2.33.1 Top new questions this week

2.33.1.1 How to determine if two mutable data structures are the same?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=218535

How can I determine if two mutable data structures (DataStructure) are truly the same? I do not mean checking if they have the same value. I mean checking if they are the same data structure, i.e. ...

asked by Szabolcs ( https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 ) 15 votes

answered by ilian ( https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=145 ) 14 votes

2.33.1.2 Is there official documentation for official documentation and getting help system of Mathematica?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=217230

Mathematica has very high quality and extensive documentation and good getting help system (? Solve as an example; there maybe are more too). Is there all including official documentation about ...

asked by vasili111 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=11639 14 votes

answered by WReach https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=142 11 votes

2.33.1.3 Mottled appearance of ContourPlot3D with transparency

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=217226

I’m trying to make a ContourPlot3D that needs to be transparent. With transparency, however, something odd happens.

With PerformanceGoal->"Speed", the colors look fine.

With ...

asked by Peter Todd Williams https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70508 11 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 9 votes

2.33.1.4 Dividing by Zero - Unexpected Result

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=218539

When I divide this number by zero I get this for an answer. 
 
ans = 2345900/0 
 
What is surprising is that in taking the square root, Mathematica seems to map the entire universe to some town  ...

asked by MikeY https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=47314 9 votes

2.33.1.5 How can I plot a parametric equation with ś?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=217227

I want to draw a parametric equation with ś like the figure below: 
 
But I don't get the result I want when I run the following code. What can I do to get it? 
 
ParametricPlot[{x, śx^2}, {x, 0, 1}, 
   ...

asked by Please Correct GrammarMistakes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=42417 9 votes

answered by Mr.Wizard https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=121 16 votes

2.33.1.6 Mathematica numerical "error" for simple multiplication?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=217205

In[71]:= 0.6*0.8048780487804877` 
 
Out[71]= 0.482927 
 
In[72]:= 0.3*0.8414634146341463` 
 
Out[72]= 0.252439 
 
In[74]:= (0.6*0.8048780487804877`) + 0.3*0.8414634146341463` 
 
Out[74]= 0.735366 

asked by htam_ujn https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70502 9 votes

answered by m0nhawk https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2342 8 votes

2.33.1.7 Why can’t I use Inactive[D] in NDSolve?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=217169

I have a 2D rectangular domain with -L/2 < x < L/2 and 0 < y < D0, which is divided into two parts, 
with a sinusoidal curve y == 1 +  Cos[2 Pi x/L] separating the two. 
 
I want to solve  ...

asked by Physicist https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=41581 8 votes

answered by user21 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=18437 8 votes

2.33.1.8 LaTeX and Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=736

I quite often would like to draw graphics in my LaTeXdocuments using Mathematica. I have encountered three problems. I would like to know if there are any workarounds to these problems

I would ...

asked by Thomas Rot https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=227 124 votes

answered by Simon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34 45 votes

2.33.1.9 How to make a spiroglyphic?]

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=188139

Some (older) members of this group might remember playing vinyl LP records. Recently, at the Abbey Road studio there was a spiroglyphics coloring book for sale. It looks like a nice programming ...

asked by TheDoctor https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2263 13 votes

answered by b3m2a1 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=38205 18 votes

2.33.1.10 How to graph a sphere with cartesian equations?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=24169

I’m new to Mathematica and I need to ask how to graph a sphere, cylinder, etc.. using cartesian equations.

For example in sphere’s case \(x^2+y^2+z^2=1\)

I tried to use Plot3D but it doesn’t ...

asked by German https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7145 7 votes

answered by Dr. belisarius https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=193 13 votes

2.33.1.11 Mathematica Minecraft

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=19669

Some time ago I asked myself: with all these great graphics and interactive capabilities of Mathematica, what kinds of 3D games can be implemented in it? And the answer which came to mind is ...

asked by faleichik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=219 163 votes

answered by faleichik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=219 232 votes

2.33.1.12 Code that generates a mandala

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=136974

My little brother asked me to print original mandalas for coloring. I would like some idea on how to create them, but without color, so he can color them.

asked by zeros https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26849 69 votes

answered by Anton Antonov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34008 93 votes

2.33.1.13 Calling Correct Function for Plotting DiracDelta

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=3506

I am wondering what is the correct function in Mathematica to plot the true impulse function, better known as the DiracDelta[] function. When using this inside of a function or just the function ...

asked by night owl https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=116 17 votes

answered by Heike https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46 19 votes

2.33.1.14 Solving \(L=\frac {3}{2} \sqrt {4 \pi ^2 A^2+W^2}-\frac {\sqrt {5 W \sqrt {4 \pi ^2 A^2+W^2}+6 \pi ^2 A^2+3 W^2}}{\sqrt {2}}+\frac {3 W}{2}\) for \(W\)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=57763

When I solve the aforementioned equation for \(W\) or \(A\) on Mathematica I get a long and ugly equation in return, namely one of the solutions for \(W\) is: (attempt to read at your own health)

asked by J.D’Almbert ( https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19257 ) 8 votes

answered by Alexei Boulbitch ( https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=788 ) 13 votes