10.15.1 Top new questions this week

10.15.1.1 Can we reproduce Antonio Asis circle interferences?
10.15.1.2 Calculating relative error of Ramanujan formula for ellipse perimeter
10.15.1.3 Convert Mathematica formulas to Julia
10.15.1.4 Syntax error when running file created with Save which contains backslashes
10.15.1.5 How to obtain this solution to this nonlinear IVP second order ode?
10.15.1.6 How to build a symmetric matrix of up to 100?
10.15.1.7 Find permutation that satisfies conditions
10.15.1.1 Can we reproduce Antonio Asis circle interferences?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302828

Antonio Asis 
Antonio Asis (1932 - 2019) was an Argentine artist and one of the main exponents of kinetic art and op art. Asis was born in Buenos Aires. At the age of 14 he enrolled at the National ... 
[plotting] [graphics] [computational-geometry] [generative-art]
 
asked by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 16
answered by yarchik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9469 Score of 13
10.15.1.2 Calculating relative error of Ramanujan formula for ellipse perimeter

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302916

On this page, they present the Ramajujan's second formula for the perimeter of an ellipse: 
$$P \approx \pi  (a+b) \left(1+ \frac{3 h}{\sqrt{4-3 h}+10}\right),$$ 
where $h=(a-b)^2/(a+b)^2$. They expand ... 
[calculus-and-analysis] [series-expansion] [approximation] [ellipse]
 
asked by Ytrewq https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85051 Score of 9
answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 10
10.15.1.3 Convert Mathematica formulas to Julia

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302862

Is there a package converting mathematica output expressions to Julia ? 
I know from an other answer in the forum that there is the corresponding ToMatLab(Is it possible to export the equations from ... 
[export] [julia]
 
asked by JTT https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=98678 Score of 8
answered by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 5
10.15.1.4 Syntax error when running file created with Save which contains backslashes

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302893

I am doing a nested integration. So far the result was successfully saved with  Save["filename.wl", IntOutput]  and looked as following: 
... 
[output-formatting] [syntax] [formatting] [save]
 
asked by seva011 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=92499 Score of 5
answered by Domen https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=75628 Score of 1
10.15.1.5 How to obtain this solution to this nonlinear IVP second order ode?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302939

This problem from Ordinary Differential Equations, By Tenenbaum and Pollard. Dover, NY 1963, Chapter 8. Special second order equations. Lesson 35. Independent variable x absent, Exercise 35.18, page ... 
[differential-equations]
 
asked by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 5
answered by Goofy https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46569 Score of 5
10.15.1.6 How to build a symmetric matrix of up to 100?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302929

I have a square matrix of 100 elements in the form: 
A = {{a^0, a^1, a^2, a^3,...,a^99}, {a^1, a^0, a^1, a^2,...,a^98}, {a^2, a^1, a^0, a^1,...,a^97}, {a^3, a^2, a^1,a^0,...,a^96}...{a^99,a^98,...,a^2,... 
[matrix]
 
asked by Edinardo Rodrigues https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=98762 Score of 5
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 8
10.15.1.7 Find permutation that satisfies conditions

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=302885

Suppose you what to find a permutation of integers  {1, 2, ..., 13}  that satisfy some rules. 
Rules can be found in variable  rules .... 
[list-manipulation] [combinatorics] [permutation]
 
asked by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 5
answered by Najib Idrissi https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85027 Score of 6