9.22.1 Top new questions this week

9.22.1.1 Strange behaviour of an association
9.22.1.2 Why can't NSolve solve for the obvious zeros?
9.22.1.3 VectorPlot "Part 1 of    does not exist" error
9.22.1.4 Visualizing density given by its Stieltjes transformation?
9.22.1.5 How to calculate the circumference of a graph?
9.22.1.6 Efficient way for writing -1 <= X[i,j] <=1
9.22.1.7 RegionDifference imperfection
9.22.1.1 Strange behaviour of an association

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286995

This an almost MWE of a problem I encountered when working with associations. 
 asc1 = <| |>; 
asc1[1] = Range[0, 9]; 
asc1[2] = Range[0, 9]; 
asc1 
 
Out[150]= <|... 
[bugs] [associations]
 
asked by Fred Simons https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=20253 Score of 12
answered by Sjoerd Smit https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=43522 Score of 14
9.22.1.2 Why can't NSolve solve for the obvious zeros?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286855

Bug introduced in 13.2 or earlier and persisting through 13.2.1 or later 
 
... 
[equation-solving] [bugs] [special-functions]
 
asked by Vancheers https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85926 Score of 7
answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 Score of 6
9.22.1.3 VectorPlot "Part 1 of    does not exist" error

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286918

Bug introduced in 7.0, persisting through 13.2. 
 
I am looking to plot the Magnetic Vector potential, A, as a function of position along the edge of a density plot.  The density plot is fine, and I ... 
[plotting] [bugs] [warning-messages] [discontinuity]
 
asked by Jack Adams https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=42467 Score of 7
answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 Score of 5
9.22.1.4 Visualizing density given by its Stieltjes transformation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286914

How can I use Mathematica to get $f(y)$, the PDF of a random variable given its Stieltjes transform $g(s)$? 
$$g(s)=E\left[1/(s-X)\right]$$ 
I need to visualize probability density of a random variable  ... 
[calculus-and-analysis] [probability-or-statistics] [visualization]
 
asked by Yaroslav Bulatov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=217 Score of 5
answered by JimB https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19758 Score of 3
9.22.1.5 How to calculate the circumference of a graph?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286881

The circumference of a graph is the length of any longest cycle in the graph. I couldn't find a specific command to calculate the circumference of a graph or find a longest cycles. Using ... 
[graphs-and-networks]
 
asked by licheng https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=67902 Score of 5
9.22.1.6 Efficient way for writing -1 <= X[i,j] <=1

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286882

I have an $m \times n$ variable $X$. I want to write the following constraint 
... 
[list-manipulation]
 
asked by Morcus https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=77718 Score of 5
answered by ydd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72953 Score of 6
9.22.1.7 RegionDifference imperfection

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=286874

Consider the following two regions: 
... 
[regions] [syntax] [geometry] [mesh]
 
asked by John Taylor https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=41058 Score of 5
answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 8