## The curse of non-unique eigenvectors

A SAS customer asked, "I computed the eigenvectors of a matrix in SAS and in…

By Rick Wicklin 3

A SAS customer asked, "I computed the eigenvectors of a matrix in SAS and in…

By Rick Wicklin 0

Monte Carlo techniques have many applications, but a primary application is to approximate the probability…

By Rick Wicklin 1

At a conference last week, a presenter showed SAS statements that compute the logarithm of…

By Rick Wicklin 1

This article describes how you can evaluate the Lambert W function in SAS/IML software. The…

By Rick Wicklin 1

Edmond Halley (1656-1742) is best known for computing the orbit and predicting the return of…

By Rick Wicklin 2

I was eleven years old when I first saw Newton's method. No, I didn't go…

By Rick Wicklin 1

Statistical programmers often need to evaluate complicated expressions that contain square roots, logarithms, and other…

By Rick Wicklin 2

In my article about finding an initial guess for root-finding algorithms, I stated that Newton's…

By Rick Wicklin 5

A SAS programmer asked an interesting question on a SAS Support Community. The programmer had…

By Rick Wicklin 3

A common question from statistical programmers is how to compute the rank of a matrix…