8.8.1 Top new questions this week

8.8.1.1 Accumulate matrix elements
8.8.1.2 How to draw a circle axis by AxisObject
8.8.1.3 How can I create accurate image masks from Graphics?
8.8.1.4 How to quickly test if two regions intercept?
8.8.1.5 Maximum of a group of overlapping circles
8.8.1.6 Exporting data from a simply generated interpolating function
8.8.1.7 "Cleverly" replace expression when simplify
8.8.1.1 Accumulate matrix elements

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264853

Consider the 'm' matrix: 
Link to 'matrix.dat':https://drive.google.com/drive/folders/1COdMCCBKq85vMDj6Jrb2qqoUlE9eTk6w?usp=sharing 
... 
[list-manipulation] [matrix] [mathematical-optimization]
 
asked by ralph https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=47286 Score of 10
answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 10
8.8.1.2 How to draw a circle axis by AxisObject

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264630

This is my current try, but I don't know why it cannot put in the right position: 
... 
[graphics] [bugs] [ticks]
 
asked by yode https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=21532 Score of 10
answered by F https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70291 Score of 11
8.8.1.3 How can I create accurate image masks from Graphics?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264814

I am looking to generate image masks using  Graphics . For this, the requirements are that: 
 
The rasterized mask must have the exact same dimensions as the image with ... 
[graphics] [bugs] [image-processing] [rasterize]
 
asked by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 Score of 8
answered by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 Score of 6
8.8.1.4 How to quickly test if two regions intercept?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264733

If I randomly generated two cylinders, how do I test if they intercept? For example: 
... 
[performance-tuning] [regions] [geometry]
 
asked by Burrawang https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=71707 Score of 6
answered by cvgmt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72111 Score of 6
8.8.1.5 Maximum of a group of overlapping circles

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264632

I am studying Huygen's principle, and I would like a way to only highlight the wavefront of an advancing wave. At the moment, I have a group of overlapping circles, but I don't know how to highlight ... 
[graphics] [regions]
 
asked by Mark B https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=49906 Score of 6
answered by cvgmt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72111 Score of 7
8.8.1.6 Exporting data from a simply generated interpolating function

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264909

The question referenced in the link here has a title that matches my question, but the discussion is very complex and does not seem to address my issue. I have solved a partial differential equation ... 
[export] [interpolation] [conversion]
 
asked by Anna Naden https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=73509 Score of 5
answered by Bob Hanlon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9362 Score of 4
8.8.1.7 "Cleverly" replace expression when simplify

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264772

I want to simplify $5a\cdot x+5b\cdot y+6 c+c^2$, if possible, given that $e=a\cdot x+b\cdot y+c$. 
I don't want to replace $c=e-a\cdot x-b\cdot y$. I want to replace it "cleverly". 
So, a ... 
[simplifying-expressions]
 
asked by Chameleon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72915 Score of 5
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 9