4.24.1 Top new questions this week

4.24.1.1 Good references for parallel programming in Mathematica

https://mathematica.stackexchange.com/questions/148489/good-references-for-parallel-programming-in-mathematica

 
There are plenty of good references for all sorts of Mathematica programming: 
 
 
This forum is a great example for specific questions/"getting things done". 
Books like those by R.Maeder (esp. the now  ...
 

- asked by Gaius 17votes

4.24.1.2 Dot not well-defined: are there better examples?

https://mathematica.stackexchange.com/questions/148465/dot-not-well-defined-are-there-better-examples

 
Dot is not "well-defined" in Mathematica - we cannot simultaneously have it being associative and working with 1D and 2D arrays.  For example, the order we substitute for variables should not change  ...
 

- asked by mikado (10 votes), answered by Shadowray (9 votes)

4.24.1.3 Internal`Bag memory usage

https://mathematica.stackexchange.com/questions/148594/internalbag-memory-usage

 
1. How does Internal`Bag handle memory inside a compiled function? (examples below) 
 
2. Is there a way to explicitly free up memory used by Internal`Bag without exiting the function? 
 
Preface: The  ...
 

- asked by aardvark2012 9votes

4.24.1.4 Preventing an unwanted vertical line from appearing my plot

https://mathematica.stackexchange.com/questions/148502/preventing-an-unwanted-vertical-line-from-appearing-my-plot

 
How can I eliminate (remove) the unwanted vertical line x = 1 when I make the plot shown below. 
 
p3 = 
Plot[ 
{0.5/(-0.1 x + 0.1), 
0.04/(-0.004 x + 0.004), 
1.359/(-0.08 x + 0.08), 
...
 

- asked by Irreversible (9 votes), answered by m_goldberg (1 vote)

4.24.1.5 Integer to Alpha Representation

https://mathematica.stackexchange.com/questions/148446/integer-to-alpha-representation

 
I wanted a nice way to convert natural numbers to alphabetic representations like: 
 
1->"A", 
2->"B", 
... 
26->"Z", 
27->"AA, 
... 
26*2->"AZ", 
26*2+1->"BA", 
... 
 
 
And I knew this was  ...
 

- asked by b3m2a1 (8 votes), answered by Carl Woll (6 votes)

4.24.1.6 How to display numbers as multiples of a square root

https://mathematica.stackexchange.com/questions/148551/how-to-display-numbers-as-multiples-of-a-square-root

 
The extension field $\mathbb{Q}(\sqrt {2} + \sqrt {3})$ can be represented by a $4$ - dimensional vector space over $\mathbb{Q}$ with basis $\{1, \sqrt {2}, \sqrt {3}, \sqrt {6}\} $. 
 
I made a matrix  ...
 

- asked by nilo de roock (8 votes), answered by Carl Woll (7 votes)

4.24.1.7 Visually permute rows of a matrix via mouse dragging

https://mathematica.stackexchange.com/questions/148448/visually-permute-rows-of-a-matrix-via-mouse-dragging

 
I'm looking for a way to permute the rows of a matrix visually via mouse dragging, for example by clicking and dragging on a row in the MatrixPlot corresponding to the matrix. 
 
What would be the best  ...
 

- asked by glS (8 votes), answered by glS (10 votes)