7.29 June 17, 2014
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Top new questions this week:
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[Smooth Peter de Jong
attractor]\url{http://mathematica.stackexchange.com/questions/50839/smooth-
peter-de-jong-attractor}
Today I was playing with Peter de Jong attractor.
At the bottom of the page I've linked there are beautiful examples like:
My attempts are not so great:
It is around 10^5 points. For more than ...
- asked by Kuba (17 votes), answered by KennyColnago (15 votes)
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[How would you efficiently implement
BinListsBy?]\url{http://mathematica.stackexchange.com/questions/50559/how-w
ould-you-efficiently-implement-binlistsby}
Let's say I have a list like this:
data = {{21, "Alice"}, {27, "Bob"}, {22, "Charles"}, {34, "Dora"}, {75,
"Eliza"}}
containing ages and names of persons. What I would like is a list of
e.g. ...
- asked by nikie (9 votes), answered by Mr.Wizard (8 votes)
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[Mathematica outliner's
capabilities]\url{http://mathematica.stackexchange.com/questions/50637/math
ematica-outliners-capabilities}
As my notebooks get larger, I often try to organize them with
titles/subtitles etc, structuring them as an outliner
(http://en.wikipedia.org/wiki/Outliner)
This also helps me as I try to structure a ...
- asked by alessandro (8 votes), answered by Mike Honeychurch (7 votes)
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[Control BarLegend
size]\url{http://mathematica.stackexchange.com/questions/50913/control-barl
egend-size}
I want to plot a big 2D array of experiment data. I need plot axes and
tick labels as well as a bar legend using BarLegend:
ArrayPlot[
Array[RandomInteger[100] &, {100, 100}],
PlotLegends -> ...
- asked by Johu (6 votes), answered by Johu (6 votes)
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[Skip header lines on
import]\url{http://mathematica.stackexchange.com/questions/50718/skip-heade
r-lines-on-import}
When importing a data file what are the comment symbols for Mathematica?
That is, given a file like this
blabla
bulbul
1 2 6 54 7 ...
..
what symbol do I have to put in front of header lines so ...
- asked by user3683367 (6 votes), answered by george2079 (7 votes)
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[How can I list all the 'countries 4000 km far from current
location'?]\url{http://mathematica.stackexchange.com/questions/50786/how-ca
n-i-list-all-the-countries-4000-km-far-from-current-location}
A friend said to me on Facebook that she is 4000km away. So I want to
try to guess where she is.
How can I find which countries are a given distance from my current
location?
- asked by Boti (5 votes), answered by Oska (14 votes)
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[Can I automatically stop operation that is too
slow?]\url{http://mathematica.stackexchange.com/questions/50746/can-i-autom
atically-stop-operation-that-is-too-slow}
I need to write code like this: Do operation 1, but if it takes more
that 5 seconds then stop it and do operation 2.
Is it possible to do this somehow without manual interruption?
- asked by user15933 (5 votes), answered by Nasser (8 votes)
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Greatest hits from previous weeks:
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[What is the fastest way to extract a substring from a huge
string?]\url{http://mathematica.stackexchange.com/questions/44175/what-is-t
he-fastest-way-to-extract-a-substring-from-a-huge-string}
I develop an algorithm to find the most common substrings of a given
length n up to a certain distance l in front of a pattern p in a huge
sequence S. E.g. I want to find the most common hexamers ...
- asked by g3kk0 (11 votes), answered by Leonid Shifrin (9 votes)
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[When running Mathematica from a Linux terminal, how can I prevent a
script from terminating upon
logout?]\url{http://mathematica.stackexchange.com/questions/42838/when-runn
ing-mathematica-from-a-linux-terminal-how-can-i-prevent-a-script-from}
I am running Mathematica on a remote Linux cluster, by the terminal,
using the math command. (I do not have access to a terminal GUI. For
example, when I type the command mathematica, I get this ...
- asked by Andrew (10 votes), answered by shrx (2 votes)
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Can you answer these?
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[Understanding performance: graph connected
components]\url{http://mathematica.stackexchange.com/questions/50523/unders
tanding-performance-graph-connected-components}
I need to analyze directed graphs with 10M edges, 1M vertices, and 300K
strongly connected components, so that the largest one contains 400K
vertices.
I read some explanations of Leonid Shifrin here, ...
- asked by Grisha Kirilin (3 votes)
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[Natural boundary conditions variational
methods]\url{http://mathematica.stackexchange.com/questions/50526/natural-b
oundary-conditions-variational-methods}
I am working on a problem of the calculus of variations. From the
Variational Methods package, I can very conveniently use EulerEquations
to get stationarity conditions in the form of Euler-Lagrange ...
- asked by Marijnn (1 vote)
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[How to find a scaling parameter in matrix inversion process by
MMA?]\url{http://mathematica.stackexchange.com/questions/50660/how-to-find-
a-scaling-parameter-in-matrix-inversion-process-by-mma}
I simply would like to find the inverse of a given matrix $A$ by the
iterative method $X_{k+1}=X_k(2I-AX_k)$ using
$X_0=\frac{1}{\sigma_{max}^2}A^*$. An example is as follows
SeedRandom[123]; m = n = ...
- asked by Fazlollah Soleymani (1 vote)