7.44 February 11, 2014
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Top new questions this week:
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[A set of
elements]\url{http://mathematica.stackexchange.com/questions/41753/a-set-of
-elements}
I have a set of say 100 numbers {1,3,7,11,19,...3971}. All elements are
previously determined. I want to check whether 376 belongs to this set
or not. what is the fastest way?
Thanks
- asked by Meqdad (9 votes), answered by Mr.Wizard (10 votes)
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[Unwanted PlotMarkers appear at non-existent
places]\url{http://mathematica.stackexchange.com/questions/41706/unwanted-p
lotmarkers-appear-at-non-existent-places}
In this simple code
ListPlot[Table[Sin[x], {x, 0, Pi, .1}], PlotRange -> {0, 0.5},
Joined -> True, PlotMarkers -> Automatic, ClippingStyle ->
None, Frame -> True]
We can see that ...
- asked by saturasl (9 votes), answered by Coolwater (9 votes)
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[Find positions of items in a list based on
neighbours]\url{http://mathematica.stackexchange.com/questions/41937/find-p
ositions-of-items-in-a-list-based-on-neighbours}
How can I select items from a list where the selection criterion depends
on the neighbouring items?
For example select all indices where a change has occurred with respect
to the previous element in ...
- asked by Danvil (8 votes), answered by Simon Woods (14 votes)
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[How to run mathematica scripts without initializing the kernel every
time]\url{http://mathematica.stackexchange.com/questions/41742/how-to-run-m
athematica-scripts-without-initializing-the-kernel-every-time}
I have written a Mathematica script that is to be run periodically on a
Raspberry Pi. The code takes about 3 seconds to execute if I test it in
a CLI Mathematica session. However, when I execute the ...
- asked by shrx (7 votes), answered by shrx (1 vote)
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[Get Coordinates 4 significant digits
limitation]\url{http://mathematica.stackexchange.com/questions/42112/get-co
ordinates-4-significant-digits-limitation}
The tool "get coordinates" (clicking on a plot), seems to work with a
fixed number of significant digits (4), in a way that we can quickly
lose sensibility (the tool really becomes useless). The ...
- asked by P. Fonseca (6 votes), answered by chuy (2 votes)
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[How to take derivative of parameterized
coordinate?]\url{http://mathematica.stackexchange.com/questions/41907/how-t
o-take-derivative-of-parameterized-coordinate}
Suppose I have a vector in $\mathbb{R}^n$ but $n$ is not known in
advance. I want to be able to write functions which operate on the
components of that vector, and then I'd like to be able to take ...
- asked by Tom (6 votes)
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[How to randomly erode a 3D distribution of points with Mma
7.0?]\url{http://mathematica.stackexchange.com/questions/41801/how-to-rando
mly-erode-a-3d-distribution-of-points-with-mma-7-0}
Suppose we have a 3D distribution of points, like the spherical ball
example below :
Ball[num_]:=Table[
{
#1 Sqrt[1-#2^2]Cos[#3],
#1 Sqrt[1-#2^2]Sin[#3],
#1 #2
}
&[
...
- asked by Cham (6 votes), answered by chuy (6 votes)
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Greatest hits from previous weeks:
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[Marking points of intersection between two
curves]\url{http://mathematica.stackexchange.com/questions/10472/marking-po
ints-of-intersection-between-two-curves}
I'm trying to illustrate the solutions numerically and graphically for
an equation such as Tan[x] == x. I think I did everything ok except I
wanted to mark each intersection between Tan[x] and x.
...
- asked by fiz (20 votes), answered by belisarius (30 votes)
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[What are the most common pitfalls awaiting new
users?]\url{http://mathematica.stackexchange.com/questions/18393/what-are-t
he-most-common-pitfalls-awaiting-new-users}
As you may already know, Mathematica is a wonderful piece of software.
However, it has a few characteristics that tend to confuse new (and
sometimes not-so-new) users. That can be clearly seen from ...
- asked by belisarius (121 votes), answered by Michael E2 (64 votes)
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Can you answer these?
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[OpenCLLink specify grid size when calling
function]\url{http://mathematica.stackexchange.com/questions/41992/openclli
nk-specify-grid-size-when-calling-function}
The Mathematica documentation (section "Details":
https://reference.wolfram.com/mathematica/OpenCLLink/ref/OpenCLFunction.
html) states that:
On launch, if the number of threads is not specified ...
- asked by user2224780 (1 vote)
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[Import merged cells from
Excel]\url{http://mathematica.stackexchange.com/questions/42069/import-merg
ed-cells-from-excel}
in a scientific paper I've found some data. I've saved it in Excel from
a .pdf file.
But it was saved in a strange way: all data are in two cells in Excel.
In large merged cells.
Now when I try to ...
- asked by Mary (1 vote)
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[Mysterious behavior of Precision for complex
arrays]\url{http://mathematica.stackexchange.com/questions/42075/mysterious
-behavior-of-precision-for-complex-arrays}
Mysterious behavior of Precision:
{{1.0+I*0.0},{0.0+I*0.0}} // SetPrecision[#,30]& // Precision //
Print;
0.
{{1.0},{0.0}} // SetPrecision[#,30]& // Precision // Print;
30.
Why is ...
- asked by John Sidles (3 votes)