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(also known as Spartacus)


See those two pins? Well today I'm going to... stick them in you.


Ok, let me come clean: Mr.Wizard is actually an alias of mine... I'm glad I can finally confess. ― Sjoerd C. de Vries

No, I'm Spatac... I mean, Mr.Wizard! ― R.M

I'm Mr.W, and so's my wife! ― acl


@Spartacus, it was not fixable. ― rcollyer

check again; I just fixed it. :-p ― Spartacus


"This is the internet, where the men are men, the women are men and the children are FBI agents..." ― yoda Dec 18 '11 at 6:06


"My main purpose of being here is in collecting the votes. I'd even go further and say that this is my main purpose in life." ― Leonid Shifrin


"I am making some voodoo dance and invoking the rain God while we talk" ― belisarius


Some people are fortunate. Others get married. ― belisarius


It's not that easy to do the untangling even manually though. – Szabolcs

Maybe you could turn it into a puzzle and let other people do the untangling :-) – Heike

I could make a web based game, and feed all my graphs to the visitors.
SE is a big game, isn't it? :D – Szabolcs


"ListContourPlot crush on simple 5-points data" (Question title)

"Yes, this must be love at first sight."ruebenko


... but I am working with a large body of code written by an incompetent fool (i.e. myself, several years ago...) – Simon Woods


I was tempted to edit your title: "Do rules rule?" But my nose is still bleeding as a result of a limerick. – belisarius


No, but they nowadays let me turn off the lights at night; 24 hours of fluorescence was really starting to make me feral. Brett says I should also mention the tip jar... – Daniel Lichtblau Mar 13 '12 at 20:48


Project Euler


4h
answered Using Map sequentially
1d
awarded  Good Answer
1d
comment Applying functions repeatedly on parts of complicated expressions
@AndreaOrta One thing for now: understand the evaluation order difference between Replace or MapAll and ReplaceAll/ReplaceRepeated. Some references: (9233), (20181), (56062).
1d
comment Applying functions repeatedly on parts of complicated expressions
@AndreaOrta I am glad it is helpful. Please do not feel pressure to Accept this. It is far from a complete and orderly answer. I found the question a bit confusing in a quick read and I didn't want to take time to re-read it carefully. Therefore I recommended one fairly general solution rather than providing a detailed answer. I hope to return to this though honestly I'll probably find some other problem to distract me. (continued)
2d
reviewed Leave Open Region bounded by ellipse and line
2d
reviewed Close Problem adding boundary condition using DSolve
2d
comment How can I generate a $2n$-point moving maximum of a list as efficiently as MaxFilter?
Regarding lowerBound the use of -∞ will force Riffle to unpack. I believe you can replace lowerBound with Min[list].
2d
comment How can I generate a $2n$-point moving maximum of a list as efficiently as MaxFilter?
Very nice! I tried to implement the caching thing you hypothesize for MaxFilter but it ended up slower than the code I posted. Perhaps I should try again. By the way I think you can replace the Drop[Drop[ thing with MaxFilter[list, r][[r + 1 ;; -r - 1]] for a slight improvement.
2d
revised What is the complete list of valid FrontEnd Packet types?
update for v10
2d
comment Issue with Set function
Related: (9269), (9702), (29334), (29336)
2d
comment Want to compute the permutations of {1, 2, …, 11} with only 3 GB of memory
Probable duplicate: (1283)
2d
answered How can I insert an element every $n$th position in a list?
2d
revised Can someone explain this code for joining two lists by the first element of each sublist?
added 2 characters in body
2d
revised How can I generate a $2n$-point moving maximum of a list as efficiently as MaxFilter?
rasher's fix for v9.x
2d
comment Tools for factoring large numbers
I recommend you start by looking at PARI/GP. I don't have it installed, but it's free and often quite fast. Several times I was able to solve a Project Euler problem with it when Mathematica was too slow. No experience with its factorization routine however.
2d
comment Tools for factoring large numbers
Okay, I guess you want to discuss this problem in the context of Mathematica. Then the answer will depend on the nature of your large numbers. A trivial factorization such as FactorInteger[500!] is essentially instant despite the size of the factorial. However something like FactorInteger[2^339 - 1] is much slower despite the smaller integer being factored.
2d
comment Tools for factoring large numbers
This is not the right Stack Exchange site for your question. This site is specific to one software product: Mathematica by Wolfram Research. I recommend that you delete this question and repost elsewhere.
2d
reviewed Close Plotting the space-coordinate path of a projectile
2d
answered Using TransformationFunction
2d
reviewed Reviewed Using TransformationFunction