A couple of questions in comments on recent blog posts have prompted me to discuss matrix condition numbers.... read more >>

# What is the Condition Number of a Matrix?

Posted by **Cleve Moler**,

**Category:**- Matrices,
- Numerical Analysis,
- Performance

Blogs

Posted by **Cleve Moler**,

A couple of questions in comments on recent blog posts have prompted me to discuss matrix condition numbers.... read more >>

**Category:**- Matrices,
- Numerical Analysis,
- Performance

Posted by **Cleve Moler**,

During the SIAM Annual Meeting this summer in Boston there will be a special minisymposium Wednesday afternoon, July 13, honoring Charlie Van Loan, who is retiring at Cornell. (I use "at" because he's not leaving Ithaca.) I will give a talk titled "19 Dubious Way to Compute the Zeros of a Polynomial", following in the footsteps of the paper about the matrix exponential that Charlie and I wrote in 1978 and updated 25 years later. I really don't have 19 ways to compute polynomial zeros, but then I only have a half hour for my talk. Most of the methods have been described previously in this blog. Today's post is mostly about "roots".... read more >>

Posted by **Cleve Moler**,

SC15, the International Conference for High Performance Computing, Networking, Storage and Analysis, was held in Austin, Texas, last week, November 15 through 20. This is the largest trade show and conference that MathWorks participates in each year.... read more >>

**Category:**- History,
- People,
- Performance,
- Supercomputing,
- Travel

Posted by **Cleve Moler**,

This is the third in a multi-part series on the MATLAB random number generators. MATLAB has used variants of George Marsaglia's ziggurat algorithm to generate normally distributed random numbers for almost twenty years.
... read more >>

**Category:**- Algorithms,
- History,
- People,
- Performance,
- Random Numbers

Posted by **Cleve Moler**,

By reaching 33.86 petaflops on the LINPACK Benchmark, China's Tianhe-2 supercomputer has just become the world's fastest computer. The technical computing community thinks of LINPACK not as a matrix software library, but as a benchmark. In that role LINPACK has some attractive aspects, but also some undesirable features.... read more >>

**Category:**- History,
- Performance,
- Supercomputing

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