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

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?

Answer 1

[Star Strider]

Why not just —

K = dot(x1,x2)

instead?

See the documentation on the dot function for details.

[federico nutarelli]

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]

Thank you!