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R.M
5:57 AM
@J.M. Your avatar today looks more ornate than usual
 
6:54 AM
@R.M Why, thank you! That was precisely the intention. :D
 
 
4 hours later…
 
2 hours later…
12:33 PM
@GustavoBandeira I'm not really sure what you're asking about there? If you're running a custom distributed-memory build of Mathematica on a new publicly-undisclosed supercomputer such that you can reasonably expect to be able to build a list 100TB in size, I think you need to contact WRI or your HPC partner about this...
If on the other hand you had in mind to create a lazy iterator, you'll probably find this superb question/answer of use.
 
 
2 hours later…
2:51 PM
@R.M @J.M. @mr.wizard As you have noticed user Subbu is back again, without having improved anything in his behavior. I propose we suspend him again, this time for a longer period of, let's say, 1 month. Agree?
 
@SjoerdC.deVries I'm cool with it.
 
@J.M. OK, I'll do it
 
3:16 PM
@J.M. I have some troubles with editing the mod message. The markdown edit box is shifted right over the page smack down in the sidebar and I can see only half of it. Could you try it?
 
@SjoerdC.deVries Oi. Let's see...
 
It worked before...
 
@SjoerdC.deVries Okay, I did it.
 
@j.m I saw it; good. I downgraded my graphics driver today, back to the old Dell approved one. My PC got slower and slower and I saw hardware interrupts eating up 10-15% of the CPU time, so I thought the new nVidia driver might have something to do with it. Perhaps I should restart.
 
@SjoerdC.deVries You've given nVidia a piece of your mind already?
 
3:27 PM
@J.M. Uhm, what do you mean?
 
@SjoerdC.deVries Sorry, it was an idiom... I mean, have you sent them something saying that their driver doesn't play nice?
 
acl
@SjoerdC.deVries he probably has something like this in mind
 
@J.M. I knew "peace of mind", but not "piece of your mind". Learned something new. Anyway, I installed the newest driver a few weeks ago (just to see if it resolved my ongoing transparent Texture issues), but I can't be sure that it is causing my slowdowns.
 
@acl I didn't have something as colorful as Linus's reaction in mind, but that works too. :D
 
Well I tried a reinstall three times now, and it hung every time during one part. Going to restart now
 
3:48 PM
Good luck!
 
 
2 hours later…
R.M
5:31 PM
@J.M. You around?
 
@R.M Now I am. How may I help you?
 
R.M
Do you know if I can use FindRoot or something else to search for a root only within an interval?
i.e., without a smart initial guess
 
@R.M Well, FindRoot[] supports bracketing: FindRoot[Sin[x], {x, 3, 4}].
 
 
@Verde, that's from Theo Gray's home page, yes?
 
5:35 PM
@J.M. That would mean to use 3 and 4 as the first values
{x, xstart, xmin, xmax}
 
R.M
@J.M. That just uses it as the starting values
 
R.M
No guarantee it will look only in that range and return nothing if not found
 
@Rojo Ah right, you should put in a value somewhere in the middle of your interval, too...
 
R.M
@Verde there was also a nice question using Theo Gray's data that you answered on SO... one with Mendeleev's face
 
5:37 PM
@Rojo OTOH, with FindRoot[Sin[x], {x, 3, 4}, Method -> "Brent"], Brent's method genuinely treats the two given values as a bracket...
 
@R.M He have very a very nice usage of GraphPlot[]there. I am trying to reproduce it
 
@J.M. I see :)
 
R.M
@Verde Is that table a graph?
 
@R.M If the function's one-dimensional and the root is of odd multiplicity, then yes, use Brent's method.
 
By the way, I have a removable external 1tb hdd, ntfs, w7x64, balbal, and I'd like to be able to browse it and search for files, etc, when it's not available. Ideas?
 
5:40 PM
If it's an even-multiplicity root, I'd use FindMinimum[]/FindMaximum[] instead...
 
R.M
@J.M. trying Brent now... it's a function involving couple of matrix inverses, so I'm trying to aid it as much as it can to only look in the right place to reduce wasteful computations. But yes, it boils down to something 1D and odd multiplicity
 
@Rojo "when it's not available."? Meaning?
 
@Verde, meaning, when it's not plugged in
I'm happy to get a message about the file not being available if I try to open it, but I want the file tree to be always available
 
@Rojo So you want something that caches an image of your offline disk?
 
5:42 PM
@J.M. ...and that it keeps itself updated
 
or only the tree structure?
 
Tree structure
Just that
 
R.M
@Rojo sounds like you need a bad file browser... one that doesn't refresh itself :P
 
the tricky part is "and that it keeps itself updated"
@Rojo Which OS?
 
W7
 
5:44 PM
What the blue guy said. Tricky, yes.
 
If it wasn't for the update, I did a symbolic link clone of every file, reproducing the folder structure (actually, a software did it). But that's not satisfactory
 
@R.M You're lucky it's only one-dimensional... I'd have a harder time answering you if you were dealing with, say, three variables. :D
 
R.M
@J.M. I will soon :D
 
But I found a desktop indexing software such as Everything, that indexes everything ntfs, very fast, keeps itself updated. But doesn't show the "·$&%$ tree structure
W7 libraries should cache the stuff of removable drives, gr
 
@R.M Well, Richard Brent came up with another method for multidimensional problems, but you still have the responsibility of providing useful brackets...
 
R.M
5:49 PM
@J.M. I think I can always provide reasonable brackets... just trying to free myself of this stupid matrix inverse
 
@J.M. "What you have there is a constant... – J. M.♦ 23 mins ago" :D
 
@Verde From my experience in math.SE, a fair number of people don't realize what a dummy variable actually is...
 
@J.M. Yeap. You made me laugh
 
@Verde Yeah, I saw your link. Nice piece...
 
Why the third decay mode does not show the daughter?
or daughters?
 
@Verde Maybe the thallium gets split apart in many different ways that they didn't bother to enumerate.
Unfortunately, I don't have the handbook I use for checking these things at hand... sorry. :(
 
@J.M. May be, but when you use IsotopeData[] those are Legion
`decays = Select[{#, IsotopeData[#, "DaughterNuclides"]} & /@
IsotopeData[], #[[2]] != {} &];SortBy[GatherBy[
Reverse /@
Flatten[Thread[List @@ ##] & /@ decays, 1], #[[1]] &], -Length@# &]`
 
6:19 PM
I'm not entirely sure about the data either; if memory serves, one of the ways of decay for this one is K-capture, not positron emission...
 
"curated data"
 
Anyway, I don't know about the correct behavior, without looking it up in my handbook.
 
Thanks anyway!
 
I'll get back to you on that when I see my handbook tomorrow. :)
 
 
1 hour later…
7:40 PM
@J.M. I still have this problem.Any clue?
 
@SjoerdC.deVries Learn to read between the lines
or over them
 
I want to write between the lines, but it's pretty difficult if you see only parts of them
 
@SjoerdC.deVries Btw . Did you ever search for your surname in Mma help?
 
no. brb
You mean the Korteweg-de Vries equation?
 
yep. it's there :)
 
7:54 PM
that's a really cool name.
 
@Verde Thanks. However that doesn't seem to do the tricky part of updating
 
@Verde One of my better equations ;-)
 
@SjoerdC.deVries Ugh, no idea if it's the browser, the interface itself, or something... doesn't happen here (Xubuntu Oneiric, Opera 12.01)
 
@Rojo Nope. I guess you may program a "cron" batch script
 
@SjoerdC.deVries I've always been meaning to ask, but I keep forgetting... is that guy from the PDE related to you?
 
7:56 PM
@J.M. As I said, it worked when I suspended him before. Strange.
 
@SjoerdC.deVries You may sue WRI for using your surname and pentagon
 
R.M
@J.M. Tom? Heh, I think everyone of us asked Sjoerd at some point or the other...
 
@R.M FAQ! :D
 
R.M
btw, @Sjoerd Do you pronounce it with an F too or is it only for the German V?
 
7:58 PM
@R.M Like french fries?
 
R.M
@Verde you mean freedom fries?
 
@R.M I pronounce it with an F (probably because of where I was born), but most people pronounce it with a softer v sound (which differs from the soft 'b' in many languages)
 
@R.M Here we call them "fried potatoes" ... boring. Very difficult to make jokes
 
But the ie should be pronounced as the English 'ee' or 'ea' sound. freeze with a short ending s would be close
 
R.M
ok, that's close to what I thought
 
8:02 PM
Great, I've been pronouncing it right all along... :D
 
The above website shows you the distribution of my surname. In 2007 there were 71,065 of us in the Netherlands
@r.m. BTW did you see my mma.SE 'attachment' update? I'm getting farther and farther from the original question, but I found it fascinating to see how much information you could put in such a small gif.
 
Well, gotta go now... see you guys later!
 
bye!
 
@verde did you see the update?
 
8:11 PM
@SjoerdC.deVries Nope. checking it now
 
This is a 31 page notebook
 
@SjoerdC.deVries impressive usage of gifs!
 
What is the nb contains images?
@SjoerdC.deVries Yep!
Calculation of local times of sunrise, solar noon, and sunset ...
 
That would blow up the gif of course. It's best to strip the notebook of output cells.
 
8:18 PM
I don't really know if it will be accepted by the community in its present form, but impressive anyway
 
@Verde That file was a 1-to-1 translation of javascript to mma that I did a couple of years ago. It's still faster than the built-in method although not optimized at all.
 
I wonder how many pages of Mma one could store in a gravatar :)
perhaps a whole hidden colorful pentagon :)
 
@Verde My gravatar is 16384 pixels, so quite a lot
 
@SjoerdC.deVries And I guess 8 bits depth ...
 
@Verde I believe Compress uses 7 bit
 
8:23 PM
probably. all those are display chars
 
@Verde :5926532 It's far from ideal, and has a long list of disadvantages, but it's better than a throw-away file upload site. Advantages: it's quick, notebook opens in a flash without any intermediate logging-in, searching, downloading, opening.
 
but you could use your own "sCdVCompress[]"
 
If I were to get Leonid's software from GitHub it would take me five minutes (if I could find it back again)
@Verde It would save 14%, that's true
 
R.M
@SjoerdC.deVries just saw that now... pretty impressive how much can be crammed into that gif
 
@SjoerdC.deVries The only drawback I see is that image storage could be compressed in the future, loosing fidelity and probably turning the thing unreadable
 
8:27 PM
@Verde GIF uses lossless compression
 
@SjoerdC.deVries I meant storage. They may store gifs as another thing
and convert them as you ask for a file
 
converting GIFs to JPEGs would not be very useful. JPEGs are good for photos but bad for diagrams and graphs, which is the format most of the content takes here
The bar above is only 10k
 
@SjoerdC.deVries I am JUST thinking about possible drawbacks. To me, it seems a very nice solution for sharing large pieces of code.
 
R.M
just to play the devil's advocate, how is it different from using a gist/pastebin and pasting the code as plain text or the output of Compress?
 
@R.M I never used that, but is that just another ad-riddled downloaded site with a throttled download feed?
How long does it retain files?
 
8:36 PM
@R.M for starters, imgurl is associated with SO, so you get some extra security the code will remain there
 
R.M
@SjoerdC.deVries I think gists are forever, especially if you have an account
 
I just tried it. The notebook is on pastebin.com/zZDsWBvZ
@r.m. However, it lost all formatting and it won't run.
 
R.M
@Verde yeah, but your concern is actually a valid one... the data is lost if some compression is done to the images
 
It says: expires:never
 
R.M
and then: NotebookPut@ImportString[ Uncompress@Import["http://pastebin.com/raw.php?i=VmcpKVpD"], "NB"]
 
8:42 PM
@R.M. am I the devil?
 
R.M
@P.Fonseca You're too nice to be one. I nominate @Verde
 
NotebookPut@
ImportString[
Uncompress[
Import["http://pastebin.com/raw.php?i=H2cdQtJS", "Text"]], "NB"];
Oh, OK, you did (almost) the same
 
@R.M. That's nice. I agree with a gist solution, or any other type of database (if people feel more comfortable with having a control over it). Then you could say things like "have a look at the code I posted at the newsgroup (codeID: 213124)"
 
I agree with anything that's fast and comfortable. I'm already annoyed by pastebin captchas
BTW, what's pastebin's business model?
 
R.M
@P.Fonseca I guess the advantage of using the SE image uploader like Sjoerd did is that the decision to delete or yank the source is out of the user's hands once submitted. With gists, you can always delete if you have control (or email if anonymous)
 
8:48 PM
@R.M Thanks!
 
Leonid was working on some kind of add-in functionality for code storage. I wonder at what point he is, and if it can be adapted for this kind thing. We need his 2 cents on the subject.
 
@SjoerdC.deVries They allow you to upload code for 10 years. Then they blackmail you by menacing to show it to your employer
 
R.M
 
If the problem is the gists way of working, just go with a simple database table, managed by our StackExchange account moderators. The advantage is that we can also use it for posting code of other sites (like the mathgroup), we can do search on the database, by author, etc. And this is exactly the point of Leonid project. A way of managing posted code.
 
8:56 PM
@R.M That's a pity, it costs money. I was just looking into their API. It uses the POST method, which is still experimental in MMA but probably would work.
 
@P.Fonseca I don't think you really need a sophisticated SCMS if you are not involved in a shared project
 
R.M
@P.Fonseca Speaking of that... I do run the stackmma github account. We've used it to host some sample files from questions and a notebook for the blog. The long term goal is to be able to easily host notebooks if and when people want it
 
I wonder what happens with your files if you stop your subscription
 
R.M
ooh... earth quake
 
@R.M serious?
 
8:59 PM
Save the toads!
Toads an kids first!
 
6–7pm Cocktail Hour
7–10pm Keynote Dinner
busy schedule
 
@R.M I was just checking. 28 minutes ago, brawley. It's getting closer?
 
R.M
There was one there little over an hr ago... I didn't really feel that one, but I think I was walking then
The one I linked is from 5-10 mins ago
 
9:06 PM
@R.M A bit unsettling, I gather?
 
R.M
Not really, fairly common around these parts
No one's on the streets...
but it does look like more than normal activity at Brawley
 
We had a very weak one in the northern part of the country. It was man-made
 
R.M
fracking?
 
Frisco
 
R.M
1906?
 
9:10 PM
yep
 
@R.M Just normal natural gas drilling, 2.4 and 3.5 M
200 km from here. Didn't even feel it
@R.M Isn't it true that another big one is long overdue?
 
R.M
That's what they say... a big one is due
 

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