7.32 May 27 2014
==================================
Top new questions this week:
==================================
[Why won't Parallelize speed up my code?]
<http://mathematica.stackexchange.com/questions/48295/why-wont-parallelize-speed-up-my-code>
What reasons are there that can cause parallelized Mathematica code not
to run with full performance?
- asked by Szabolcs (18 votes), answered by Szabolcs (26 votes)
----------------------------
[High-quality RegionPlot3D for logical combinations of
predicates]\url{http://mathematica.stackexchange.com/questions/48486/high-q
uality-regionplot3d-for-logical-combinations-of-predicates}
Unlike RegionPlot, RegionPlot3D copes poorly with logical combinations
of predicates (&&, ||), which should result in sharp edges in
the region to be plotted. Instead, these edges are usually ...
- asked by Rahul Narain (11 votes), answered by Simon Woods (10 votes)
----------------------------
[Correct way to integrate a certain
function]\url{http://mathematica.stackexchange.com/questions/48437/correct-
way-to-integrate-a-certain-function}
I want to integrate
$$
\int_{0}^{2\pi} dt_1 \frac{a + b*\cos(t_1 - t_2)}{c + d*\cos(t_1 -
t_2)}
$$
where $a, b, c, d, t_2$ are real numbers and $c + d > 0$ & $0
\leq t_2 \leq 2\pi$.
I used ...
- asked by vik (9 votes), answered by Michael E2 (4 votes)
----------------------------
[How do I get Mathematica to return a function call
unevaluated?]\url{http://mathematica.stackexchange.com/questions/48349/how-
do-i-get-mathematica-to-return-a-function-call-unevaluated}
How do I get Mathematica to return a function call (conditionally)
unevaluated? I expect this may use the slightly-mysterious Hold
function.
As a toy example, suppose I want to define AlgebraicQ such ...
- asked by Charles (9 votes), answered by Szabolcs (9 votes)
----------------------------
[Why is plot legend
unsafe?]\url{http://mathematica.stackexchange.com/questions/48291/why-is-pl
ot-legend-unsafe}
Every time I open a notebook contains a legend, I get the message
warning that it's not safe.
Why does this happen and how to fix it?
- asked by xslittlegrass (9 votes), answered by Szabolcs (12 votes)
----------------------------
[Faster way to compute the distance from a point to a surface in
3D]\url{http://mathematica.stackexchange.com/questions/48565/faster-way-to-
compute-the-distance-from-a-point-to-a-surface-in-3d}
I am trying to compute the shortest distance between a point and a
triangle in 3D
distance[point_, {p1_, p2_, p3_}] := Module[{p, s, t, sol},
p = s*p1 + (1 - s)*(t*p2 + (1 - t)*p3);
...
- asked by tintin (8 votes), answered by RunnyKine (15 votes)
----------------------------
[Does the syntax coloring I see indicate a real
problem?]\url{http://mathematica.stackexchange.com/questions/48432/does-the
-syntax-coloring-i-see-indicate-a-real-problem}
I need a behaviour provided by:
x = 2;
Block[{x = HoldForm[x]}, x]
x
FrontEnd marks this syntax as not quite correct.
It has not caused me any troubles so far so my question is: could it
...
- asked by Kuba (8 votes), answered by halirutan (6 votes)
==================================
Greatest hits from previous weeks:
==================================
[How many Christmas
gifts?]\url{http://mathematica.stackexchange.com/questions/39338/how-many-c
hristmas-gifts}
This question is based on the old song, The Twelve Days of Christmas
In a comment made on a recent question, Yves Klett remarked, "no
seasonal questions this year?" This reminded me of one I solved ...
- asked by m_goldberg (18 votes), answered by rm -rf (23 votes)
----------------------------
[How to generate a random
snowflake]\url{http://mathematica.stackexchange.com/questions/39361/how-to-
generate-a-random-snowflake}
'Tis the season...
And it's about time I posed my first question on Mathematica Stack
Exchange.
So, here's an holiday quest for you Graphics (and P-Chem?) gurus.
What is your best code for generating ...
- asked by Peltio (87 votes), answered by Silvia (117 votes)
==================================
Can you answer these?
==================================
[Diagonalization in
parallel]\url{http://mathematica.stackexchange.com/questions/48416/diagonal
ization-in-parallel}
I would like to diagonalize one unitary non-sparse matrix of size 12870
with complex number entries (not symbols, this is really a numerical
problem). Is is possible to make eigensystem run in ...
- asked by lagoa (1 vote)
----------------------------
[Package
FiniteFields]\url{http://mathematica.stackexchange.com/questions/48379/pack
age-finitefields}
In a Mathematica session, I evaluate:
Needs["FiniteFields`"];
fld = GF[2];
Now, for example, I'd like to compute $a^3+a^5$ for $a \in{Z_2}$. The
result I'd like to have is $0$, because in $Z_2$, ...
- asked by user14545 (1 vote)
----------------------------
[When to use indexed
variables]\url{http://mathematica.stackexchange.com/questions/48602/when-to
-use-indexed-variables}
Still learning the fundamentals of the language I would like to ask you
what advantages there might be in writing something like:
a[1] = 2;
a[2] = 4;
a[3] = "x";
It seems to me that it is always ...
- asked by eldo (3 votes)