7.35 May 6, 2014
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Top new questions this week:
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[May the Fourth be with
you]\url{http://mathematica.stackexchange.com/questions/47268/may-the-fourt
h-be-with-you}
Happy Star Wars day. I was playing around with the image manipulation
functions in Mathematica in an attempt to recreate the Star Wars crawl.
There's an HTML/CSS implementation which is in my ...
- asked by bobthechemist (18 votes), answered by Kuba (19 votes)
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[Mathematica 9 cannot solve a difference equation that Mathematica 8
can]\url{http://mathematica.stackexchange.com/questions/47097/mathematica-9
-cannot-solve-a-difference-equation-that-mathematica-8-can}
Consider
RSolve[{a[n + 1] == 2 a[n] + n (1 + 2^n), a[1] == 1}, a[n], n]
Mathematica 8 can solve this quickly, but Mathematica 9, even after
being allowed to run for a long time, cannot giva a ...
- asked by mathe (14 votes), answered by m_goldberg (3 votes)
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[Taking Top K
Occurrences]\url{http://mathematica.stackexchange.com/questions/47120/takin
g-top-k-occurrences}
Having millions of numbers in a list, I want to take top K occurrences.
MMA Commonest is very slow so I write my own versions:
a=RandomInteger[{1,1000000},50000000];
...
- asked by Mohsen Afshin (12 votes), answered by Mr.Wizard (11 votes)
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[Parametric Interpolation of 2D
data]\url{http://mathematica.stackexchange.com/questions/47332/parametric-i
nterpolation-of-2d-data}
I want to create an interpolation through the following 2dim data
points:
data = {{22.78, 0.2431}, {22.06, 0.262}, {21.51, 0.2774}, {21.07,
0.2905}, {20.7, 0.302}, {20.38, 0.3121}, {20.1, ...
- asked by Martin (11 votes), answered by bobthechemist (11 votes)
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[Importing an mx file into a
context]\url{http://mathematica.stackexchange.com/questions/47110/importing
-an-mx-file-into-a-context}
Consider the following simple code which dumps the global context:
var = 5;
DumpSave["test.mx", "Global`"];
Now, in a new notebook, I would like to import var in another context.
Trying
...
- asked by Massimo Ortolano (10 votes), answered by Leonid Shifrin (11
votes)
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[Faster "stuttering"
accumulate?]\url{http://mathematica.stackexchange.com/questions/47296/faste
r-stuttering-accumulate}
Given some list of arbitrary precision numbers, e.g. (actual lists are
1M+ elements long):
test={0, 2, 2, 47839283, 2, 0, 0, 2, 0, 1, 2, 0}
I need to accumulate the list, but where a specified ...
- asked by rasher (9 votes), answered by Mr.Wizard (10 votes)
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[Why is this semicolon in
red?]\url{http://mathematica.stackexchange.com/questions/47113/why-is-this-
semicolon-in-red}
I have a piece of code that works well, but when I put a semicolon after
a plotting statement, the semicolon appears in red. What's the error?
- asked by Mika Ike (9 votes), answered by Kuba (12 votes)
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Greatest hits from previous weeks:
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[Generate a Unit Circle
Trigonometry]\url{http://mathematica.stackexchange.com/questions/2456/gener
ate-a-unit-circle-trigonometry}
Struggling often with Trigonometry I would like to have some code to
generate this Unit Circle Trigonometry. Would be of great help when I
need to transform some data :
- asked by 500 (13 votes), answered by Mark McClure (27 votes)
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[Can Mathematica do symbolic linear
algebra?]\url{http://mathematica.stackexchange.com/questions/3242/can-mathe
matica-do-symbolic-linear-algebra}
For instance, is there some way I can say "let A and B be arbitrary real
$m\times n$ and $k\times m$ matrices,
Simplify[Transpose[Transpose[A].Transpose[B]]]" and Mathematica would
simplify it to B.A?
...
- asked by nikie (22 votes), answered by helen (11 votes)
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Can you answer these?
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[Travel time sweet spot using: Mathematica and Google Maps
API]\url{http://mathematica.stackexchange.com/questions/47198/travel-time-s
weet-spot-using-mathematica-and-google-maps-api}
I want to use Mathematica to do some time minimisation calculations
calling on Google Maps API for travel time data. I'm concerned with
travel time, e.g. along roads (by car or walk) and not linear ...
- asked by PeteCog (1 vote)
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[Graphics always rendered twice with SimpleFrontEnd
example?]\url{http://mathematica.stackexchange.com/questions/47304/graphics
-always-rendered-twice-with-simplefrontend-example}
I am looking at the Java SimpleFrontEnd example provided by Mathematica.
Everything goes well except it always renders graphics twice.
Can anyone help me with this?
BTW: I am using version 9 under ...
- asked by Michael (2 votes)
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[How to specify initial condition including integral equations in the
case of the dirac
equations?]\url{http://mathematica.stackexchange.com/questions/47358/how-to
-specify-initial-condition-including-integral-equations-in-the-case-of-t
he}
Hi I am trying to solve a system of differential equation with NDSolve.
The problem is I have like $3$ (maybe $5$) boundary conditions, but only
$2$ differential equations. The equations to solve are ...
- asked by Terratoss (1 vote)