John D. Cook | Applied Mathematics Consulting
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Companies come to us for help data analysis and data privacy. Clients have included Amazon, Google, Microsoft, law firms, start-ups, and smaller businesses.
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Cryptic but consistent
Suppose you've never worked at the command line and you're reading a book about the bash shell. You read that !$ is a shortcut to refer to the last word of the previous command. That little fact will almost certainly not stick in your head for a couple re
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Dogs and fat tails
I was reading a blog post on boat names because it was on Hacker News this morning. The post contained a link to a data set on dog names in NYC and I poked around the data a little. The top names were not at all what I expected, but then again this is lim
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Manually unbreakable cryptography
Suppose you were able to go back in time, to an era before computers, and give someone contemporary cryptography. Encryption methods that are essentially unbreakable now would certainly be unbreakable then. But there's a catch: not only do attackers not h
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Learning from historical mistakes
The following extraordinary paragraph comes from Knuth's TAOCP Volume 4A, right before the last set of exercises. Many of the exercises below ask a modern reader to find and/or to correct errors in the literature of bygone days. The point is not to gloat
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Inverse differential equations
In science and engineering classes, you might describe a system using Newton's laws and end up with a differential equation. You then solve the differential equation, analytically or numerically, to see how the solutions behave. You might also do the oppo
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