102,966 reputation
16181432
bio website
location Oregon, USA
age
visits member for 2 years, 6 months
seen 36 mins ago

Version 10 empowered!


(also known as Spartacus)

Project Euler


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



26m
comment Given f[1] … f[k], k = 1, 2, 3… how do one find the general function f[n]?
And nice work finding and illustrating a pattern. +1!
40m
comment In version 10 EvaluationCompletionAction “ShowTiming” no longer gives useful output; any solutions?
@Rojo So it is a confirmed bug? I'll mark it as such. Was any solution provided?
2h
comment How can I graph an equation with five variables?
Different tools for different tasks. I assumed that expr would be reused with different values. Pre-evaluation is a nice alternative interpretation. +1
3h
comment An argument pattern that my function can treat as Times[constant, variable]
m_goldberg, I know your edit was intended to be helpful, and the vast majority of your edits are, but I think it has been discussed that fixing syntax such as func(a, b) = . . . is a bad idea because the that is often a problem that needs to be addressed in the answers rather than "swept under the rug" as it were.
4h
comment Will Mathematica install and run on Raspberry Pi computer?
I believe several of those are part of Sage; do you use it?
4h
comment Will Mathematica install and run on Raspberry Pi computer?
Thanks. Any particular library for Python?
4h
comment Will Mathematica install and run on Raspberry Pi computer?
@Renan I am curious, what has taken its place for you?
4h
comment Fourier Analysis: How to get rid of a discontinuity
Related: (5782), (11714)
5h
comment Why does Assuming[…] work in one case but not in another?
To other users: I'm sure this is a duplicate; I don't expect any votes for my answer but it was faster to post than to search, I'm tired, and a targeted example is probably more useful to the user anyway. Please close if/when a duplicate is found. Thanks.
8h
comment BitShiftRight produces incorrect results in Version 10
That's a surprising bug. Compact example: v = Range[100001]; a = BitShiftRight[v[[;; 10]]]; b = BitShiftRight[v][[;; 10]]; a == b is False.
11h
comment Restarting Mathematica causes an animation to fail to run
I propose that we close this question as a duplicate of 11705 as I doubt the first question applied to a broad audience. +1 for the answer however.
11h
comment Programming - The linear iterative method problems
I suggest you describe the algorithm you wish to implement rather than posting broken code. I doubt it is worth the trouble to debug it.
11h
comment Best practice to group and have your favorite custom functions available at startup
Beyond the basic instruction to put them in a package and loading it at startup I fear this is entirely opinion-based and not appropriate for this site. I therefore intend to close this soon unless someone makes a compelling case to keep this open.
12h
comment Plot groups based on unique tag
@brama Thanks, and you're welcome.
14h
comment Make a text with a transparent background in Graphics
I cannot reproduce this problem. What version of Mathematica and which operating system are you using?
14h
comment Minimum and maximum values under conditions
@Vaggelis_Z If it is the use of Alternatives that you like consider: {Min@#, Max@#} & @ Pick[#6, #5, 1 | 2] & @@ (data\[Transpose])
14h
comment Minimum and maximum values under conditions
@Vaggelis_Z My point is that this is not efficiently written. Select is part of the function that is mapped to {Max,Min} therefor the selection is run twice. Worse, the selection function is not focused on the fifth column: it is checking for a 1 or 2 anywhere in the sublist. While for the given example this does not change the result it is hardly correct.
15h
comment Minimum and maximum values under conditions
@sebhofer It seems the transpose is costly because the data is not packed. Thread is actually faster in this case, but it doesn't match Part. With packed data such as data = RandomReal[{-2, 2}, {1*^6, 6}]; my code is still slightly faster than yours. :^)
15h
comment Minimum and maximum values under conditions
@sebhofer I can confirm that it is faster, and I'm not too surprised. Nevertheless like using Transpose as it lets me address columns with simply #5 or #6 which IMO make things much nicer to read. By the way you already had my vote. :-)
16h
comment Minimum and maximum values under conditions
@Vaggelis_Z I suggest you use a different method. This code performs the same selection redundantly, once for Max and once for Min.