@belisarius do the two last days's votes add up to the right one? maybe eg the script has changed to consider date in a different timezone than yesterday and it's lagging?
100 Greatest Britons was broadcast in 2002 by the BBC. The programme was based on a television poll conducted to determine whom the United Kingdom public considered the greatest British people in history. The series, Great Britons, included individual programmes featuring the individuals who featured in the top ten, with viewers having further opportunities to vote after each programme. It concluded with a debate. All of the top 10 were dead by the year of broadcast.
The poll resulted in nominees including Guy Fawkes, who was executed for trying to blow up the Parliament of England; Oliv...
Connections is a ten-episode documentary television series created, written and presented by science historian James Burke. The series was produced and directed by Mick Jackson of the BBC Science & Features Department and first aired in 1978 (UK) and 1979 (USA). It took an interdisciplinary approach to the history of science and invention and demonstrated how various discoveries, scientific achievements, and historical world events were built from one another successively in an interconnected way to bring about particular aspects of modern technology. The series was noted for Burke's cris...
The Ascent of Man is a thirteen-part documentary television series produced by the BBC and Time-Life Films first transmitted in 1973, written and presented by Jacob Bronowski. Intended as a series of "personal view" documentaries in the manner of Kenneth Clark's 1969 series Civilisation, the series received acclaim for Bronowski's highly informed but eloquently simple analysis, his long unscripted monologues and its extensive location shoots.
Overview
The 13-part series was shot on 16mm film. Executive Producer was Adrian Malone, film directors were Dick Gilling, Mick Jackson and David...
but I have never seen them. the book was fantastic though
In September and October 2012, almost a year after his death, allegations that the English DJ and BBC television presenter Sir Jimmy Savile (1926–2011) had sexually abused under-age adolescent and prepubescent girls and boys, and adults, became widely publicised.
By 11 October 2012 allegations had been made to 13 British police forces, and led to the setting-up of inquiries into practices at the BBC and within the National Health Service. On 19 October the Metropolitan Police Service launched a formal criminal investigation, Operation Yewtree, into historic allegations of child s...
@belisarius Well, I have one absolutely foolproof way — I just need to join PE and overtake @mr.wizard's tally so that he'll be forced to spend more time there =)
@Mr.Wizard It was @rm-rf! He tempted me to help. When I told him that you're my favorite mod and I could never kill you he trashed all his messages using his toad.fu and leaved me appearing as the culprit. I swear!
@rm-rf I have no delusions of any great accomplishment on Project Euler. Sasha solved every problem I did (he had a list by number) and nearly a hundred more in short order once he started.
@belisarius "This woman you gave me handed me some fruit and I ate." -- sound familiar? :-P
MatrixForm is a wrapper that pretty-prints your matrices. When you do the following:
cov = {{0.02, -0.01}, {-0.01, 0.04}} // MatrixForm
you're assigning the prettified matrix to cov (i.e., wrapped inside a MatrixForm). This is not accepted as an input by most functions (perhaps all) that take ...
@Ajasja Perhaps there's another way to do it because I seem to recall having done it successfully, but I also recall having failed with v8.0.0 too. I mean, setting the global option DefaultStyleDefinitions to some "blablacustom.nb"
@Ajasja see @Rojo's excellent description here. Basically, because CompoundExpression doesn't effect any sort of transformation, when Return walks back up the stack, it doesn't find anything. Hence you get Return["A"] sent back to top level.
@Acl @OleksanderR @all Any recommendation for a C++ numeric library? I'll mostly just need one huge list of 1D vectors (that should be able to resize dynamically), some Gaussian random numbers and some eigen value calculations. I think this is coved by most (eigen, it++, Aramadilo...). Actually the most important thing is **friendly syntax**.
The original equation comes from here.
The central equation to solve is equation (16), which is of the form:
$\dfrac{\partial f_n(x;\tau)}{\partial \tau}
=\left[
[-(n-6)+\dot{\bar{A}}x]\dfrac{\partial}{\partial x}+2\dot{\bar{A}}-(c_++c_-)n
\right]f_n(x;\tau)
+c_+(n-1)f_{n-1}(x;\tau)+c_-(n+1)f_...
Anyone have experience with keeping contexts clean of valueless symbols?
For instance when defining f[x_]:=x^2 in a package with context pkg', it'll export both f and x, which means that future definitions to x set pkg'x rather than Global'x. But removing x in the package leads to ugly definitions for x eg: f[Removed[x]:_]:=Removed[x]^2.
So I basically need to put all of the actual implimentation outside of the BeginPackage, and then just write a list of function symbols that make up the actual package?
By defining a usage message for f outside the private context, I make it public or in other words, in TestPackage`f, so that when you load the package, TestPackage` is on the context path and f is accessible. x however will reside in TestPackage`Private` , which is not on the path
Got f being snapped up by the wrong context. So Now I'm left with definitions referencing private contexts, which I suppose is nicer than the Removed symbols.
@jVincent Yes, it will reference the private context because that is where the symbol x resides. Typically, if you're writing a package for others, the idea is that users won't need to worry about internal implementations, so you just expose the public ones and hide the rest (via read protected). Those who know how to look will look anyway. As the developer, you have access to the actual file which is free of all the foo`private` stuff
@jVincent If you still want to read definitions when working, you could either use something like my simple redefinition of Definitionhere or use Simon Woods' Spelunk
@rm-rf Sure, and if someone want's the symbols to look nicer I suppose he can put the priave context on the path and get the definition and remove it again.
@ssch Probably Manipulate is the culprit rather than Rasterize... I had this happen on v9 with some other function (inside manipulate). If I remember right, v8 would've waited till the computation finished
> Settings for TouchscreenAutoZoom will have no effect unless Mathematica or Player is running on a touchscreen device supported by Wolfram Research, such as the iPad.
I didn't know you could run CDF on iPads... or is that meant to be future proof?
@belisarius Yes, It's this code: mathematica.stackexchange.com/a/20015/1517 putting divisions to 8, clicking Star, and then Rasterize[<that manipulate>] for lower values of divisions like 3 it works
(I cheated with the screenshot there and put a rasterized version of the graphics inside a manipulate with same controls)
@belisarius tutorial/AdvancedManipulateFunctionality mentions there is a time limit on manipulate evaluations, but not where it is set: And beyond five seconds you will start seeing $Aborted instead of the number, because the system is protecting itself from unreasonably long evaluations, which block other activity in the front end in this situation.
May be it is just me, but I find it strange that on wolfram.com/support/community WRI does not list this Mathematica site as part of the community, but they list the internet Mathematica newsgroup there! Yet, Mathematica on stackexchange is much much larger now than the newsgroup and has much more useful Mathematica information for the community.
Is it possible that WRI does not know about this site?
Hmm, I'm 99% certain they know about it, we probably are a competitor for their training programs. Newsgroups are ok, but SE blows them out of the water.
Hell I emailed a rep last night saying I don't need any of their training, SE + docs + google gives me all the training I need.
They were hunting me after I watched one of their training vids on "functional mma programming".
@andre, sorry was away. Yes archives for Mathforum are very useful ofcourse. @others, well, for me, WRI should be interested in making Mathematica more popular I would think. Hence not letting people know about other sites such as this with lots of useful information about Mathematica and where someone can get fast help on Mathematica does not seem to make much sense to me specially if done by the same company that makes Mathematica. But what do I know, I am just an engineering student.
I'm afraid so. I'm learning C++, since this is what most people use and what a lot of the programs I use are written in (NAMD, VMD, ...) For the project I have in mind I don't need much: a list capable of holding ~4*10^7 elements of n sized vectors (where n is the same in the whole list and from 1 to 4). Then I have to make a histogram list of these elements and calculate the eigen values and vectors of the covariance matrix obtained from the elements. In short I only need to get the eignevalues of at most 4x4 matrix.
I asked about C++ because I was going to suggest using the GSL, which is written in C but can be used from C++ (this is how I use it). I am not sure how well it performs with large-scale stuff as I've never used it for that. certainly the eigenvalue part is doable there
however when you put it like that, why do you need any libraries? you could use STL containers to build up whatever you need; binning things is not that hard, I think. and solving a 4d eigensystem can be done as inefficiently as you want :)
anyway the problem with GSL is that you need to think in both C and C++ to use it (or anyway I do, but I'm pretty bad at both; others will probably find it easy)
@acl Yes, that's what I'm considering now. But from experience the project requirements always grow... :) Also I don't have any particular desire to write basic containers. Butt std::Vector is probably sufficient for my needs.
About GSL: I'd rather write J(1,2)=343 than gsl_matrix_set (J, 1, 2, 343);
@belisarius I don't know. but he/she at least tried. the other question just says: "hi! read this PRE, understand what the boundary condition is, and tell me how to do it in mathematica".
@belisarius well yes, in the sense that stealing is stealing whether you steal a bottle of water or the entire life savings of a poor mother on her way to buy bread with the last of her money for her starving child
@acl Oh, yeah! They call themselves physicists, engineers, chemists, you know. One week ago a colleague said that the algorithm we were using isn't the robust one because that paper was too long
@acl No. He rolled up his own (very simplified) one. It has problems only in some corner cases. Regrettably, that corner cases are the only ones that matter to us.
@belisarius that's what I tend to do too, write up some random half-thought-out algorithm I just came up with to do things. very slowly, not robustly (so I need to do it in two different ways to check), takes longer than actually looking up how it should be done. but no.
I have managed to avoid publishing anything wrong by a continuing series of miracles
@Xerxes Just because being a referee and/or author in those journals gives you prestige. How much does it cost to provide the same service in a site like this one?