9.36.1 Top new questions this week

9.36.1.1 Efficiently Mowing Grass with Mathematica
9.36.1.2 How do you achieve this optical illusion of a picture?
9.36.1.3 Why part works much slower on modified list?
9.36.1.4 Find a certain path through a matrix
9.36.1.5 Subdivide a sequence
9.36.1.6 Calculating upper culmination of the Moon
9.36.1.7 How to remove this white background for text in RegionPlot
9.36.1.1 Efficiently Mowing Grass with Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291951

Recently, I was mowing my yard and was thinking about how to use the least amount of time/fuel and how to simulate. 
Mowing a yard that is shaped as a convex polygon is not difficult, you can just make ... 
[mathematical-optimization] [image-processing] [computational-geometry] [animation] [simulation]
 
asked by Teg Louis https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=89848 Score of 12
answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 Score of 11
9.36.1.2 How do you achieve this optical illusion of a picture?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291792

In MSE by a similar problem about the optical illusion, but I feel that the solution ideas of other problems can not be applied to the following diagram, I would like to ask you how to draw this kind ... 
[graphics]
 
asked by Abel https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=94854 Score of 10
answered by Olaf Rogalsky https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=94963 Score of 20
9.36.1.3 Why part works much slower on modified list?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291978

Consider the following list: 
 tabb = RandomReal[{0.0000001, 10^5}, {10^6, 80}]; 
 
I want to extract, e.g., the columns from 1 to 20. It is reasonably fast: 
... 
[list-manipulation] [performance-tuning]
 
asked by John Taylor https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=41058 Score of 6
answered by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 7
9.36.1.4 Find a certain path through a matrix

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291874

I would like to get a functional solution and nice display form for the following problem: 
1. Example data 
... 
[list-manipulation] [matrix] [graphs-and-networks]
 
asked by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 6
answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 8
9.36.1.5 Subdivide a sequence

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291976

Yesterday I couldn't solve a problem which seemed to be rather simple. I tried  RepleaceRepeated ,  SequenceReplace  and similar ... 
[list-manipulation] [functional-style] [sequence]
 
asked by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 5
answered by lericr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=84894 Score of 4
9.36.1.6 Calculating upper culmination of the Moon

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291855

Im completely confused by the new astronomical data system in Mathematica. For every day in some interval, I want to calculate 
 {azimuth, altitude}  of the Moon in ... 
[time-series] [entity] [astronomy]
 
asked by lesobrod https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5950 Score of 4
answered by creidhne https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=41569 Score of 2
9.36.1.7 How to remove this white background for text in RegionPlot

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291769

In regionplot, How to remove this  white background for text 
 
... 
[regions] [regionplot]
 
asked by Chin Ching CHAN https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=87041 Score of 4
answered by Kumar Gaurav Sagar https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85216 Score of 1