134,520 reputation
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location Oregon, USA
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visits member for 3 years, 2 months
seen 2 hours ago

(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


8h
comment Is this 30% slowdown in Mathematica 10 due to DownValues lookup time?
@RolfMertig That's very generous. I don't know yet as I don't see it as an option in my User Portal page.
13h
comment Is this 30% slowdown in Mathematica 10 due to DownValues lookup time?
So version 10 finally gets (some) of the bug fixes it needs but only in a paid upgrade? Yuck!
13h
revised How to insert a Matrix into a larger matrix
rewrite to eliminate MapThread
13h
comment How to insert a Matrix into a larger matrix
@MrZ (1) I hadn't thought about it but yes I guess in this case the result is the same even without the level parameter of MapThread. In fact MapThread can be eliminated. You can control placement by using the forth parameter of PadLeft, e.g. PadLeft[#, Dimensions@#2, #2, 1], or by using PadRight instead. ArrayPad could also be used but its padding specification is additive rather than absolute.
14h
answered How to insert a Matrix into a larger matrix
15h
answered Combining sub-matrices by replacing zero elements with symbols
17h
comment Why does Simplify ignore an assumption?
@Sjoerd Yes, and Adam explicitly states exactly that. I think it's kind of the point: to consider all variable orderings gets very expensive very quickly. I suppose optimization may be possible but I am just the messenger here.
1d
revised ListLogLinearPlot for the whole real numbers
added 2 characters in body
1d
comment How can I get from a list of characters representing a permutation to graphics showing the cycles?
letter is undefined
1d
comment How to check if two nested lists have the same structure?
@rcollyer I always appreciate the help checking my work. I voted for yours too by the way. I included an update that should be somewhat more efficient but it is not as clean as I would like. I may return to this later.
1d
revised How to check if two nested lists have the same structure?
added 371 characters in body
1d
comment How to check if two nested lists have the same structure?
@rcollyer Are you referring to the code with Inner or the correction with MapThread?
1d
revised How to check if two nested lists have the same structure?
correct my mistake
1d
answered How to check if two nested lists have the same structure?
1d
comment How to check if two nested lists have the same structure?
I believe this question is a duplicate or at least a version of an earlier one. Can anyone recall?
1d
comment How do I prune a list of pairs of numbers so that each number occurs on only one pair?
By the way Unevaluated @ Sequence[] is so mundane; all the cool kids use ##&[] now. ;^) (3705)
1d
comment How do I prune a list of pairs of numbers so that each number occurs on only one pair?
The opening is a bit terrifying, but +1 nevertheless...
1d
comment How do I prune a list of pairs of numbers so that each number occurs on only one pair?
Related: (8154)
1d
comment ListLogLinearPlot for the whole real numbers
Related: (9674)
1d
answered ListLogLinearPlot for the whole real numbers