191 reputation
26
bio website newsfare.com
location Cherry Hill, NJ
age 63
visits member for 2 years, 8 months
seen Apr 10 at 9:43
Freelance software contractor, specializing in FileMaker Pro

Jan
22
comment What are the most common pitfalls awaiting new users?
I disagree with m_goldberg about avoiding "replacements for general documentation." Each of the many gaps in Mathematica's documentation leads directly to a pitfall. In that situation, a gap filled is a pitfall avoided.
May
15
awarded  Commentator
May
15
comment 3D orbits and inaccuracy over time
The mathematical difficulties of getting even approximate closed-forms solutions for n > 2 bodies are not related to what happens in a numerical calculation. The calculations bypass any consideration of theory. There can be numerical accuracy problems when two bodies get very close to each other, but in fact, numerical solutions can provide very high accuracy if done with the proper attention to details of the calculations. Navigation for satellites and spacecraft are, I believe, all performed numerically.
Mar
27
comment Why round to even integers?
The methods discussed are simple deterministic algorithms, which of course people like. Another method might involve randomizing the rounding of a 5. But I think bookkeepers would really hate the idea of random bank transactions.
Jan
30
comment What are the most common pitfalls awaiting new users?
By a long mile, my biggest problem as a beginner was the tendency of the Front End to work for a long time and then crash. I cannot tell you how much time this wasted, because then I usually had to quit the application from Activity Monitor. After I installed a modified version of a previously circulated quit-on-any-message handler, the problem mostly went away. That is why I strongly believe stop on message should be a default-on feature of the Mathematica Front End.
Nov
21
awarded  Necromancer
Aug
10
awarded  Necromancer
Aug
10
comment How to abort on any message generated?
Thank you verbeia! As you correctly surmised, I could not figure out how to get the code to look right.
Aug
10
awarded  Editor
Aug
10
revised How to abort on any message generated?
deleted 4 characters in body
Aug
9
answered How to abort on any message generated?
Jul
31
comment Is there a quick way to find a built-in function by name search?
Thank you, b.gatessucks. I knew about the question mark, but I didn't know it would accept a wildcard. I guess Mathematica has a lot of these hidden features.
Jul
30
asked Is there a quick way to find a built-in function by name search?
Jul
30
comment Is it possible to colorize brackets in the notebook editor to see matches more easily?
You don't necessarily have to hit Return before each closing bracket; you can go back and put the Return characters in later, when you want to see the brackets lined up. As we all know, Mathematica treats Return differently from Enter -- an unfortunate inheritance from Apple's old development environment, MPW.
Jul
15
comment How to extract edgeweights from a graph
I have spent far too much time trying to understand the role played by a vertex's list position as opposed to the vertex's "name." If one's vertex "names" are consecutive integers, everything works pretty much as expected. The difficulty starts for me when I use MorphologicalGraph, which returns a graph having non-consecutive integer "names" assigned to the vertices. In fact, for MorphologicalGraph, the vertex names constitute a permutation of Range[n]. Hey, what's so confusing about that? Cheer up -- there are only (n! - 1) ways you can be wrong. Hint: use VertexIndex to get back to reality.
Jul
12
comment Vertices, their labels, and how to refer to them?
But if I write: codeg1 = Graph[{1 <-> 2, 2 <-> 10, 10 <-> 3, 3 <-> 4}, VertexLabels -> "Name"]; GraphPlot[g1,VertexLabeling->True] then the result uses only the digits 1 through 8. That is, at the very least, confusing, don't you think?
Jul
11
comment Cycles of length N in a graph
That worked very well for me. Thank you!
Jul
11
comment Cycles of length N in a graph
Wonderful! Except that I get "Subsets::toomany: "The number of subsets (316399053474504) indicated by Subsets[{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27‌​,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,<<734>>},{6‌​}] is too large; it must be a machine integer."
Jun
2
awarded  Supporter
May
31
awarded  Student