20,766 reputation
42568
bio website none
location Ann Arbor, MI
age 76
visits member for 2 years
seen 3 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.


1d
comment Equation of a transformed ellipsoid
I am having trouble with trying to understand what you are asking. 1) you use left-handed coordinate system in your diagram. This in not consistent with Mathematica's way of plotting with a right-handed coordinate system. 2) You ask about doing a rotation about the y-axis, but your diagram shows a translation along the x-axis. 3) you introduce a parameter h in you volume expression without explanation or defintion.
1d
revised Equation of a transformed ellipsoid
Routine clean-up
1d
revised Restrict plot of object to be below a given plane in a ContourPlot3D
Routine clean-up
1d
revised Restrict plot of object to be below a given plane in a ContourPlot3D
Improved formatting
1d
answered Matching a case when one element in a pair is Null
1d
revised Matching a case when one element in a pair is Null
Minor clean-up
1d
revised Plane Geometry Diagrams With Labels
deleted 7 characters in body
1d
revised Mean curvature of Sphere
deleted 14 characters in body
1d
revised How do I generate cross sections of a 3D graphic?
deleted 11 characters in body; edited title
1d
revised Identically styled cells from ToBoxes and Cell do not align
Improved formatting
1d
reviewed Leave Closed A Problem on Evaluating the best fitting distribution and confidence intervals within a Custom Distribution
2d
revised Higher-order, nonlinear differential equation with Initial Values
edited tags
2d
revised Derivative of an expression containing a symbolic sum
Routine clean-up
2d
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.
2d
revised Plotting two recursive functions
Routine clean-up
2d
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.
2d
revised How to tell Eigensystem the type of the elements comprising a matrix I would like to diagonalize
Made English more idiomatic
2d
reviewed Leave Open Concisely returning a position in an array with an index variable
2d
revised DSolve returning { } when given my ODE
Routine clean-up
2d
comment Include Formatting Save As .nb to .m
I can not speak for WRI as to why they chose to implement their code editor the way they did, but .nb files have never stored indentation information for input cells.