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• Parallel Computing in .Net 4.0

  - by kaleidoscope

  Technorati Tags: Ram,Parallel Computing in .Net 4.0 Parallel computing is the simultaneous use of multiple compute resources to solve a computational problem: To be run using multiple CPUs A problem is broken into discrete parts that can be solved concurrently Each part is further broken down to a series of instructions Instructions from each part execute simultaneously on different CPUs Parallel Extensions in .NET 4.0 provides a set of libraries and tools to achieve the above mentioned objectives. This supports two paradigms of parallel computing Data Parallelism – This refers to dividing the data across multiple processors for parallel execution.e.g we are processing an array of 1000 elements we can distribute the data between two processors say 500 each. This is supported by the Parallel LINQ (PLINQ) in .NET 4.0 Task Parallelism – This breaks down the program into multiple tasks which can be parallelized and are executed on different processors. This is supported by Task Parallel Library (TPL) in .NET 4.0 A high level view is shown below:

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• DOT implementation

  - by Denis Ermolin

  I have some DOT(damage over time) implementation problems. My game runs on 30 FPS speed. Current implementation is: let's say hero cast spell which make 1 damage per second. So on every frame i do (pseudo code): damage_done = getRandomDamage() * delta_time; I accumulate damage and when it becomes more then 0 then subtract rounded damage from current health and so on. With 30 FPS and 1 DPS it will be 1/33 = 0.05... We know that floats a not precise enough to sum 30 circulating decimals and have exact 1 in the end. But HP is discrete value and that's why 1 DPS will not have 1 damage after 1 second because value will be 0.9999..... It's not so big deal when you have 100000 DPS - +/- 1 damage will not be noticeable. But if i have 1, 5 DPS? How modern RPG's implemented DOT's?

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• Making own clothes website [on hold]

  - by Manjushree

  I am BSc student in Mathematics but i would like to create own clothes website. Can anyone help me how can i design the clothes website. I never have any background knowledge about making the webpage online. The clothes website does not have to look professional but simple enough where i can put my clothes to show the items to people or customers. Once I created the clothes website then i can open the business account and starting selling the goods online with that account. Do i need to buy any domains to create the website? Please help me?

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• Can this word search algorithm be made faster?

  - by Ashwin Singh

  Problem: Find a match of word S in text T Given: S and T are part of spoken and written English. Example: Match 'Math' in 'I love Mathematics' NOTE: Ignore CASES. My algorithm: STEP 1) Convert S, T to char[] STEP 2) for i=0, i < T.length , i++ STEP 3) for j=S.length-1, j>0 , j-- STEP 3 is the magic, instead of going about matching M,A,T,H, this matches M, H, T and finally A. This helps in eliminating a lot of possible partial matches. For example, if I go sequentially like M A as in Boyer Moore's method ... it can match Matter, Mass, Matchstick etc. using M _ _ H will bring down size of partial matches. STEP 4) if S[j]!=T[i] -> break; else if j==i -> PRINT MATCH

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• Should I get my masters in Game Design and Development or Computer Science?

  - by Christopher Stephenson

  I am a recent grad with a B.S. in IT while I didn't minor in Game Desgin and development, I took few classes in it. During my job search I have seen that most gaming companies seems to want someone that majored in C.S, mathematics, or physics. During my undergrad I never had to take physics nor did I learn much about data structures and algorithms. These seem to be really important when searching for a job in game development. So I am thinking about going back to school to get my masters in either CS, or GDD. The problem though is which one? I am really not looking to create my own games, I just want to work on games.

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• Physics-based dynamic audio generation in games

  - by alexc

  I wonder if it is possible to generate audio dynamically without any (!) audio assets, using pure mathematics/physics and some input values like material properties and spatial distribution of content in scene space. What I have in mind is something like a scene, with concrete floor, wooden table and glass on it. Now let's assume force pushes the glass towards the edge of table and then the glass falls onto the floor and shatters. The near-realistic glass destruction itself would be possible using voxels and good physics engine, but what about the sound the glass makes while shattering? I believe there is a way to generate that sound, because physics of sound is fairly known these days, but how computationaly costy that would be? Consumer hardware or supercomputers? Do any of you know some good resources/videos of such an experiment?

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• Enterprise Trade Compliance: Changing Trade Operations around the World

  - by John Murphy

  We live in a world of incredible bounty and speed where any product can be delivered anywhere on earth. However, our world is also filled with challenges for business – where volatility, uncertainty, risk, and chaos are our daily companions. To prosper amid the realities of this new world, organizations cannot rely on old strategies; they need new business models. Key trends within the global economy are mandating that companies fully integrate global trade management best practices within broader supply chain management strategies, rather than simply leaving it as a discrete event at the end of the order or procurement cycle. To explain, many companies face a complicated and changing compliance environment. This is directly linked to the speed and configuration of the supply chain, particularly with the explosion of new markets, shorter service cycles and ship times, accelerating rates of globalization and outsourcing, and increasing product complexity and regulation. Read More...

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• How can I share my python scripts with my less python-savvy business person partner?

  - by Alex

  I'm taking financial mathematics as an elective, and I'm working with real life finance industry worker type people. It's actually kind of fun. When I pulled out a macbook at one of our meetings, I had four lifelong windows users look at me like I had three heads. Anyway, I'm helping with design and simulation of our trading strategy, and I wrote a little thing using matplotlib to visualize historical stock data. However, these guys don't know how to use git, or install python, or deal with path-related package management things. I need to be able to send my scripts to them to use, and I need to do it with absolutely minimal effort on their part. I was thinking something on the lines of py2exe, but I'd like to hear some advice before I go ahead.

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• Les réseaux de fibre optique trans-océanique proches de leur capacité maximale, comment gérer cette saturation ?

  Les réseaux de fibre optique trans-océanique proches de leur capacité maximale, comment gérer cette saturation ? C'est une information qui est restée assez discrète dans l'actualité, et qui pourtant soulève de nombreuses questions. Il semblerait en effet que le manque d'adresse IPv4 ne soit pas la seule pénurie qu'aient à affronter les internautes du monde entier dans les prochains mois et années. Michael Cembalest, qui travaille pour JP Morgan, a publié le graphique suivant, à propos des connexions intercontinentales. Son message ? La capacité des réseaux de fibre optique trans-océanique arrive à son maximum. Autrement dit, on ne va pas pouvoir continuer de pousser le bouchon... Pour l'instant, cette ...

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• UPK Pre-Built Content Update

  - by Karen Rihs

  UPK pre-built content development efforts are always underway and growing. Over the last few months, the following new and upgraded modules became available:  NEW CONTENT RELEASES E-Business Suite 12.1 Field Service Manufacturing Operations Center Process Manufacturing:  System Administration Strategic Network Optimization U.S. Federal Financials Oracle Communications 11.1 Oracle Communications UPK for Pricing Design Center, Voice and Data Offerings Oracle Mobile Workforce 2.1.0 Administrative Setup User Tasks Primavera Primavera Portfolio Management 9.0 UPK CONTENT UPGRADES JDE E1 9.1 HCM Fundamentals for EnterpriseOne Manufacturing - Product Data Management Manufacturing Management Discrete Shop Floor Management Procurement and Subcontract Management JDE World A9.3 Accounts Payable Address Book  Common Foundation General Ledger For a list of modules currently available for each product line, visit the UPK Resource Library on Oracle.com. For more information on how your organization can take advantage of UPK pre-built content, see our previous blog,  The Value of UPK Pre-Built Content. - Karen Rihs, UPK Outbound Product Management

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• Numerical stability in continuous physics simulation

  - by Panda Pajama

  Pretty much all of the game development I have been involved with runs afoul of simulating a physical world in discrete time steps. This is of course very simple, but hardly elegant (not to mention mathematically inaccurate). It also has severe disadvantages when large values are involved (either very large speeds, or very large time intervals). I'm trying to make a continuous physics simulation, just for learning, which goes like this: time = get_time() while true do new_time = get_time() update_world(new_time - time) render() time = new_time end And update_world() is a continuous physical simulation. Meaning that for example, for an accelerated object, instead of doing object.x = object.x + object.vx * timestep object.vx = object.vx + object.ax * timestep -- timestep is fixed I'm doing something like object.x = object.x + object.vx * deltatime + object.ax * ((deltatime ^ 2) / 2) object.vx = object.vx + object.ax * deltatime However, I'm having a hard time with the numerical stability of my solutions, especially for very large time intervals (think of simulating a physical world for hundreds of thousands of virtual years). Depending on the framerate, I get wildly different solutions. How can I improve the numerical stability of my continuous physical simulations?

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• ati graphics always on

  - by naveen

  i use a lenovo y560 and has ubunto 12.04 and win 7 installed when i boot into ubunto i find that the ati car is always on which drains the battery and overheats the system is there any to switch off the ati graphics and use intel hd in ubuntu ati hd 5730 is the graphics card that i use and it has switchable graphics in it. in bios the only two options for video adapter is discrete and switchable after installing ati driver from amd website i am getting a commamd prompt as log in screen first error message comes as Your system is running in low-graphics mode with options to run in low graphics mode this time reconfigure exit all three options i am stuck i need to manually reboot the system

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• what is itunes result sorted by ?

  - by NemesisII

  This is my App on Itunes: http://itunes.apple.com/us/app/buddy-calculator/id445261163?mt=8 My app Key word is : "calculator scientific calc equation math mathematics unit converter conversion statistic algebra" But when I search "Calculator" on Itunes, my app is not appeared (in first two pages). So I want to ask a question that how to improve the rank of my app , and what is the searched result sorted by (new first, vote or downloaded or ...) ? If I want to improve the rank, how can I do, does it cost fee or something ? Thanks you very much ^^ !

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• How to use only intel graphics and power off radeon?

  - by luizrogeriocn

  I've been using Linux for quite a while in everyday computing and programming. But now i got this new laptop with amazing battery life on windows which runs pretty cool even while gaming. But for some reason on Ubuntu I get like 1/3 battery life and it gets hot even while browsing the web. I have the proprietary drivers for radeon, but I'm thinking about upgrading from Ubuntu 12.04 to 14.04, and I would like to know how can I use only the Intel graphics and have radeon always turned off? Since I do not need the discrete graphics on Ubuntu and I'm pretty sure my problem is related to the radeon sucking up my battery and generating heat. My laptop technical specifications are: Dell latitude 3540 Intel core i7 4500U (with Intel hd4400 graphics ) Ati Radeon HD 8850m with 2GB GDDR5 VRAM 8 GB DDR3L @1600mhz Toshiba 256gb SSD Ubuntu 12.4.3 If you need any additional info, please tell me :)

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• why would you use textures that are not a power of 2?

  - by Will

  In the early days of OpenGL and DirectX, it was required that textures were powers of two. This meant that interpolation of float values could be done very quickly using shifting and such. Since OpenGL 2.0, and preceding that via an extension, non-power-of-two texture dimensions has been supported. Are there performance advantages to sticking to power-of-two textures on modern integrated and discrete GPUs? What advantages do non-power-of-two textures have, if any? Are there large populations of desktop users who don't have cards that support non-power-of-two textures?

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• Can I use HDMI with the Intel card of my optimus laptop?

  - by Byakkun

  I have an Dell Inspiron 7110 that has a Sandy bridge i7 and a discrete graphics card (GeForce 525M) from Nvidia. I want to be able to use my 23' display at home throungh hdmi but Intel integrated graphics card does not work with hdmi (VGA is not an option). I have tried bumblebee but it does not work. How could I use the hdmi port for my monitor. Using only the nvidia card with some driver is what I tought i could do but i don't want to give up composing because I use gnome-shell. Any options for doing this?

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• T420 Triple Head with Optimus

  - by Rolo

  I see that this is possible on a T520 apparently (Triple-head on a Lenovo T520), but I can't see anyone claiming it's possible on a T420. I'm running 12.04 and have Bumbleebee installed and working fine but I can't get the display port monitor to display anything. The power light flicks on, but things only render on my VGA output monitor, and Ubuntu's display settings don't detect the third monitor. I'm not concerned with power management, ie, am happy to leave set on discrete graphics in the BIOS if that helps. Is this possible? Thanks.

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• How to prepare for the GRE Computer Science Subject Test?

  - by Maddy.Shik

  How do I prepare for the GRE Computer Science subject test? Are there any standard text books I should follow? I want to score as competitively as possible. What are some good references? Is there anything that top schools like CMU, MIT, and Standford would expect? For example, Cormen et al is considered very good for algorithms. Please tell me standard text books for each subject covered by the test, like Computer Architecture, Database Design, Operating Systems, Discrete Maths etc.

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• Ubuntu 14.04 + nvidia-331-updates makes a blank desktop screen

  - by Achint

  I upgraded my installation from 13.10 to 14.04. The problem is that whenever I install the Nvidia drivers from the GUI, upon reboot or trying to login again it only shows the wallpaper of my desktop and nothing else. The mouse does move around, but nothing works. I am unable to open a terminal or do anything else. If I go into the tty console and purge the drivers, then things seem to work again. I have an Optimus setup, with an onboard Intel and discrete Nvidia GTX770M card. It's a 64-bit architecture. I really need to work with CUDA, and was hopeful after hearing that nvidia-prime was released, but this is a real downer. Any help on this?

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• Record and display Kinect audio and video via avconv

  - by ThomasH

  I'm trying to record audio and video from a Kinect using avconv but I seem to have trouble specifying the right options. avconv -f video4linux2 -video_size 640x480 -c:v h264 -c:a ac3 -i /dev/video1 test.mp4 results in: avconv: /build/buildd/libav-extra-0.8.3ubuntu0.12.04.1/libav/libavutil/mathematics.c:79: av_rescale_rnd: Assertion `c > 0' failed. Aborted (core dumped) Cheese is perfectly happy recording the audio and video from the Kinect, so it's not a setup issue. For added fun, I also need to display the video at the same time.

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• Career Advice: masters degree or work experience [on hold]

  - by user95488

  I graduated about four years ago with a degree in mathematics and I currently work as a Software Developer/Business Analyst, but more Business Analyst. I've been working for about 4 years and and I am concerned with my long term career path. I would strongly prefer to do much more software development but to continue on my current path would lead me to an analyst role. I was thinking of getting a masters in computer science to help refocus my career toward core software development. Does anyone have any advice here? Is this a bad idea?

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• Algorithm development in jobs

  - by dbeacham

  I have a mathematics background but also consider career in some form of software development. In particular I'm interested in finding out what sort of industries are most likely to have more algorithm development/mathematical and logical problem solving slant rather than pure application development etc. Obviously, I'm assuming that some subset of the canonical data structures and associated algorithms (trees, lists, hash tables, sets, maps with search, insert, traversals etc.) are mostly going to be present in software development. However, where am I more likely to encounter problems of more discrete maths nature (combinatorial, graph theory, sets, strings, ...) explicitly or more likely in disguise. Any pointers much appreciated (including possible open source projects that I could use for my further search for applications and also possibly contribute to).

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• Is ROA a specific form of doing SOA?

  - by JohnDoDo

  I have read somewhere that ROA (Resource Oriented Architecture) is SOA (Service Oriented Architecture) with specific constraints added. SOA is the abstract concept of combining discrete pieces of software and ROA is an implementation of SOA with all of the constraints of RESTful services applied to it: SOA = the concept ROA = the concept + specific implementation details I also had my share of posts saying that ROA is different than SOA, then simply fallback to statements like "ROA is REST" and "SOA is SOAP" and presenting the same more or less pertinent comparisons and differences between SOAP and REST. So just to clear up my confusion: Is ROA a specific form of doing SOA?

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• An intern interview with Microsoft [on hold]

  - by Wobbles

  I'm currently in my second year(Computer Science and Mathematics). In two days I have an interview on campus with Microsoft. I'm a bit nervous, because this will be my first in person interview. I have done reviewed basic things like linked list and binary trees. I am not really sure what kinds of questions I'll be asked. Has anyone been to such interview? If so what's it like? What kinds of questions will I be asked? Any help/suggestions will be much appreciated! Also can someone provide me with a list of things I ought to know for the interview?

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• Non-mathematical Project Euler (or similar)?

  - by Juha Untinen

  I checked the post (Where can I find programming puzzles and challenges?) where there's a lot of programming challenges and such, but after checking several of them, they all seem to be about algorithms and mathematics. Is there a similar site for purely logic/functionality-based challenges? For example: - Retrieve data using a web service - Generate output X from a CSV file - Protect this code against SQL injection - Make this code more secure - What is wrong with this code (where the error is in logic, not syntax) - Make this loop more efficient Does a challenge site like that exist? Especially one that provides hints and/or correct solutions. That would be a very helpful learning site.

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