NLA MT25, Gaussian random matrices


Flashcards

@Define a Gaussian random matrix.


A matrix $G \in \mathbb R^{m \times n}$ where $G _ {ij} \sim N(0, 1)$.

@State what is meant by the orthogonal invariance of Gaussian random matrices $G$.


The distribution of an orthogonal random matrix is invariant under orthogonal matrix, i.e. if:

  • $G$ is a Gaussian matrix
  • $Q$ is an orthogonal matrix independent of $G$

Then:

  • $QG$ and $GQ$ are both Gaussian random matrices



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