4.4.1 Top new questions this week

4.4.1.1 My Girlfriend is going to prison...Save her with Math

http://mathematica.stackexchange.com/questions/135937/my-girlfriend-is-going-to-prison-save-her-with-math

 
Salacious title, but true story. 
 
dmethyl1 = { 
{0, 0}, 
{.25, 1}, 
{.5, 7}, 
{1, 26}, 
{1.5, 40}, 
{2, 45}, 
{2.5, 45}, 
{3, 44}, 
{3.5, 44}, 
{4,  ...
 

- asked by Prisoners Dilema (35 votes), answered by bobthechemist (22 votes)

4.4.1.2 How to use the iterator in Mathematica

http://mathematica.stackexchange.com/questions/135916/how-to-use-the-iterator-in-mathematica

 
I find the Mathematica has the iterator data structure. We can build some iterators like this: 
 
Constant iterator 
 
GeneralUtilities`ConstantIterator[5] 
 
 
 
 
Key value iterator 
 
...
 

- asked by yode (15 votes), answered by Michael E2 (15 votes)

4.4.1.3 SquaresR memory leak?

http://mathematica.stackexchange.com/questions/135781/squaresr-memory-leak

 
I have tried the following code in Mathematica 11.0.1.0 on my MacBook: 
 
$HistoryLength = 0; 
ClearAll["Global`*"]; 
ClearSystemCache[]; 
MemoryInUse[] 
 
AbsoluteTiming[Do[SquaresR[2, i], {i, 1000000}];] 
 
...
 

- asked by outofmemory (12 votes), answered by Mr.Wizard (18 votes)

4.4.1.4 SetOptions locally?

http://mathematica.stackexchange.com/questions/136005/setoptions-locally

 
Is there a way to SetOptions locally? For example, I have a Module and inside it I am doing a lot of Plots with similar options. If I do a SetOptions[Plot, ...] inside the Module, the change  ...
 

- asked by becko (11 votes), answered by J. M. (12 votes)

4.4.1.5 Understanding simple numerical calculation

http://mathematica.stackexchange.com/questions/135636/understanding-simple-numerical-calculation

 
I am trying to understand why N[0.1]//FullForm returns 0.1' (A). 
Indeed, $0.1$ in base two is $0.000110011001100110011...$. If I truncate this number to the first 52 digits and convert it back to base  ...
 

- asked by anderstood (11 votes), answered by Michael E2 (18 votes)

4.4.1.6 How to work with Date calculations?

http://mathematica.stackexchange.com/questions/135713/how-to-work-with-date-calculations

 
I have never worked using the DateObject function 
 
But I suspect there must be a (easy) way of doing it. 
 
I want to find out, when in the future, from which point, that the cumulative days of not  ...
 

- asked by Chen Stats Yu (10 votes), answered by Simon Woods (12 votes)

4.4.1.7 How to riffle matrices

http://mathematica.stackexchange.com/questions/135848/how-to-riffle-matrices

 
I have four matrices 
 
m = {{M11, M12, M13}, {M21, M22, M23}, {M31, M32, M33}}; 
n = {{N11, N12, N13}, {N21, N22, N23}, {N31, N32, N33}}; 
p = {{P11, P12, P13}, {P21, P22, P23}, {P31, P32, P33}}; 
q =  ...
 

- asked by Kowalski (8 votes), answered by Carl Woll (11 votes)