2.5.1 Top new questions this week

2.5.1.1 New behavior of PlotRange in Mathematica 10

http://mathematica.stackexchange.com/questions/87808/new-behavior-of-plotrange-in-mathematica-10

 
In Mathematica 10, when I plot data that has small changes around some non-zero value, the plot chooses a PlotRange that "collapses" the data so that the variations cannot be seen.  The only way I can  ...
 

- asked by Greg Cook (17 votes), answered by Mr.Wizard (13 votes)

2.5.1.2 Simple Matrix multiplication takes very long

http://mathematica.stackexchange.com/questions/87857/simple-matrix-multiplication-takes-very-long

 
Bug introduced in 10.1.0 
 
 
 
I came across some strange behaviour during a computation involving matrices with symbolic values. It is reproduced below. 
 
Multiplying a random 30x30 array with symbolic  ...
 

- asked by A. Roy 14votes

2.5.1.3 Why does leaving and re-entering a context lose values defined in that context?

http://mathematica.stackexchange.com/questions/88147/why-does-leaving-and-re-entering-a-context-lose-values-defined-in-that-context

 
I'm getting unexpected behavior when beginning a new context, leaving it, and then re-entering it. Specifically, when re-entering the context, symbols that had been previously defined in that context  ...
 

- asked by ibeatty (12 votes), answered by Simon Rochester (13 votes)

2.5.1.4 Use of Key to extract a key value in Associations not working in V10.1

http://mathematica.stackexchange.com/questions/88034/use-of-key-to-extract-a-key-value-in-associations-not-working-in-v10-1

 
V10.1: 
 
<|a -> 1|>[Key @ a] 
(* Missing["KeyAbsent", Key[a]]*) 
 
 
V10.0: 
 
<|a -> 1|>[Key @ a] 
(* 1 *) 
 
 
Bug or Design Change?
 

- asked by Ronald Monson (11 votes), answered by Szabolcs (8 votes)

2.5.1.5 Using Mathematica to solve a probability problem

http://mathematica.stackexchange.com/questions/88178/using-mathematica-to-solve-a-probability-problem

 
The problem is from Principles of Statistics by M.G. Bulmer: 
 
 
In a certain survey of the work of chemical research workers, it was found, on the basis of extensive data, that on average each man  ...
 

- asked by billc (10 votes), answered by ciao (11 votes)

2.5.1.6 What does this message mean and how serious is it?

http://mathematica.stackexchange.com/questions/87891/what-does-this-message-mean-and-how-serious-is-it

 
I had some Mathematica files on over which recently I have faced to this message: 
 
 
 
However, after searching, I have seen some blogs in Mathematica SE or in somewhere else about that, but I could not  ...
 

- asked by mr.0093 (9 votes), answered by Mr.Wizard (17 votes)

2.5.1.7 Remove static objects from an image sequence

http://mathematica.stackexchange.com/questions/87901/remove-static-objects-from-an-image-sequence

 
Is it possible to remove static objects/pixels from a sequence of images? 
 
Lets say I have a black square in the middle of my white picture (white background) and a black circle is orbiting around it.  ...
 

- asked by PH13 (9 votes), answered by Pickett (6 votes)