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John D. Cook
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Latest posts
Last updated about 15 hours ago
Converting between quaternions and rotation matrices
about 15 hours ago
In the previous post I wrote about representing rotations with quaternions. This...
Composing rotations using quaternions
about 15 hours ago
Every rotation in 3D fixes an axis [1]. This is Euler’s rotation...
A simple way to generate random points on a sphere
1 day ago
I recently ran across a simple way to generate random points uniformly...
Recamán’s sequence
2 days ago
I recently ran into Recamán’s sequence. N. J. A. Sloane, the founder...
Cycle order in period doubling region
3 days ago
The last four post have looked at the bifurcation diagram for the...
An island of stability in a sea of chaos
3 days ago
The last several posts have been looking at the bifurcation diagram below...
Spacing between branches
3 days ago
The last couple posts have been looking at the logistic bifurcation diagram...
The simple part of the logistic map isn’t that simple
4 days ago
Five years ago I wrote a blog post entitled Logisitic bifurcation diagram...
Knuth’s series for chi squared percentage points
9 days ago
In the latest two posts, we have needed to find the percentage...