8.34.1 Top new questions this week

8.34.1.1 What's wrong with this FFT-based Von Kármán vortex street simulation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274757

About 9 years ago, I came across this interesting website, and found the following paragraph with a broken Mathematica code sample: 
When fluid passes an object, it can leave a trail of vortices ... 
[differential-equations] [fourier-analysis] [algorithm] [broken-code] [fluid-dynamics]
 

asked by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 Score of 14

answered by Daniel Huber https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46318 Score of 0

8.34.1.2 Does DSolve give a general solution?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274700

Bug introduced in 13.1 or earlier and persisting through 13.1.0 or later 
 
I have a first-order ODE that I want to solve: 
$$\frac{dy}{dt}=\frac{1}{2t}+\frac{y^2}{2}$$. 
The result I get back from 
... 
[differential-equations] [bugs]
 

asked by jms547 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=57850 Score of 11

answered by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 6

8.34.1.3 2d data set as contour

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274822

There is a set of data in the form of a table that I import into Mathematica: 
https://dropmefiles.com/7BXAE 
... 
[plotting] [graphics] [regions] [dataset]
 

asked by dtn https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=67019 Score of 6

answered by JimB https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19758 Score of 10

8.34.1.4 Code to find the similarity transformation between two matrices

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274793

For example, I know that matrices 
$$A=\left( 
\begin{array}{cccc} 
1 & 1 & 1 & 0 \\ 
-6 & -1 & 4 & -5 \\ 
12 & 0 & -5 & 5 \\ 
12 & 0 & -6 & 5 \\ 
\end{... 
[list-manipulation] [matrix]
 

asked by Daniel Checa https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=87196 Score of 6

answered by yode https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=21532 Score of 6

8.34.1.5 Sort symbols or characters by image complexity

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274796

As an example, I would like to sort the following characters by some sort of complexity measure: 
... 
[image-processing] [geometry] [machine-learning] [fourier-analysis]
 

asked by userrandrand https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=86543 Score of 5

answered by userrandrand https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=86543 Score of 6

8.34.1.6 List of large cities in Pakistan

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274789

Bug introduced in 12.2.0 or earlier and persisting through 13.1.0 
I am using v12.2.0-Win7-x64. 
I have been experimenting with  Geo*  command syntaxes and came across ... 
[bugs] [curated-data] [geography] [geographics] [entity]
 

asked by Syed https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81355 Score of 5

answered by Greg Hurst https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4346 Score of 5

8.34.1.7 NDSolve with one initial condition and one terminal condition

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=274782

I have been trying to solve two coupled first-order differential equations. For one of those two equations, the initial condition is known and for the other one, the terminal condition is known. ... 
[differential-equations]
 

asked by PoreyS https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=54258 Score of 5

answered by Hans Olo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61267 Score of 5