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

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federico nutarelli
评论： Star Strider 2021-5-5
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
Star Strider 2021-5-5
Why not just —
K = dot(x1,x2)
instead?
See the documentation on the dot function for details.

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