#### Problems

4.1 Show that the set of equations

$\Sigma \mathit{\theta}=\mathit{p}$

has a unique solution if Σ > 0 and infinite many if Σ is singular.

4.2 Show that the set of equations

$\Sigma \mathit{\theta}=\mathit{p}$

always has a solution.

4.3 Show that the shape of the isovalue contours of the mean-square error (J(θ)) surface

$J(\mathit{\theta})=J({\mathit{\theta}}_{*})+{(\mathit{\theta}-{\mathit{\theta}}_{*})}^{\text{T}}\Sigma (\mathit{\theta}-{\mathit{\theta}}_{*})$

are ellipses whose axes depend on the eigenstructure of Σ.

4.4 Prove that if the true relation between ...

Get *Machine Learning* now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.