4.45.1 Top new questions this week

4.45.1.1 Is it possible to construct a fullform trace function

https://mathematica.stackexchange.com/questions/160184/is-it-possible-to-construct-a-fullform-trace-function

 
Is it possible to construct a FullFormTrace function that takes an arbitrary expression and prints a sequence  (or returns a list) of the evaluation steps in full form. For instance 
 
...
 

- asked by Bob Ueland (13 votes), answered by Edmund (15 votes)

4.45.1.2 Integrate gives wrong result for simple function

https://mathematica.stackexchange.com/questions/160278/integrate-gives-wrong-result-for-simple-function

 
(probably) Bug introduced in 9.0 or earlier and persisting through 11.2 
 
 
 
It looks like this. 
 
NIntegrate[1/(2 + Sin[x + y]), {x, 0, 2 Pi}, {y, 0, 2 Pi}] 
22.7929 
Integrate[1/(2 + Sin[x + y]), {x, 0,  ...
 

- asked by huotuichang (10 votes), answered by Nasser (8 votes)

4.45.1.3 Select the same elements from lists

https://mathematica.stackexchange.com/questions/160222/select-the-same-elements-from-lists

 
I need a special intersectant operation for List other than Set. 
 
There maybe some duplicate elements, also need to count instead of merging as Intersection. 
 
For example: 
 
...
 

- asked by GalAster (10 votes), answered by jjc385 (11 votes)

4.45.1.4 Building a convenient package distribution system

https://mathematica.stackexchange.com/questions/160330/building-a-convenient-package-distribution-system

 
The PacletManager is nice, but it's not really a low-effort system to work with. 
 
Installing a package can be made pretty easy, but only if the location from which it is to be installed makes it so. 
 
...
 

- asked by b3m2a1 8votes

4.45.1.5 How to merge two lists with different dimensions

https://mathematica.stackexchange.com/questions/160159/how-to-merge-two-lists-with-different-dimensions

 
I have two list, just like 
 
a={a1,a2,a3,a4}; 
b={b1,b2,b3,b4,b5}; 
 
 
I want merge them and save to excel, as they have different dimention, so I want it have the following format. 
 
...
 

- asked by zongxian (7 votes), answered by Carl Woll (12 votes)

4.45.1.6 What is the elegant way of applying function to two lists?

https://mathematica.stackexchange.com/questions/160028/what-is-the-elegant-way-of-applying-function-to-two-lists

 
I am interested in finding the most concise elegant way of doing the following: 
We have a function fun[x1,x2] 
and two lists: 
 
ls1={a1,a2,a3,a4,......} 
 
 
and 
 
ls2={b1,b2,b3,b4,......} 
 
 
I  ...
 

- asked by qahtah (7 votes), answered by halirutan (11 votes)

4.45.1.7 Legend displaying the expected number of points per unit area next to density plot

https://mathematica.stackexchange.com/questions/160193/legend-displaying-the-expected-number-of-points-per-unit-area-next-to-density-pl

 
I have 2d points and want to show a colored density plot of them. I also want to display a legend showing which point density (number of points per unit area) the colors in the plot represent. 
 
Let's  ...
 

- asked by mrz (6 votes), answered by C. E. (7 votes)