6.7.2 Greatest hits from previous weeks

6.7.2.1 Help find a bright object on Mars!

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=11819

In today's news, scientists found a bright object on one of Curiosity's photos (it's near the bottom of the picture below). It's a bit tricky to find - I actually spent quite some time staring at the  ... 
[image-processing]
 

asked by Victor K. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1351 197 votes

answered by Niki Estner https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=242 255 votes

6.7.2.2 Figuring when the minute and hour hand coincide on a clock

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=573

I would like to list all possible times in a 12-hour period, where the hour hand overlaps the minute hand completely.  This is really a question about three distinct things - to be done in Mathematica  ... 
[equation-solving]
 

asked by Steve D https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=191 15 votes

answered by Verbeia https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=8 21 votes

6.7.2.3 How to perform a multi-peak fitting?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=26336

I am wondering how to implement the multi-peak detecting and fitting in Mathematica. Following is an example of fitting the data using three peaks (such that the data ~ peak1 + peak2 + peak3). 
 
 
 
The  ... 
[fitting] [data] [peak-detection]
 

asked by Everett You https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1389 54 votes

answered by Silvia https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=17 54 votes

6.7.2.4 Using Export[] sends the file where?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=8586

I am trying to use the Export command to convert a list of plots into a *.gif file, and the command runs and executes well, but I can't find the file! Where is it supposed to go? Did it even work? 
 
... 
[export]
 

asked by Patrick Da Silva https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1785 37 votes

answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 49 votes

6.7.2.5 Can Mathematica do symbolic linear algebra?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=3242

For instance, is there some way I can say "let A and B be arbitrary real $m\times n$ and $k\times m$ matrices, Simplify[Transpose[Transpose[A].Transpose[B]]]" and Mathematica would simplify it to B.A? 
... 
[linear-algebra] [symbolic]
 

asked by Niki Estner https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=242 61 votes

6.7.2.6 Assign the results from a Solve to variable(s)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=6669

I understand Mathematica can't assign the results of a Solve to the unknowns because there may be more than 1 solution. How can I assign the 4 values of following result to variables? 
 
 
 
Solve[y^2 ==  ... 
[equation-solving] [assignment] [faq]
 

asked by stevenvh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1450 52 votes

answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 33 votes

6.7.2.7 Creating a table/Matrix during a For loop

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=2930

I have a For loop (with i as a counter), which calculates different values (y1, y2, y3,...) as a function of the variable x. 
How can I create a table/matrix which contains i lines, each line  ... 
[matrix]
 

asked by Solarboy https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=727 10 votes

answered by Mr.Wizard https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=121 14 votes