20,766 reputation
42568
bio website none
location Ann Arbor, MI
age 76
visits member for 2 years
seen 6 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.


Jul
14
revised Multiple down-values with exactly the same lefthand side
Posed an additional question raised by Mr.Wizard's answer
Jul
14
comment Multiple down-values with exactly the same lefthand side
@Nasser. I suspect it must involve my using Condition.
Jul
14
revised Multiple down-values with exactly the same lefthand side
added 18 characters in body
Jul
14
asked Multiple down-values with exactly the same lefthand side
Jul
14
reviewed Reopen Table to text string
Jul
14
revised Addition and subtraction of TimeObjects in v10
added 5 characters in body
Jul
13
revised Addition and subtraction of TimeObjects in v10
Corrected reference to dates to be references to times
Jul
13
comment Addition and subtraction of TimeObjects in v10
Further, a TimeObject represents an event, a point in time. Joe can't work for TimeObject[{8,0,0}]. That doesn't represent 8 hours (a time quantity), but 8 AM.
Jul
13
comment Addition and subtraction of TimeObjects in v10
DateObject[] // FullForm gives DateObject[List[2014,7,13],TimeObject[List[12,19,4.867536`]]]. That should explain the difference.
Jul
13
answered Addition and subtraction of TimeObjects in v10
Jul
13
reviewed No Action Needed Addition and subtraction of TimeObjects in v10
Jul
13
comment Why don't some functions work in trial versions of Mathematica?
It's because you have the trial version. Some features, including anything to do with exporting, are crippled in the trial version.
Jul
13
reviewed No Action Needed How to construct a polyhedron from its vertex graph?
Jul
13
revised Transfer graphics from Mathematica to Word without loss of quality
Made English more idiomatic.
Jul
13
reviewed Looks OK Using “With” outside a function on its parameters
Jul
13
reviewed Looks OK How can I programmatically specify the positioning of a window at the time of its creation?
Jul
12
comment Swap elements in list without copy
@Danvil. Not that I know of. I once spent two days trying to find a way make Mathematica modify a list in-place, but failed.
Jul
12
comment Swap elements in list without copy
{a, b} = {b, a} preforms a swap in Mathematica, no temporary variable required.
Jul
12
comment Swap elements in list without copy
@nikie. Yes, it would. As for edo's timing, what's to explain? His timing only tells us Mathematica can copy lists very fast.
Jul
12
revised Swap elements in list without copy
added 4 characters in body