11.9.3 Can you answer these questions?

11.9.3.1 Dealing with mouse clicks in graphics objects that are beyond machine precision?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=311532

As a fun project with my kids, I've created a small GUI that enables us to explore the mandlebrot set.  The GUI works great as long as you stay within machine precision.  Even though the function <... 
[graphics] [arbitrary-precision]
 

asked by John https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5507 Score of 1

11.9.3.2 Simple MatrixSymbol and Solve example in 14.2

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=311426

I'm excited about the new symbolic tensor features. I'm trying to just do some simple linear algebra with the least squares regression formula for some 2D data points. 
Initializing: 
... 
[linear-algebra] [tensors]
 

asked by Michael Hale https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5568 Score of 4

11.9.3.3 How to delete rows from matrix where 2nd column contains Sqrt[n] or m*Sqrt[n] or Sqrt[n]/m etc for integer n,m

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=311456

I'm building a matrix where each row {x1,y1,x2,y2,x3,y3,...} is a potential solution. 
All the numbers are exact. The xi can be of any form. But I want to eliminate rows 
where yi contains a ... 
[pattern-matching]
 

asked by Bill https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=18890 Score of 1

answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 0