20,846 reputation
42568
bio website none
location Ann Arbor, MI
age 76
visits member for 2 years
seen 14 hours ago

I am a retired software developer. I retired at the end of 2003 and since then my computer programming activities have been for recreational purposes. I find Mathematica excellent for that.

I started using Mathematica in 1997 (Ver. 3). I am currently using Ver. 9. Although I have used Mathematica for all kinds of stuff, I use it mostly to pursue my long standing interest in Euclidean geometry, both in its classical Greek synthetic form and in its more modern analytical/transformational form.


Oct
20
revised Equation of a transformed (roatted) ellipsoid
Routine clean-up
Oct
20
revised Restrict plot of object to be below a given plane in a ContourPlot3D
Routine clean-up
Oct
20
revised Restrict plot of object to be below a given plane in a ContourPlot3D
Improved formatting
Oct
20
answered Matching a case when one element in a pair is Null
Oct
20
revised Matching a case when one element in a pair is Null
Minor clean-up
Oct
19
revised Plane Geometry Diagrams With Labels
deleted 7 characters in body
Oct
19
revised Mean curvature of Sphere
deleted 14 characters in body
Oct
19
revised How do I generate cross sections of a 3D graphic?
deleted 11 characters in body; edited title
Oct
19
revised Identically styled cells from ToBoxes and Cell do not align
Improved formatting
Oct
19
revised Higher-order, nonlinear differential equation with Initial Values
edited tags
Oct
19
revised Derivative of an expression containing a symbolic sum
Routine clean-up
Oct
18
comment Rationalize complex numbers
Seeing as 4/3 + I N[ Sqrt[2]/3] is immediately and automatically converted to 1.33333 + 0.471405 I, I don't see how it can be done.
Oct
18
revised Plotting two recursive functions
Routine clean-up
Oct
18
comment How to tell Eigensystem the type of the elements comprising a matrix I would like to diagonalize
Your gravatar is a near-twin of mine. I am surprised I never noticed this before since you have been participating in Mathematica.SE for well over a year. However, I only noticed now when I saw my gravatar next to yours after editing this question.
Oct
18
revised How to tell Eigensystem the type of the elements comprising a matrix I would like to diagonalize
Made English more idiomatic
Oct
18
reviewed Leave Open Concisely returning a position in an array with an index variable
Oct
18
revised DSolve returning { } when given my ODE
Routine clean-up
Oct
18
comment create a function that converts a character string consisting of lowercase letters of the english alphabet to a number
The English alphabet has 26 letters, so how does z end up getting assigned 27?
Oct
17
comment What is the best way to flatten a linked list with lists as values?
+1 Your answer is very enlightening. The test I referred to in my comment to the question only looked at ways of flattening the usual linked lists. Flatten and Partition are still good for that. I didn't think to use a bag because I didn't know that bags existed in Mathematica. I would have happily used your AngleBracket idea had I been clever enough to think of it.
Oct
17
reviewed Leave Open How to plot multivariate tabular data