); 
x2 = x2(:);
% Compute the kernel
K = x1' * x2;  % dot product
end

why does this happen?

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采纳的回答

Star Strider 2021-5-5

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Why not just —

K = dot(x1,x2)

instead?

See the documentation on the dot function for details.

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federico nutarelli 2021-5-5

You are right. I did not know dot that much so I did not feel confident. Anyway issue solved because I changed the working directory

Star Strider 2021-5-5

Thank you!

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