7.5.3 Can you answer these questions?

7.5.3.1 RegionPlot of the Maximum of a function

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=239047

For the function  fun[a_, b_, x_, y_] = Sin[a x] Cos[b y] (a x + b y); corresponding to $x$ and $y$, I need a RegionPlot showing the maximum of function $fun[a, b, x, ... 
[plotting] [mathematical-optimization]
 

asked by Mike https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=76947 1 vote

answered by Bob Hanlon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9362 0 votes

7.5.3.2 How to let Mathematica evaluate a large amount of data

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=239107

I have the following code in mathematica which runs perfectly for a small matrix of 21 x 12 matrix. But I really want to test it for a large system. My data is 35844 x 21000 elements, totaling 1.5 GB. ... 
[matrix] [import] [linear-algebra]
 

asked by shixx597_Min https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=59772 1 vote

7.5.3.3 Directed Infinity vs Indeterminant in this output

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=239335

When I evaluate 
... 
[calculus-and-analysis] [simplifying-expressions] [version-12.1]
 

asked by user824530 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=75136 1 vote