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9 votes

Optimized Lanczos method for finding eigenvalues of $A \otimes B$

There isn't much complicated behind this idea; it's just that since Lanczos is a black-box method you can use any method of your choice to compute the products $v\mapsto (A\otimes B)v$ needed in the ...
Federico Poloni's user avatar
1 vote

What do diagonal (DOF-to-self) terms of stiffness matrix physically mean?

Consider a simple spring with stiffness $k$ lying along the x-axis with the degrees of freedom being the x-displacements at the two ends. We have the matrix equation \begin{equation} \left\{\begin{...
Bill Greene's user avatar
  • 6,144

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