2.30 Thursday, April 23, 2020

2.30.1 Top new questions this week
2.30.2 Greatest hits from previous weeks
2.30.3 Can you answer these questions?

2.30.1 Top new questions this week

Wrong function of NotebookDirectory[] in the 12.1 version
How complete is the WL’s string language?
Reusing PARDISO symbolic factorization
How to Improve FEM Solution with NDSolve?
What is the difference between Wolfram Script and Wolfram Engine?
Implicit Riccati Equation Solver (to find the anti-stabilizing solution
Dates not printed in DateListPlot

Wrong function of NotebookDirectory[] in the 12.1 version

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219700

Bug introduced in 12.1.0

Could anybody help?

NotebookDirectory[] function began working wrong in 12.1 (the bug was not present in 12.0 and earlier versions).

When folder name includes Russian ...

asked by Alexander https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72011 13 votes

answered by ilian https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=145 10 votes

How complete is the WL’s string language?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=220003

Consider the following example:

Suppose I am interested in words that contain all the letter of the list 
characters={"e","t","l","a","b"} at least once. An example would be 
the word "abilities" or a  ...

asked by user13892 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13892 12 votes

answered by Jason B. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9490 11 votes

Reusing PARDISO symbolic factorization

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219687

Is there a way to do this natively in Mathematica? I read in several places that this is possible with LibraryLink, but I don’t have a lot of experience with C and so I’m having trouble implementing ...

asked by beets https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72007 8 votes

answered by Henrik Schumacher https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=38178 13 votes

How to Improve FEM Solution with NDSolve?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219990

First some comments. This same calculation works beautifully in 2D with essentially the same code. I have copied it largely unaltered into 3D as part of a migration to 3D so that I can do more complex ...

asked by Paul Harrison https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=69377 7 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 8 votes

What is the difference between Wolfram Script and Wolfram Engine?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219963

I don’t understand the difference between these products:

Wolfram Script

Wolfram Engine

Would someone help me understand what these are? And how it differs from just using Mathematica in the ...

asked by QuantumDot https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2048 6 votes

answered by morbo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=48686 0 votes

Implicit Riccati Equation Solver (to find the anti-stabilizing solution

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219758

I’ve found that the latest MATLAB icare() solver includes the possibility to find also the anti-stabilizing solution of the Riccati equation. I haven’t found a similar option on Mathematica. Is there ...

asked by Mirko Aveta https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36621 6 votes

answered by Suba Thomas https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5998 5 votes

Dates not printed in DateListPlot

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=220154

A simple example

Clear["Global`*"]; 
 
data = TimeSeries[{1, 2, 1, 3, 0, 0, 0, 2, 21, 15, 21, 7, 11, 5, 10, 
       18, 73, 38, 103, 21, 35, 31, 46, 31, 35, 94, 71, 48, 78, 71, 74, 
       95, 95, 56,  ...

asked by Vaggelis_Z https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5052 5 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 1 vote

2.30.2 Greatest hits from previous weeks

Mathematica code for Bifurcation Diagram
Drawing a square root spiral
How do I draw a pair of buttocks?
How can I improve Mathematica’s resolution on a macbook retina display?
Using Export[] sends the file where?
How to create effect like Van Gogh’s stroke brush?
Elegant operations on matrix rows and columns

Mathematica code for Bifurcation Diagram

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=13277

At the moment I am trying to construct a bifurcation diagram of the iterative function \(f(x)=\) \(ax-1.1975x^3\). I’ve scoured the internet for pre-made bifurcation diagrams and found many (mostly of the ...

asked by Mel https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=3249 26 votes

answered by Mark McClure https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36 45 votes

Drawing a square root spiral

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=66969

Here is a start. I’m looking for a nice way to draw it.

Graphics[{EdgeForm[Black], White, 
  Polygon @ {{0, 0}, {-1, 0}, 
    Sqrt[2] {Cos[#], Sin[#]} &[Pi - (ArcCot[1])]}, 
  Polygon @ {{0,  ...

asked by matrix89 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5379 24 votes

answered by Bob Hanlon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9362 21 votes

How do I draw a pair of buttocks?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=66538

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 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=22399 287 votes

answered by mikuszefski https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7608 440 votes

How can I improve Mathematica’s resolution on a macbook retina display?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=18419

Mathematica 9.0 looks a bit fuzzy on the retina screen, how can I increase the resolution?

Here another screenshot showing a direct comparison between the browser and Mathematica

asked by Tom Wellington https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2437 43 votes

answered by canadian_historian https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19 20 votes

Using Export[] sends the file where?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=8586

I am trying to use the Export command to convert a list of plots into a *.gif file, and the command runs and executes well, but I can’t find the file! Where is it supposed to go? Did it even work?

asked by Patrick Da Silva https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1785 37 votes

answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 49 votes

How to create effect like Van Gogh’s stroke brush?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=39003

I need to apply Van Gogh’s stroke brush effect to a random image

Take the following image as an example:

Thank you so much if you could help!

asked by user10495 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=10495 33 votes

answered by Simon Woods https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=862 51 votes

Elegant operations on matrix rows and columns

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=3069 Question

The Mathematica tutorial has a section ’Basic Matrix Operations’, describing operations like transpose, inverse and determinant. These operations all work on entire matrices. I am missing a ...

asked by sjdh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=515 177 votes

answered by Mr.Wizard https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=121 60 votes

2.30.3 Can you answer these questions?

Can one use .wls (script) files in a simple way, like Matlab scripts?
Introduction to Probability
Do palettes limit the execution time of a user-defined function?

Can one use .wls (script) files in a simple way, like Matlab scripts?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219919

I have been fighting unsucessfully with the intricacies of creating Mathematica packages (Private, scopes , context) for a long time. I just need a simple version of Matlab scripts, to be able to ...

asked by florin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=54979 1 vote

Introduction to Probability

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219883

Is there any newer book or online resource that would be good introductory text to probability with Mathematica? I have Introduction to Probability with Mathematica by Hastings but it is over 10 years ...

asked by grga https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70392 1 vote

Do palettes limit the execution time of a user-defined function?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=219973

I have defined a function ConvertToMarkdown that does some long processing of a notebook: converts it to markdown, save inputs/outputs as images, generates a word cloud etc., that can take multiple ...

asked by Victor K. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1351 1 vote