================================== Top new questions this week: ==================================
[Documentation of the frequently-used functions in the context of Internal‘ and Compile‘] http://mathematica.stackexchange.com/questions/82790/documentation-of-the-frequently-used-functions-in-the-context-of-internal-and-c
In this site, I have gradually found out that there is a collection of functions in all kinds of answers. For instance, Compile‘GetElement, Internal‘Bag,etc. However, these functions are undocumented. ...
- asked by Shutao Tang (21 votes), answered by blochwave (12 votes)
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[Does Mathematica store hidden information for matrix objects?]http://mathematica.stackexchange.com/questions/82854/does-mathematica-store-hidden-information-for-matrix-objects
Bug introduced in 10.0.0 and persisting through 10.1.0 or later
I found a case where calling one built-in function (HermitianMatrixQ) for a given matrix changes the behavior of another built-in ...
- asked by user3126814 (20 votes)
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[What’s going on with performance of Tally here?]http://mathematica.stackexchange.com/questions/82978/whats-going-on-with-performance-of-tally-here
Observe:
l1 = l2 = RandomInteger[1, 100000, 1000000]; l2[[-1]] = -1; t1 = First@Timing@Tally[l1]; t2 = First@Timing@Tally[l2];
l1 = l2 = RandomInteger[1, 100000, 1000100]; l2[[-1]] = -1; t3 = ...
- asked by ciao (16 votes), answered by Michael E2 (4 votes)
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[Hightlight all the self-intersections of a Lissajous figure]http://mathematica.stackexchange.com/questions/83118/hightlight-all-the-self-intersections-of-a-lissajous-figure
This graphalso known as a Lissajous figurecontains so many self-intersections.How can I highlight them?
ParametricPlot[{Sin[100 t], Sin[99 t]}, {t, 0, 2 Pi}, PlotRange -> All]
- asked by WateSoyan (13 votes), answered by 2012rcampion (22 votes)
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[Is MathieuC for moderately large imaginary arguments broken?] http://mathematica.stackexchange.com/questions/83032/is-mathieuc-for-moderately-large-imaginary-arguments-broken
I’m trying to plot MathieuC[-3,0.3,I x] for \(x\in [0,10]\), and here’s what I get (using ListPlot and Table instead of Plot to make computation faster and use a regular grid):
...
- asked by Ruslan (13 votes)
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[In 10.1.0 BenchmarkPlot doesn’t work?] http://mathematica.stackexchange.com/questions/83226/in-10-1-0-benchmarkplot-doesnt-work
In Mathematica 10.1.0 BenchmarkPlot from the GeneralUtilities package doesn’t work; copying Taliesin Beynon’s initial use of the function on this site:
Needs["GeneralUtilities`"] myPosIdx[x_] := ...
- asked by Mr.Wizard (12 votes), answered by Mr.Wizard (12 votes)
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[How to ContourPlot a function of the coordinates on the Earth’s surface on a map projection] http://mathematica.stackexchange.com/questions/83050/how-to-contourplot-a-function-of-the-coordinates-on-the-earths-surface-on-a-map
There are two similar questions (this and this), but one is too specific and the other is apparently not clear and has no answers. I’ll try to make the question more complete.
Suppose you have a ...
- asked by unlikely (12 votes), answered by Kuba (13 votes)
================================== Greatest hits from previous weeks: ==================================
[Is it possible to export the equations from Mathematica to MATLAB?] http://mathematica.stackexchange.com/questions/14035/is-it-possible-to-export-the-equations-from-mathematica-to-matlab
Is it possible to export the output expressions from Mathematica computations (e.g., equations) in valid MATLAB syntax?
- asked by Seyhmus Gungoren (23 votes), answered by The Toad (30 votes)
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[How do I draw a pair of buttocks?] http://mathematica.stackexchange.com/questions/66538/how-do-i-draw-a-pair-of-buttocks
I’m trying to develop a function which 3D plot would have a buttocks like shape.
Several days of searching the web and a dozen my of own attempts to solve the issue have brought nothing but two ...
- asked by Simpleton Jack (216 votes), answered by mikuszefski (337 votes)
================================== Can you answer these? ==================================
[Negative accuracy numerics ( 0“-128 notation )] http://mathematica.stackexchange.com/questions/82683/negative-accuracy-numerics-0-128-notation
What does it mean to have a negative accuracy number?
I understand 0“128 to mean "the number zero to 128 decimal points". Mathematica corroborates this:
In[1]:= 0``128 < 1 (* Out[1]= True *) ...
- asked by jjstankowicz (6 votes)
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[Orthogonal projection of NURBS surface]http://mathematica.stackexchange.com/questions/82855/orthogonal-projection-of-nurbs-surface
How can one make an orthogonal projection of NURBS surface? For example the one from wolfram demos http://demonstrations.wolfram.com/DesigningACarBodyWithSplines/.
- asked by justartem (2 votes)
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[DiracDelta and version 10.0.0] http://mathematica.stackexchange.com/questions/83198/diracdelta-and-version-10-0-0
Note: This issue seems to affect version 10.0.0 only and is fixed in 10.0.1, 10.0.2, and 10.1
When evaluating the following two inputs:
Integrate[DiracDelta[1-x] DiracDelta[y-2] Sin[x] Cos[y], x, ...
- asked by Nid (2 votes)