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  • Convert a binary tree to linked list, breadth first, constant storage/destructive

    - by Merlyn Morgan-Graham
    This is not homework, and I don't need to answer it, but now I have become obsessed :) The problem is: Design an algorithm to destructively flatten a binary tree to a linked list, breadth-first. Okay, easy enough. Just build a queue, and do what you have to. That was the warm-up. Now, implement it with constant storage (recursion, if you can figure out an answer using it, is logarithmic storage, not constant). I found a solution to this problem on the Internet about a year back, but now I've forgotten it, and I want to know :) The trick, as far as I remember, involved using the tree to implement the queue, taking advantage of the destructive nature of the algorithm. When you are linking the list, you are also pushing an item into the queue. Each time I try to solve this, I lose nodes (such as each time I link the next node/add to the queue), I require extra storage, or I can't figure out the convoluted method I need to get back to a node that has the pointer I need. Even the link to that original article/post would be useful to me :) Google is giving me no joy. Edit: Jérémie pointed out that there is a fairly simple (and well known answer) if you have a parent pointer. While I now think he is correct about the original solution containing a parent pointer, I really wanted to solve the problem without it :) The refined requirements use this definition for the node: struct tree_node { int value; tree_node* left; tree_node* right; };

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  • Python new-style classes and __subclasses__ function

    - by Fraser Graham
    Can somebody explain to me why this works (in Python 2.5) : class Foo(object): pass class Bar(Foo): pass print(Foo.__subclasses__()) but this doesn't : class Foo(): pass class Bar(Foo): pass print(Foo.__subclasses__()) The latter returns "AttributeError: class Foo has no attribute '__subclasses__'" but i'm not sure why. I know this is related to old-style vs. new-style classes but i'm not clear on why that would make this functionality unavailable.

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  • Is there a way to send text to an aspcontrol via jquery

    - by Garrith Graham
    Is there a way to send data to an aspcontrol say a label called label1? Via jquery? I know jquery only likes html but is there a way to just send the raw text to an asp control using a similar method below: <script type="text/javascript"> $(document).ready(function () { var label = $("#<%= testLabel.ClientID %>"); var div = $("<div></div>").html("content").attr('id', 'test'); var serializer = new XMLSerializer(); label.text(serializer.serializeToString(div)); }); </script>

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  • Database migration

    - by graham.reeds
    We are migrating a client's own database schema to our own (both SQL-Server). Most of the mappings from their schema to ours have been indentified and rules been agreed on if the columns don't exactly align (default values etc.) Previously, depending on who was assigned the task, this has been done either with a mixture of sql scripts or one-off vb apps. I was thinking there must be a application (commercial or otherwise) where you can assign these mappings/rules and have it stream the data across. Surely the setting up and configuration of this tool would be less than the creation of ad-hoc scripts... Is there an app? Apart from the obvious 'be careful' any tips to mitigate the stress of a non-DBA porting one schema to another?

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  • Getting the type of an array of T, without specifying T - Type.GetType("T[]")

    - by Merlyn Morgan-Graham
    I am trying to create a type that refers to an array of a generic type, without specifying the generic type. That is, I would like to do the equivalent of Type.GetType("T[]"). I already know how to do this with a non-array type. E.g. Type.GetType("System.Collections.Generic.IEnumerable`1") // or typeof(IEnumerable<>) Here's some sample code that reproduces the problem. using System; using System.Collections.Generic; public class Program { public static void SomeFunc<T>(IEnumerable<T> collection) { } public static void SomeArrayFunc<T>(T[] collection) { } static void Main(string[] args) { Action<Type> printType = t => Console.WriteLine(t != null ? t.ToString() : "(null)"); Action<string> printFirstParameterType = methodName => printType( typeof(Program).GetMethod(methodName).GetParameters()[0].ParameterType ); printFirstParameterType("SomeFunc"); printFirstParameterType("SomeArrayFunc"); var iEnumerableT = Type.GetType("System.Collections.Generic.IEnumerable`1"); printType(iEnumerableT); var iEnumerableTFromTypeof = typeof(IEnumerable<>); printType(iEnumerableTFromTypeof); var arrayOfT = Type.GetType("T[]"); printType(arrayOfT); // Prints "(null)" // ... not even sure where to start for typeof(T[]) } } The output is: System.Collections.Generic.IEnumerable`1[T] T[] System.Collections.Generic.IEnumerable`1[T] System.Collections.Generic.IEnumerable`1[T] (null) I'd like to correct that last "(null)". This will be used to get an overload of a function via reflections by specifying the method signature: var someMethod = someType.GetMethod("MethodName", new[] { typeOfArrayOfT }); // ... call someMethod.MakeGenericMethod some time later I've already gotten my code mostly working by filtering the result of GetMethods(), so this is more of an exercise in knowledge and understanding.

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  • Asychronous page update with ASP.NET MVC

    - by Graham
    Hi, I'm learning ASP.NET MVC 1.0 and need to implement an asynchronous/dynamic page update. I'm new to MVC and jQuery so I'm not sure what to look for. What I want to do is to allow a user to start a monitoring a domain layer function (similar to a news ticker) and then do a partial page update based on the continously changing results. In ASP.NET I'd do this with a javascript timer to cause a postback, and an AJAX update panel..... but this seems a bit "hacky" for ASP.NET MVC. Is there a better way?

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  • Multiple repositories, single setup

    - by graham.reeds
    If I use multiple repositories, all located under a single root folder, how can I set it up so that they will use a single master svnconf/passwd file for setup but still allow me to customize each if the need arises? This is on windows but I guess the process would be similar on other systems. Update: I am using svnserve as a service.

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  • A Tkinter StringVar() Question

    - by Graham
    I would like to create a StringVar() that looks something like this: someText = "The Spanish Inquisition" #Here's a normal variable whose value I will change eventually TkEquivalent = StringVar() #and here's the StringVar() TkEquivalent.set(string(someText)) #and here I set it equal to the normal variable. When someText changes, this variable will too... HOWEVER: TkEquivalent.set("Nobody Expects " + string(someText)) If I do this, the StringVar() will no longer automatically update! How can I include that static text and still have the StringVar() update to reflect changes made to someText? Thanks for your help.

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  • EPPM Is a Must-Have Capability as Global Energy and Power Industries Eye US$38 Trillion in New Investments

    - by Melissa Centurio Lopes
    Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} “The process manufacturing industry is facing an unprecedented challenge: from now until 2035, cumulative worldwide investments of US$38 trillion will be required for drilling, power generation, and other energy projects,” Iain Graham, director of energy and process manufacturing for Oracle’s Primavera, said in a recent webcast. He adds that process manufacturing organizations such as oil and gas, utilities, and chemicals must manage this level of investment in an environment of constrained capital markets, erratic supply and demand, aging infrastructure, heightened regulations, and declining global skills. In the following interview, Graham explains how the right enterprise project portfolio management (EPPM) technology can help the industry meet these imperatives. Q: Why is EPPM so important for today’s process manufacturers? A: If the industry invests US$38 trillion without proper cost controls in place, a huge amount of resources will be put at risk, especially when it comes to cost overruns that may occur in large capital projects. Process manufacturing companies must not only control costs, but also monitor all the various contractors that will be involved in each project. If you’re not managing your own workers and all the interdependencies among the different contractors, then you’ve got problems. Q: What else should process manufacturers look for? A: It’s also important that an EPPM solution has the ability to manage more than just capital projects. For example, it’s best to manage maintenance and capital projects in the same system. Say you’re due to install a new transformer in a power station as part of a capital project, but routine maintenance in that area of the facility is scheduled for that morning. The lack of coordination could lead to unforeseen delays. There are also IT considerations that impact capital projects, such as adding servers and network cable for a control system in a power station. What organizations need is a true EPPM system that’s not just for capital projects, maintenance, or IT activities, but instead an enterprisewide solution that provides visibility into all types of projects. Read the complete Q&A here and discover the practical framework for successfully managing this massive capital spending.

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  • Largest triangle from a set of points

    - by Faken
    I have a set of random points from which i want to find the largest triangle by area who's verticies are each on one of those points. So far I have figured out that the largest triangle's verticies will only lie on the outside points of the cloud of points (or the convex hull) so i have programmed a function to do just that (using Graham scan in nlogn time). However that's where I'm stuck. The only way I can figure out how to find the largest triangle from these points is to use brute force at n^3 time which is still acceptable in an average case as the convex hull algorithm usually kicks out the vast majority of points. However in a worst case scenario where points are on a circle, this method would fail miserably. Dose anyone know an algorithm to do this more efficiently? Note: I know that CGAL has this algorithm there but they do not go into any details on how its done. I don't want to use libraries, i want to learn this and program it myself (and also allow me to tweak it to exactly the way i want it to operate, just like the graham scan in which other implementations pick up collinear points that i don't want).

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  • Volume Shadow Copy not starting

    - by Gram
    Hi We are running a Windows 2008 Small Business Server with Symantec Backup Exec. Last night the back up failed due to the Volume Shadow Copy service being unable to start. When I try to manually start it I get the following error "windows could not start the volume shadow copy on local computer" Has anybody any suggestions other than rebooting the server? many thanks Graham

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  • Raspberry Pi Powered Coffee Table Serves Up Arcade Classics

    - by Jason Fitzpatrick
    If your living room is boring for want of a plethora of arcade hits, this DIY project parks a Raspberry Pi powered arcade machine in a coffee table for at-your-finger-tips retro gaming. Courtesy of tinker Graham Gelding, this build combines a 24-inch monitor, arcade buttons, a Raspberry Pi board, and a wooden coffee table to great effect. The end result is a table-top style arcade that also doubles, courtesy of a wireless keyboard and mouse, as a web browsing and email station. Hit up the link below for more information. Coffee Table Pi [via Hack A Day] HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8 How To Play DVDs on Windows 8

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  • Estudio de caso: CFO de At&T le apunta a la tecnología para transformar las Finanzas Globales

    - by RED League Heroes-Oracle
    AT&T es una de las pocas multinacionales modernas que han participado de todas las etapas anteriores de la innovación de las telecomunicaciones, de Alexander Graham Bell como inventor solitario, a Bell Labs, a los lanzamientos acelerados en las fundiciones de AT&T. La tecnología es el corazón de todo lo que AT&T hace, incluyendo sus inversiones en innovaciones tecnológicas para permitir que las finanzas de AT&T trabajen más estratégicamente con los negocios para asegurar que las inversiones en las iniciativas de crecimiento sean exitosas. Según John Stephens, Vicepresidente Ejecutivo y director financiero de AT&T, la empresa ha trazado un plan de inversión de tres años para mejorar y aumentar sus redes IP de banda ancha alámbricas e inalámbricas. El plan incluye la implementación del servicio 4G LTE para 300 millones de personas en los Estados Unidos, expansión de IP de banda ancha de alta velocidad a unos 57 millones de hogares de clientes y una expansión de la fibra a 1 millón de clientes corporativos adicionales en su área de servicio de telefonía fija. "La necesidad de velocidad es mayor que nunca, y este proyecto es nuestro paso hacia la innovación para ofrecer tal velocidad," dice Stephens. Como AT&T moderniza su infraestructura global, sus procesos operacionales se hacen tan poderosos como su red. Ha sido una tarea grande y compleja, pero Stephens se complace al decir que el departamento de finanzas de AT&T ha adoptado su papel de catalizador corporativo. Empezó con un concepto simple: "Vamos a hacer que todos hablen en el mismo idioma". Esto llevó a la consolidación de sistemas financieros heredados de las empresas adquiridas. No fue una tarea sencilla, dado que la empresa pasó por más de cinco adquisiciones importantes y un sinfín de otras transacciones. En 2007, AT&T tenía 17 aplicaciones apenas en la función de cuentas por pagar. Hoy, el número se ha reducido a dos. Asimismo, hubo 50 sistemas de reportes gerenciales oficiales y ahora hay tres, con planes de excluir uno de ellos. Al tener un único lenguaje volcado a las Finanzas en toda la empresa, el equipo de finanzas de AT&T ha eliminado las varias versiones de los mismos datos, reduciendo la posible confusión en las discusiones y en las decisiones de estrategia de negocios. Estos pasos también han reducido los costos y aceleraron la toma de decisiones. "Lo lindo de los sistemas es que permiten que la gente talentosa con habilidades analíticas usen su tiempo en esa zona, en vez de gastar tiempo en recolección, agregación y organización de los datos," señala Stephens. "Tenemos un proceso eficiente y eficaz que hace que nosotros, dejemos a la gente libre para dedicarse a aquello en que son realmente buenos. Y tenemos un equipo de alta calidad y ellos están en su mejor punto cuando son capaces de hacer su función para apoyar a la unidad de negocio”AT&T es una de las pocas multinacionales modernas que han participado de todas las etapas anteriores de la innovación de las telecomunicaciones, de Alexander Graham Bell como inventor solitario, a Bell Labs, a los lanzamientos acelerados en las fundiciones de AT&T. La tecnología es el corazón de todo lo que AT&T hace, incluyendo sus inversiones en innovaciones tecnológicas para permitir que las finanzas de AT&T trabajen más estratégicamente con los negocios para asegurar que las inversiones en las iniciativas de crecimiento sean exitosas.  Según John Stephens, Vicepresidente Ejecutivo y director financiero de AT&T, la empresa ha trazado un plan de inversión de tres años para mejorar y aumentar sus redes IP de banda ancha alámbricas e inalámbricas. El plan incluye la implementación del servicio 4G LTE para 300 millones de personas en los Estados Unidos, expansión de IP de banda ancha de alta velocidad a unos 57 millones de hogares de clientes y una expansión de la fibra a 1 millón de clientes corporativos adicionales en su área de servicio de telefonía fija. "La necesidad de velocidad es mayor que nunca, y este proyecto es nuestro paso hacia la innovación para ofrecer tal velocidad," dice Stephens. Como AT&T moderniza su infraestructura global, sus procesos operacionales se hacen tan poderosos como su red. Ha sido una tarea grande y compleja, pero Stephens se complace al decir que el departamento de finanzas de AT&T ha adoptado su papel de catalizador corporativo. Empezó con un concepto simple: "Vamos a hacer que todos hablen en el mismo idioma". Esto llevó a la consolidación de sistemas financieros heredados de las empresas adquiridas. No fue una tarea sencilla, dado que la empresa pasó por más de cinco adquisiciones importantes y un sinfín de otras transacciones. En 2007, AT&T tenía 17 aplicaciones apenas en la función de cuentas por pagar. Hoy, el número se ha reducido a dos. Asimismo, hubo 50 sistemas de reportes gerenciales oficiales y ahora hay tres, con planes de excluir uno de ellos. Al tener un único lenguaje volcado a las Finanzas en toda la empresa, el equipo de finanzas de AT&T ha eliminado las varias versiones de los mismos datos, reduciendo la posible confusión en las discusiones y en las decisiones de estrategia de negocios. Estos pasos también han reducido los costos y aceleraron la toma de decisiones. "Lo lindo de los sistemas es que permiten que la gente talentosa con habilidades analíticas usen su tiempo en esa zona, en vez de gastar tiempo en recolección, agregación y organización de los datos," señala Stephens. "Tenemos un proceso eficiente y eficaz que hace que nosotros, dejemos a la gente libre para dedicarse a aquello en que son realmente buenos. Y tenemos un equipo de alta calidad y ellos están en su mejor punto cuando son capaces de hacer su función para apoyar a la unidad de negocio”

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  • Oracle is #1 in the RDBMS Sector for 2011

    - by jgelhaus
    Gartner 2011 Worldwide RDBMS Market Share Reports 48.8% revenue share for Oracle (*) Gartner has published their market share numbers for 2011 based on total software revenues.  According to Gartner, Oracle: is #1 in worldwide RDBMS software revenue share holds more revenue share than its seven closest competitors combined grew at 18.0%, exceeding both the industry average (16.3%) and the growth rates of its closest competitors. (*) Source: Market Share: All Software Markets, Worldwide 2011 by Colleen Graham, Joanne Correia, David Coyle, Fabrizio Biscotti, Matthew Cheung, Ruggero Contu, Yanna Dharmasthira, Tom Eid, Chad Eschinger, Bianca Granetto, Hai Hong Swinehart, Sharon Mertz, Chris Pang, Asheesh Raina, Dan Sommer, Bhavish Sood, Marianne D'Aquila, Laurie Wurster and Jie Zhang. - March 29, 2012

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  • What's the format of Real World Performance Day?

    - by william.hardie
    A question that has cropped a lot of late is "what's the format of Real World Performance Day?" Not an unreasonable question you might think. Sure enough, a quick check of the Independent Oracle User Group's website tells us a bit about the Real World Performance Day event, but no formal agenda? This was one of the questions I posed to Tom Kyte (one of the main presenters) in our recent podcast. Tom tells us that this isn't your traditional event where one speaker follows another with loads of slides. In fact, the Real World Performance Day features Tom and fellow Oracle performance experts - Andrew Holdsworth and Graham Wood - continuously on stage throughout the day. All three will be discussing database performance challenges and solutions from development, architectural design and management perspectives. There's going to be multi-terabyte demos on show, less of the traditional slides, and more interactive debate and discussion going on. Tune-in and hear what else Tom has to say about this fairly unique event!

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  • Steve Jobs est "un méchant dictateur" d'après un expert en nouvelles technologies, et vous, qu'en pensez-vous?

    Steve Jobs est "un méchant dictateur" d'après un expert en nouvelles technologies, et vous, qu'en pensez-vous ? Paul Graham, CEO de Y Combinator (entreprise qui investit dans des start-ups), a donné une interview à Bloomberg la semaine dernière. Lors de cet entretien, il n'a pas mâché ses mots. Parlant de l'industrie des nouvelles technologies, et donnant des conseils aux nouveaux entrepreneurs, il s'est ensuite penché sur le cas Apple. Il a alors déclaré que le monopole est toujours une mauvaise chose, par rapport au fait que la firme de Cupertino pourrait devenir le "Microsoft du mobile". Il a ensuite ajouté : "La situation est vraiment ironique et je me demande ce que Steve Jobs en pense. ...

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  • What is Perl's relation with hackers?

    - by K.Steff
    I know Perl is a language revered by many hackers (as in hacker vs cracker) and respected by many good programmers for its expressiveness. I also realize it is useful to know and it's very handy at generalizing common Unix tasks (Unix here includes Linux and Cygwin). I also know that being a good hacker probably means you're a good programmer in general (references on this one are sparse around the web, but about everything Paul Graham has ever written seems approving of this statement to me). So my question is whether there is a reason that attracts hackers to Perl in particular? Will learing Perl improve my general programming, problem-solving and hacking skills if done properly? Does it present unique tools that are more useful to a hacker?

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  • Who are the thought leaders in software engineering/development? [closed]

    - by Mohsin Hijazee
    Possible Duplicate: What are the big contemporary names in the programming field? I am sorry if it is a duplicate questions or is useless. I want to compile a list of influential people in our industry who can be termed as "opinionated" and thought leaders. There are basically two characteristics that I'm referring to here: The person has introduced new concepts/terminology/trends or talked about existing ones in thought provoking way. Majority or part of the writings are available online. Some of the people who I think as thought leaders are as under: Martin Fowler Known for domain specific languages, Active Record, IoC. Joel Spolsky known for his 12 point Joel test, Law of Leaky abstractions. Kent Beck known for XP. Paul Graham. Any other names and links?

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  • What is Perl's relation to hackers? [closed]

    - by K.Steff
    I know Perl is a language revered by many hackers (as in hacker vs cracker) and respected by many good programmers for its expressiveness. I also realize it is useful to know and it's very handy at generalizing common Unix tasks (Unix here includes Linux and Cygwin). I also know that being a good hacker probably means you're a good programmer in general (references on this one are sparse around the web, but about everything Paul Graham has ever written seems approving of this statement to me). So my question is whether there is a reason that attracts hackers to Perl in particular? Will learing Perl improve my general programming, problem-solving and hacking skills if done properly? Does it present unique tools that are more useful to a hacker?

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  • For business information and web traffic T4 and Solaris 11 stand head and shoulders above the crowd

    - by rituchhibber
    Everyone is talking about encryption of business information and web traffic. T4 and Solaris 11 stand head and shoulders above the crowd. Each T4 chip has 8 crypto accelerators inside the chip - that means there are 32 in a T4-4.  These are faster and offer more algorithms than almost all standalone devices and it is all free with T4!  What are you waiting for?Please contact Lucy Hillman or Graham Scattergood for more details.Your weekly tea time soundbite of the latest UK news, updates and initiatives on the SPARC T Series servers. T4 good news, best practice and feedback is always welcome.

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  • Will modem manager be updated in 12.04 LTS to release 0.6.0 or above by Canonical?

    - by user204045
    It is still stuck at release 0.5.2 since early last year, while release 0.6.0 does not seem to be progressed to a stable release for 12.04 LTS. Any plans for the update to occur before the end of the year? In a related but separate question, I note that the latest Modem Manager GUI (0.0.16) has now been released for Saucy Salamander in its Software Center, but still with the older 0.0.13 version for Precise's Software Center - why does it not follow suit? Perhaps Mathieu Trudel-Lapierre or Graham Inggs can offer some help with answers if no one else can? Thanks in advance!

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  • What software has been written in Scheme?

    - by skiphoppy
    I loved Scheme in the programming languages concepts class I took several years ago. Ever since reading what Paul Graham has to say about Lisp, I've been intending to go back and pick Scheme up again and see if it'll improve my programming in general. Are there any well-known works of software written in Scheme? Open source packages? Websites?

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