================================== Top new questions this week: ================================== [Programming paradigm change]\url{http://mathematica.stackexchange.com/questions/45829/programmin g-paradigm-change} I'm new to Mathematica, I've been learning by myself, and, being a Java developer for some time, it makes it hard to adapt. I've tried to solve a Reddit challenge, and I came up with this solution: ... - asked by MHero (20 votes), answered by WReach (30 votes) ---------------------------- [C Code generated from Mathematica not working?]\url{http://mathematica.stackexchange.com/questions/45619/c-code-g enerated-from-mathematica-not-working} I am a .Net developer. I'm trying to build a Visual C++ application using C code generated from Mathematica (by another person). I don't have Mathematica installed on my machine. When I try to compile ... - asked by pag (10 votes) ---------------------------- [What kind of check does DirectoryQ exactly perform?]\url{http://mathematica.stackexchange.com/questions/45793/what-kin d-of-check-does-directoryq-exactly-perform} I'm using Mathematica 9.0.1 on Windows XP and my drive letters are assigned as follows: C: and D: are hard local disks, while E: is assigned to some removable media. Now, the situation is as follows ... - asked by mitochondrial (9 votes), answered by librik (12 votes) ---------------------------- [What is the most efficient way to map a linked list?]\url{http://mathematica.stackexchange.com/questions/45593/what-is-the -most-efficient-way-to-map-a-linked-list} In order to work with lists effectively using common recursive patterns from functional programming, it's often most convenient to worked with the "linked list" representation, that looks like this: ... - asked by Pillsy (8 votes), answered by Leonid Shifrin (9 votes) ---------------------------- [How to protect functions in a Mathematica Package?]\url{http://mathematica.stackexchange.com/questions/45773/how-to-p rotect-functions-in-a-mathematica-package} I'm writing a Mathematica Package with many functions, but only two can be seen/public. I have: BeginPackage["VolumeReserves`"]; startInterface::usage = "..."; detailRock::usage = "..."; (* ... - asked by Lory Lory (8 votes), answered by halirutan (8 votes) ---------------------------- [How to change the appearance of a group opener?]\url{http://mathematica.stackexchange.com/questions/46082/how-to-ch ange-the-appearance-of-a-group-opener} I would like to change the GroupOpener appearance. In the present Mma design it is too small and can be missed by a reader unfamiliar with Mma. I know, how to change its color through the ... - asked by Alexei Boulbitch (7 votes) ---------------------------- [Equivalence under common permutations]\url{http://mathematica.stackexchange.com/questions/45851/equi valence-under-common-permutations} I have lists which consists of sublists of equal length. The outer list is regarded as a multiset (that is, permutations of the sublists don't matter, but repetitions do), but the order in the ... - asked by celtschk (7 votes), answered by Leonid Shifrin (3 votes) ================================== Greatest hits from previous weeks: ================================== [Even Fibonacci numbers]\url{http://mathematica.stackexchange.com/questions/37266/even-fibo nacci-numbers} Today, I found the Euler Project. Problem #2 is Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, ... - asked by Tangshutao (22 votes), answered by rcollyer (29 votes) ---------------------------- [Problem with NonlinearModelFit]\url{http://mathematica.stackexchange.com/questions/2309/ problem-with-nonlinearmodelfit} I'm having trouble with a non-linear fit: fit = NonlinearModelFit[data, y0 + A Sin[\[Pi] (x - xc)/w], {y0, xc, A, w}, x] where data has about 15 thousand points and looks like this: The data ... - asked by becko (14 votes), answered by Oleksandr R. (25 votes) ================================== Can you answer these? ================================== [Automatic replacing of [ with []]\url{http://mathematica.stackexchange.com/questions/45992/automatic-repl acing-of-with} I tried to modify the KeyEventTranslations.tr file in order to always place a closed bracket instead of an open bracket once I press [. However once I press [ after the modification nothing happens ... - asked by Max1 (6 votes) ---------------------------- [Setting an initial value for ListAnimate?]\url{http://mathematica.stackexchange.com/questions/45892/sett ing-an-initial-value-for-listanimate} ListAnimate is fairly similar to Manipulate, but while Manipulate has a simple way to request an initial value for the manipulation parameter, I haven't found a way to tell ListAnimate to start with a ... - asked by Steve (1 vote) ---------------------------- [How can I select two lists from a list of lists so that I receive the system of equations has only rational solutions?]\url{http://mathematica.stackexchange.com/questions/45877/how-ca n-i-select-two-lists-from-a-list-of-lists-so-that-i-receive-the-system-o f} I want to make a sytem of equations has the form $$\begin{cases} a_1x^2+b_1y^2 + c_1xy+d_1x + e_1y+3=0,\\ a_2x^2+b_2y^2 + c_2xy+d_2x + e_2y+3=0. \end{cases}$$ so that the given system of equations has ... - asked by minthao_2011 (1 vote)