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  • Computing e^(-j) in C..

    - by Erkan H
    I need to compute imaginary exponential in C. As far as I know, there is no complex number library in C. It is possible to get e^x with exp(x) of math.h, but how can I compute the value of e^(-j), where j = sqrt(-1)?

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  • Computing Form Location with Button

    - by user2934515
    I'm working on a programming assignment, and I'm trying to make this button take the values from two textboxes, and calculate the new location for the form window. I'm having trouble converting the textbox values to type int, and being made usable by the btnCompute_click method. private void btnCompute_Click(object sender, EventArgs e) { int x = Convert.ToInt32(txtXvalue); int y = Convert.ToInt32(txtYvalue); Location = new Point(x,y); } private void xValue_TextChanged(object sender, EventArgs e) { int xValue = Convert.ToInt32(txtXvalue); } private void yValue_TextChanged(object sender, EventArgs e) { int y = Convert.ToInt32(txtYvalue); } I forgot to add some additional info, the acceptable values for x and y must be positive. Would I use an if...else statement to control the acceptable values?

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  • amazon cloud vs rackspace cloud

    - by machaa
    Hi, I'm looking to take a dedicated server - in the process I read about Amazon Cloud computing & Rackspace Cloud Servers. Now I'm not sure which one to opt? Could somebody suggest - Performance & Price wise. Regards

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  • How to run your own cloud network at home?

    - by Xeoncross
    I have 7 PC's around the house that total more than 10Ghz in CPU power. I was wondering if I could put them to use building my own "cloud computing" network to help with rendering videos, blender animations, Photoshop effects, or anything else. Does something like this exists - and if so what is it called and where do I find it?

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  • What is massively parallel processing (MPP) ?

    - by HotTester
    Ever since Microsoft introduced sql-server version code-named "Madison" the massively parallel processing (MPP) has got into picture. What exactly is it and how does sql-server is going to benefit from it ? Further is massively parallel processing (MPP) related to parallel computing ? I read about Madison here and about parallel computing here. Thanks in advance.

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  • Le service de "Cloud computing" de jeux vidéo OnLive annonce ses dates et son prix à la Game Develop

    Mise à jour du 11/03/10 Le service de "Cloud computing" de jeux vidéo OnLive annonce ses dates et son prix à la Game Developers Conference 2010 Se déroulant actuellement, la Game Developers Conference 2010 a offert l'occasion à Mike McGarvey, responsable du projet OnLive, d'officialiser certains points sur son projet de "could computing" pour les jeux vidéo. On apprend ainsi que le service sera disponible à partir du 17 juin prochain sur la sol américain. Rien n'est précisé quand à sa disponibilité du service en Europe. Le service demandera au client de s'abonner mensuellement pour un prix de 14,95$ (soit environ 11€ par mois). Le service sera dans un p...

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  • Quels sont les avantages du Cloud Computing pour votre entreprise ? Google lance "Go Google Cloud Ca

    Quels sont les avantages du Cloud Computing pour votre entreprise ? Google lance "Go Google Cloud Calculator" pour en appréhender les bénéfices Le cloud computing intéresse de plus en plus d'entreprises, et des millions d'entre elles se sont tournées vers Google en migrant vers les Google Apps. Une décision encore audacieuse, tant il est difficile d'imaginer ce que le travail « dans le nuage » signifie vraiment et quels en sont les véritables avantages. Quel est l'impact de la collaboration en ligne sur votre lieu de travail ? Comment une capacité de stockage d'email accrue ou une messagerie instantanée intégrée et le chat vidéo pourraient avoir un impact sur la productivité de votre entreprise ?

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  • Les personnels IT pas assez qualifiés ? Oui, pour 93% des employeurs d'après un rapport de la Computing Technology Industry Association

    Les employés en informatique pas assez qualifiés pour 93% des employeurs Selon un rapport établi par la Computing Technology Industry Association La Computing Technology Industry Association, CompTIA, est un organisme à but non lucratif fondé en 1982 par 5 professionnels de l'industrie informatique. L'association s'est intéressée dans son dernier rapport aux employés travaillant dans le domaine des technologies de l'information et de la communication. Pour ce faire, elle a interrogé 500 patrons et responsables informatiques de grandes, moyennes et petites entreprises sur les compétences de leurs employés en informatique. Des employeurs du Canada, du Japon, de l'Afrique du ...

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  • What are the challenges when my enterprise desires to move the processing component of an applicatio

    - by Berkay
    Assume that i have an enterprise accounting application that consists of a front-end interface, a processing tier, and a back-end database. This is an application that contains private business data, and thus is traditionally run in a secure private network environment within the enterprise. What are the challenges that appear when my enterprise desires to move the processing component of this application to a cloud computing data center in order to achieve greater scalability or to reduce IT costs ? Pls note: do i have to make significant changes to my own infrastructure to enable external access to formerly private resources? do i have to modify the application code to handle new network topology ? thanks, if you give your answers in a simple manner, really appreciated.

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  • Real-time threat finder

    - by Rohit
    I want to make a small program that is capable to download files from the cloud onto my system. As the file reaches my system, another program on my system will analyze the file and try to find suspicious behaviors in it. I want to make a system similar to ThreatExpert (www.threatexpert.com). The suspicious data gathered by my program will be sent to Anti-Virus companies for analysis. I want to know whether this program can be written in .NET or as a PHP website. I have no experience of Cloud computing. How to retrieve files from the cloud?

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  • Setup local EC2 style cloud?

    - by John Kramlich
    I was recently given 3 dual opteron 2400 servers with 4GB of RAM and 120GB hard drives. I am interested in setting up something similar to Amazon's EC2 for my own personal web development use. Basically, I would like to spin up instances from an ISO or other disk images and have them available to test and develop software. Are there open source solutions I can use to accomplish this? I am assuming one of the machines will need to act as a controller of some sort for the other two. I use Sun's VirtualBox on my local development machine to virtualize various versions of Microsoft Windows. However, I'm not sure if that's the best tool for what I am trying to achieve. I apologize in advance if this question is to vague to get meaningful responses. I am new to cloud computing and fairly new at server administration.

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  • Cloud hosting and single hardware point of failure?

    - by PeterB
    From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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  • Open source alternative to MATLAB's fmincon function?

    - by dF
    Is there an open-source alternative to MATLAB's fmincon function for constrained linear optimization? I'm rewriting a MATLAB program to use Python / NumPy / SciPy and this is the only function I haven't found an equivalent to. A NumPy-based solution would be ideal, but any language will do.

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  • Preallocate memory for a program in Linux before it gets started

    - by Fyg
    Hi, folks, I have a program that repeatedly solves large systems of linear equations using cholesky decomposition. Characterising is that I sometimes need to store the complete factorisation which can exceed about 20 GB of memory. The factorisation happens inside a library that I call. Furthermore, this matrix and the resulting factorisation changes quite frequently and as such the memory requirements as well. I am not the only person to use this compute-node. Therefore, is there a way to start the program under Linux and preallocate free memory for the process? Something like: $: prealloc -m 25G ./program

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  • Outer product using CBLAS

    - by The Dude
    I am having trouble utilizing CBLAS to perform an Outer Product. My code is as follows: //===SET UP===// double x1[] = {1,2,3,4}; double x2[] = {1,2,3}; int dx1 = 4; int dx2 = 3; double X[dx1 * dx2]; for (int i = 0; i < (dx1*dx2); i++) {X[i] = 0.0;} //===DO THE OUTER PRODUCT===// cblas_dgemm(CblasRowMajor, CblasNoTrans, CblasTrans, dx1, dx2, 1, 1.0, x1, dx1, x2, 1, 0.0, X, dx1); //===PRINT THE RESULTS===// printf("\nMatrix X (%d x %d) = x1 (*) x2 is:\n", dx1, dx2); for (i=0; i<4; i++) { for (j=0; j<3; j++) { printf ("%lf ", X[j+i*3]); } printf ("\n"); } I get: Matrix X (4 x 3) = x1 (*) x2 is: 1.000000 2.000000 3.000000 0.000000 -1.000000 -2.000000 -3.000000 0.000000 7.000000 14.000000 21.000000 0.000000 But the correct answer is found here: https://www.sharcnet.ca/help/index.php/BLAS_and_CBLAS_Usage_and_Examples I have seen: Efficient computation of kronecker products in C But, it doesn't help me because they don't actually say how to utilize dgemm to actually do this... Any help? What am I doing wrong here?

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  • In the days of modern computing, in 'typical business apps' - why does performance matter?

    - by Prog
    This may seem like an odd question to some of you. I'm a hobbyist Java programmer. I have developed several games, an AI program that creates music, another program for painting, and similar stuff. This is to tell you that I have an experience in programming, but not in professional development of business applications. I see a lot of talk on this site about performance. People often debate what would be the most efficient algorithm in C# to perform a task, or why Python is slow and Java is faster, etc. What I'm trying to understand is: why does this matter? There are specific areas of computing where I see why performance matters: games, where tens of thousands of computations are happening every second in a constant-update loop, or low level systems which other programs rely on, such as OSs and VMs, etc. But for the normal, typical high-level business app, why does performance matter? I can understand why it used to matter, decades ago. Computers were much slower and had much less memory, so you had to think carefully about these things. But today, we have so much memory to spare and computers are so fast: does it actually matter if a particular Java algorithm is O(n^2)? Will it actually make a difference for the end users of this typical business app? When you press a GUI button in a typical business app, and behind the scenes it invokes an O(n^2) algorithm, in these days of modern computing - do you actually feel the inefficiency? My question is split in two: In practice, today does performance matter in a typical normal business program? If it does, please give me real-world examples of places in such an application, where performance and optimizations are important.

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  • SAPPHIRE NOW : SAP ouvre un site pour tester HANA, sa solution de In-Memory Computing au coeur de sa "stratégie d'innovation"

    SAPPHIRE NOW : SAP ouvre un site pour tester HANA Sa solution de In-Memory Computing au coeur de sa « stratégie d'innovation » Autre jour, autre ambiance au SAPPHIRE NOW de SAP qui se tient actuellement à Madrid. Si la présentation de Jim Hagemann Snabe, hier, était placée sous le signe de la sciences fiction, celle de Vishal Sikka, membre exécutive du Board de SAP, était aujourd'hui placé sous celui de la mythologie et de la Grèce antique. Le message, en revanche, confirmait celui introduit par le le co-PDG de la société : Cloud, Mobilité et In-Memory so...

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  • Sortie de la version 0.7 de Apache Cassandra, le SGBD NoSQL phare du Cloud Computing, utilisé par Facebook et Twitter

    Sortie de la version 0.7 de Apache Cassandra Le SGBD NoSQL phare du Cloud Computing, utilisé par Facebook et Twitter Mise à jour du 12/01/2011 par Idelways La fondation Apache vient d'annoncer la disponibilité de la version 0.7 de Cassandra, le système de gestion de base de donnée de type NoSQL conçu pour supporter des quantités massives de données. Parmi les nouveautés de cette version, l'arrivée des Indexs Secondaires, une manière efficace d'exécuter des requêtes sur des noeud locaux de stockages côté client. Autre nouveauté, le support des « Large Row », qui permettent d'avoir jusqu'à 2 milliards de co...

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  • Oracle Cloud Computing Summit? 6/15 ?·????????????

    - by kiyoshi.nira
    ????·???????????????????????????????????????????????????????????????????????????????????????????????????·??????????????????? ??????????? ?? : 2010?6?15?(?) 10:00~16:30(????:9:30~) ?? : ?·???????????? (map) ?105-8563 ????????4-8-1 ?? : CIO?????????????IT??????????????????????????????????? ???: ??(?????) ??????????? -> Oracle Cluod computing Summit

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  • How do you explain more advanced computing concepts to a non super user?

    - by EvilChookie
    I often have to explain computing concepts to non super users, and I often do it by relating computing concepts to real life situations. I wouldn't mind seeing how other super users do it, and some really good explanations might come in handy instead of me having to wing it. So, how do you explain advanced computing topics to the 'normal' people? Notes: One explanation per answer, and let the best float to the top. CW turned on, since this is subjective. Also, feel free to edit my tags if you can think of better ones =)

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