Hallo Mathishard,
\(\vec{x}\) = \(\begin{pmatrix} x_1 \\ x_2 \end{pmatrix}\)
\(\vec{y}\) = 1/√2 • \(\begin{pmatrix} 1&-1\\ 1&1\end{pmatrix}\) • \(\begin{pmatrix} x_1 \\ x_2 \end{pmatrix}\) = \(\begin{pmatrix} 1/√2 · (x_1-x_2) \\ 1/√2 · (x_1+x_2) \end{pmatrix}\)
Gruß Wolfgang