6.1.3 Can you answer these questions?

6.1.3.1 UnitSimplify rules?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=217164

Code as following: 
 
In[1]:= constants = Quantity /@ {"PlanckConstant", "BoltzmannConstant", "MolarGasConstant"}; 
Print[UnitSimplify[ 
UnitConvert[Quantity["AvogadroNumber"]*constants[[2]]]] // N]; 
... 
[units]
 

asked by  https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19360 1 vote

6.1.3.2 How to delete random elements with RandomChoice?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=218431

I have a list of prices and a list of dates, but I have 154 more prices than dates. So I want to delete random prices to match both lists, however, every time I run the block of code I get a different  ... 
[list-manipulation] [error]
 

asked by trashparticle https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=71573 1 vote

6.1.3.3 settings elements of matrix of functions

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=218297

I have a work flow that involves initially specifying a matrix function (or a matrix of functions), e.g. 
 
f[x_]:={{Exp[x],Sin[x]},{Cos[x],Log[x]}} 
 
This works well for what I am using it for. I can  ... 
[functions] [matrix]
 

asked by user3353819 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34650 1 vote