1.7.1 Top new questions this week

1.7.1.1 Total much slower in version 10

http://mathematica.stackexchange.com/questions/63209/total-much-slower-in-version-10

 
Compilation nowadays may give very fast functions. Here is an example 
for finding the sum of a list of machine numbers, just as the built-in 
function Total: 
 
myTotal =   Compile[{{lst, _Real, 1}}, 
...
 

- asked by Fred Simons (15 votes), answered by Karsten 7. (5 votes)

1.7.1.2 Drawing the schematic diagram of algorithm

http://mathematica.stackexchange.com/questions/63471/drawing-the-schematic-diagram-of-algorithm

 
The B-Spline function used the alogrithm as shown below: 
 
I would like to draw it in Mathematica (Although this is my first time 
to use TreePlot) 
 
TreePlot[ 
{1 -> 2, 1 -> 3, 2 -> 4,  ...
 

- asked by ShutaoTang (14 votes), answered by kguler (9 votes)

1.7.1.3 How can I evaluate only a single step of a recursive function?

http://mathematica.stackexchange.com/questions/63256/how-can-i-evaluate-only-a-single-step-of-a-recursive-function

 
Let's say have a simple recursive function for the Fibonacci sequence 
 
f[0] := 1 
f[1] := 1 
f[n_] := f[n - 1] + f[n - 2] 
 
 
but I want to see how it will expand in a given number of steps, but not 
all  ...
 

- asked by Jakub Arnold (12 votes), answered by Daniel Lichtblau (16 votes)

1.7.1.4 How to build a 3D graph from a 3D matrix?

http://mathematica.stackexchange.com/questions/63428/how-to-build-a-3d-graph-from-a-3d-matrix

 
Following this 
and that question 
and the corresponding answers, Mathematica can build 2D graph from 2D 
matrices. 
 
 
 
Question 
 
 
How to make the corresponding 3D graphs from 3D cubes? 
 
 
Attempt 
 
...
 

- asked by chris (11 votes), answered by kguler (5 votes)

1.7.1.5 Listable functions thread over Associations; is this documented?

http://mathematica.stackexchange.com/questions/63293/listable-functions-thread-over-associations-is-this-documented

 
Thanks to a somewhat misapplied use of MapThread I learned of this 
behavior: 
 
<|a -> 1, b -> 2|> + <|a -> 5, b -> 6|> 
 
 
 
<|a -> 6, b -> 8|> 
 
 
 
Furthermore this  ...
 

- asked by Mr.Wizard (10 votes), answered by m_goldberg (3 votes)

1.7.1.6 Bug(?) in version 10: Tooltip and ListPointPlot3D

http://mathematica.stackexchange.com/questions/63667/bug-in-version-10-tooltip-and-listpointplot3d

 
Bug introduced in 10.0.0 
 
 
 
The coordinates of a point in a three dimensional graph can be shown in 
a tooltip: 
 
ListPointPlot3D[Tooltip[RandomReal[{0, 1}, {50, 3}]], PlotStyle -> 
{PointSize[.02]}] 
 
...
 

- asked by Fred Simons 9votes

1.7.1.7 How to align rotated BarChart labels?

http://mathematica.stackexchange.com/questions/63263/how-to-align-rotated-barchart-labels

 
I'd like to use long text labels for a simple BarChart, but when I apply 
a rotation to label strings with different lengths the end of the text 
is no longer aligned with the bars in the chart: 
 
...
                                                                                  

                                                                                  
 

- asked by dionys (9 votes), answered by Brett Champion (10 votes)