23,667 reputation
42672
bio website none
location Ann Arbor, MI
age 77
visits member for 2 years, 5 months
seen 8 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. My main reason for joining StackExchange is to participate in Mathematica.SE. I enjoy answering question when I can, but I also enjoy working at making the site a better place to visit.

I started using Mathematica in 1997 (Ver. 3). I am currently using Ver. 10.0.2. 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 the classical Greek synthetic form and in the more modern analytical form.


8h
revised How can I solve my easy system of equations?
Fixed typo
8h
revised Plot gives different result than direct evaluation (Plot[f[x]] obtains answer while f[x] fails)
deleted 16 characters in body
8h
revised Laplace PDE in a polar coordinate system
Routine clean-up
17h
reviewed Edit Keyboard shortcut conflict
17h
revised Keyboard shortcut conflict
improved question formatting; made English more idiomatic
17h
reviewed Approve How do I get my equation to have the form $(x-a)^2 + (y-b)^2 + (z-c)^2-d = 0$?
17h
reviewed Edit How can I get the inverse of my function?
17h
revised How can I get the inverse of my function?
added 1 character in body
17h
revised Select sub-lists of common length from a list
added 1 character in body
17h
revised Select sub-lists of common length from a list
Added a second answer
18h
revised Select sub-lists of common length from a list
revised answer to fit the revised question
18h
reviewed Reopen Select sub-lists of common length from a list
18h
revised Package Function Confusion
Improved formatting
18h
reviewed No Action Needed Package Function Confusion
18h
reviewed Reviewed Find out domain after change of variable in integral of d dimensions
18h
revised Find out domain after change of variable in integral of d dimensions
Improved formatting
18h
revised How can I solve my easy system of equations?
Minor clean-up
18h
answered How can I solve my easy system of equations?
20h
revised How can I get the inverse of my function?
Routine clean-up
20h
comment Difficulty with Manipulate that has same variables as other code lines in a notebook
@David. Sorry, I forgot to localize the variable r. I have edited my answer to fix the omission by adding the control definition {r, None}