Can anyone prove the following
x'X'y = y'Xx
Where x,y is a column vector and X is a (n x k) matrix.
I mean its obvious when the above is a quadratic form, but less so when it is a bivariate function.
2025-01-12 23:57:36.1736726256
Show that x'X'y=y'Xx
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Hint: $A = x'X'y$ is a $1 \times 1$ matrix, so $A = A'$.