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• How to implement HeightMap smoothing using Thrust

  - by igal k

  I'm trying to implement height map smoothing using Thrust. Let's say I have a big array ( around 1 million floats). A known graphics algorithm to implement the above problem is to calculate the average around a given cell. If for example I need to calculate the value at a given cell[i,j] what I will basically do is: cell[i,j] = cell[i-1,j-1] + cell[i-1,j] + cell[i-1,j+1] + cell[i,j-1] + cell[i,j+1] + cell[i+1,j -1] + cell[i+1,j] + cell[i+1,j+1] cell[i,j] /=9 That's the CPU code. Is there a way to implement it using thrust? I know that I could use the transform algorithm. But I'm not sure it's correct to access different cells which are occupied but different threads (banks conflicts and so on).

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• Tips for improving performance of DB that is above size 40 GB (Sql Server 2005) and growing monthly

  - by HotTester

  The current DB or our project has crossed over 40 GB this month and on an average it is growing monthly by around 3 GB. Now all the tables are best normalized and proper indexing has been used. But still as the size is growing it is taking more time to fire even basic queries like 'select count(1) from table'. So can u share some more points that will help in this front. Database is Sql Server 2005. Further if we implement Partitioning wouldn't it create a overhead ? Thanks in advance.

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• How can I implement lazy loading on a page with 500+ images?

  - by Fedor

  I basically have a booking engine unit results page which must show 40 units and per each unit there's 1 large image of the first thumbnail and an X number of accompanying thumbnail images. I've been using the jquery lazy load plugin, but it's not thorough enough ( I'm invoking it on DOM Ready ), plus it doesn't really work in IE ( 50% of the clients use IE so it's a big issue ). What I think I really need to do is not really spit out the image but a fake element such as a span, and possibly modify my code such that if the user views the span, render it into an image element. <span src="/images/foo.gif"> The booking engine relies on JS so I think I might be forced to just rely on ajaxifying all the thumbnails and have event handlers on window scroll, etc in order for the page to be "usable" and load at an average time ( 2-3 seconds instead of 5-30s on high speed DSL/Cable ). I'd appreciate any examples or ideas.

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• BCB: how to get the (approximate) width of a character in a given TFont?

  - by mawg

  It's a TMemo, not that that should make any difference. Googling suggests that I can use Canvas->TextWidth() but those are Delphi examples and BCB doesn't seem to offer this property. I really want something analogous to memo->Font->Height for width. I realize that not all fonts are fixed width, so a good estimate will do. All that I need is to take the width of a TMemo in pixels and make a reasonable guess at how many characters of the current font it will hold. Of course, if I really want to be lazy, I can just google for the average height/width ratio, since height is known. Remember, an approximation is good enough for me if it is tricky to get exact. http://www.plainlanguagenetwork.org/type/utbo211.htm says, " A width to height ratio of 3:5 (0.6) is recommended for most applications"

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• How to change the range of a chart in Excel using VBA?

  - by Pieter

  Hi guys, I'm using an Excel sheet to keep track of a particular time series (my daily weight, if you must know). I created a macro that inserts a row, automatically adds today's date and calculates a moving average based on my input. There is also a chart to visualize my progress. I have tried recording a macro that updates the time series in the graph, but to no success. How can I create a macro or VBA script that, when executed, updates the range of the graph from A(x):Cy to A(x-1):Cy to include today's measurement? Thanks!

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• Is a switch statment ok for 30 or so conditions?

  - by DeanMc

  I am in the final stages of creating an MP4 tag parser in .Net. For those who have experience with tagging music you would be aware that there are an average of 30 or so tags. If tested out different types of loops and it seems that a switch statement with Const values seems to be the way to go with regard to catching the tags in binary. The switch allows me to search the binary without the need to know which order the tags are stored or if there are some not present but I wonder if anyone would be against using a switch statement for so many conditionals. Any insight is much appreciated.

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• Where are graphically pleasing examples of Lists

  - by slim

  Anyone know of good code examples of how to make lists look different than your everyday average black list or more graphically pleasing than you usually see in android apps. I've looked through google code but haven't found too many. I'm looking for different and eye catching lists. I hope this question isn't too generic. Also i'm open to anything, code, examples, blog posts, etc, you name it. I've really struggled with lists and making them look more snazzy. I'm talking more the code level not the graphics or icons used.

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• PHP 2d array question

  - by Neral

  Hello, So i have a 2 dimensional array that is used over several pages (session) $_SESSION ["Table"][$_SESSION ["count"]] [0] = $filename; $_SESSION ["Table"][$_SESSION ["count"]] [1] = $size; $_SESSION ["Table"][$_SESSION ["count"]] [2] = $floor; $_SESSION ["Table"][$_SESSION ["count"]] [3] = $phone; $_SESSION ["Table"][$_SESSION ["count"]] [4] = $network; $_SESSION ["Table"][$_SESSION ["count"]] [5] = $totalprice; This is used with a form so i can give in multiple input wich gets stored. But my question is how exactly can i calculate the AVERAGE of $total price of all given in results? Meaning for example i have 5 rows so this would mean 5 total prices. How exactly can i acces this value and count everything up / 5? This will happen in a other page so i would like to use sessions for this. /5 simply by count($_Session["table"]) , but really not sure about the other values. Kind Regards.

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• Jquery slider with gradscales

  - by Karthik

  hi folks I am using this jquery ui for the slider.here i want the gradscale like poor----excellecnt-------average------good how do this in this script? <script src="../../Scripts/jquery.ui.core.js" type="text/javascript"></script> <script src="../../Scripts/jquery.ui.widget.js" type="text/javascript"></script> <script src="../../Scripts/jquery.ui.mouse.js" type="text/javascript"></script> <script src="../../Scripts/jquery.ui.slider.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { $("#slider").slider(); }); </script>

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• "Introduction to Computer Science and Programming" for a beginner.

  - by Richard

  Hi everyone! Im new here and also new to developing software and programming, and with new I mean 0 experience or schooling for it. As Im currently studying medicine via internet and I use a computer on an average of about 8-9 hours a day, this has lead me to get very interested in programming. I got a link from a fellow Redditor and I got some questions before I dive into this project. http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-00Fall-2008/CourseHome/index.htm Is this too much/hard for a beginner? Is Python™ programming language the way to go or would I be better off learning some other kind of language to begin with? What other ways of learning basic programming by myself is there? Are there any better ways for a complete beginner to start off? Thank you for your time!

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• How long can a hash left out in the open be considered safe?

  - by Xeoncross

  If I were to leave a SHA2 family hash out on my website - how long would it be considered safe? How long would I have before I could be sure that someone would find a collision for it and know what was hashed? I know that the amount of time would be based on the computational power of the one seeking to break it. It would also depend on the string length, but I'm curious just how secure hashes are. Since many of us run web-servers we constantly have to be prepared for the day when someone might make it all the way to the database which stores the user hashes. So, move the server security out of the way and then what do you have? This is a slightly theoretical area for many of the people I have talked with, so I would love to actually have some more information about average expectations for cracking.

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• Python: Control timeout length

  - by skylarking

  I have code similar to the following running in a script: try: s = ftplib.FTP('xxx.xxx.xxx.xxx','username','password') except: print ('Could not contact FTP serer') sys.exit() IF the FTP site is inaccessible, the script almost seems to 'hang' ... It is taking about 75 seconds on average before sys.exit() appears to be called... I know the 75 seconds is probably very subjective, and dependent on the system this runs on...but is there a way to have python just try this once, and if unsucessful, to exit immediately? The platform I am using for this is Mac OS X 10.5/python 2.5.1.

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• Ideas for band site, which technology to use?

  - by brux

  I am attempting to design and build a website for my friends band. There is minimal content to be included such as bio,news,enbemdded Audio/Visual material. My web dev expertise is average. I'm basicaly looking for inspiration, I was edging towards embedding a silverlight deepzoom xap object to add some visual stimulation, perhaps by featuring a high res photo of the bandshardware/equipment which zooms when mouseover occurs. Does anyone have any cool ideas for a central feature for this site, and which way to approact it in terms of technique (js,css,silverlight etc) If anyone has any immediate ideas which they think would be cool then I am eager to hear them! Also if anyone can link me to any cool band sites they have come across recently I would be greatful,nothing too complicated though please I will be doing all the work myself. Im want the site to be simple but have a certain wow factor!

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• PHP speed optimisation.

  - by Petah

  Hi, Im wondering about speed optimization in PHP. I have a series of files that are requested every page load. On average there are 20 files. Each file must be read an parsed if they have changed. And this is excluding that standard files required for a web page (HTML, CSS, images, etc). EG - client requests page - server outputs html, css, images - server outputs dynamic content (20+/- files combined and minified). What would be the best way to serve these files as fast as possible?

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• linux cpu usage

  - by davidbobo

  I am working on unix. I want to knwo the current cpu usage of a process. I understood that ps give the average of cpu used till the process is up - it is not the current usage. Is there a way to print only the cpu from the top command without 10 more parameters and headers? I know how to do it with awk - this is not the way i want to do it. top -p 20705 -bc -n 1 | tail -n 2 | awk '{ print $9}' | head -n 1 If there is another simple way to do it, not reading /proc/stat... If there is a simple way doing it from c++, it is also ok.

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• Making dynamic images have static filenames

  - by michaeltk

  My website currently has various links to a php script that generates the images dynamically. For example, the link may say "img source="/dynamic_images.php?type=pie-chart&color=red" Obviously, this is not great for SEO. I'd like to somehow make the filenames of these links appear to be static, and use a solution (like Mod-Rewrite) to ensure that the images can still be dynamically created. I suppose I could have something like "img src="average-profits-in-scuba-diving-industry.png?type=pie-chart&color=red" (and use Mod-Rewrite to take care of changing the filename prefix to dynamic_images.php), but I'm afraid that the search engines would shy away from the querystring on the end of the image filename. Any solutions? Thanks in advance.

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• Complexity in using Binary search and Trie

  - by user121196

  given a large list of alphabetically sorted words in a file,I need to write a program that, given a word x, determines if x is in the list. Preprocessing is ok since I will be calling this function many times over different inputs. priorties: 1. speed. 2. memory I already know I can use (n is number of words, m is average length of the words) 1. a trie, time is O(log(n)), space(best case) is O(log(n*m)), space(worst case) is O(n*m). 2. load the complete list into memory, then binary search, time is O(log(n)), space is O(n*m) I'm not sure about the complexity on tri, please correct me if they are wrong. Also are there other good approaches?

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• Fastest algorithm to check if a number is pandigital?

  - by medopal

  Pandigital number is a number that contains the digits 1..number length. For example 123, 4312 and 967412385. I have solved many Project Euler problems, but the Pandigital problems always exceed the one minute rule. This is my pandigital function: private boolean isPandigital(int n){ Set<Character> set= new TreeSet<Character>(); String string = n+""; for (char c:string.toCharArray()){ if (c=='0') return false; set.add(c); } return set.size()==string.length(); } Create your own function and test it with this method int pans=0; for (int i=123456789;i<=123987654;i++){ if (isPandigital(i)){ pans++; } } Using this loop, you should get 720 pandigital numbers. My average time was 500 millisecond. I'm using Java, but the question is open to any language.

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• [MySQL, InnoDb] Rating place

  - by Pavel

  I'm trying to generate rating place table using following receipt http://stackoverflow.com/questions/1776821/assign-places-in-the-rating-mysql-php but my database is high loaded. I tried not to create table, but use MEMORY TABLE and update it using following SQL query insert into tops (uid) select uid from users order by exp desc; but got the following MySQL error Deadlock found when trying to get lock; try restarting transaction because there are too many queries until SQL select is being executed. How to solve this problem? P.S. CREATE TABLE tops as SELECT work almost fine except high server load... up to load average: 50 if tops are non-memory table. My table users has near 4.5 millions of rows. Thanks for any advices.

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• Get averages from pre-aggregated reports in mongodb

  - by Chris

  I've got a database with pre-aggregated metrics similar to the one outlined in this use case: http://docs.mongodb.org/manual/use-cases/pre-aggregated-reports/ I have a daily collection with a subdocument for hour and minute metrics, and a 'metadata.date' entry for midnight on the day it represents. I also have a monthly collection with a day subdocument for each day. If I want to get an average of a metric over the past eight or so days how can I do that with the aggregation framework? Is the aggregation framework not the right tool for this since it's already pre-aggregated?

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• Image processing custom filter 7 by 7

  - by ladiesMan217

  Lets say I have a 7 by 7 neighborhood around a pixel that looks like this 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 and I wanna filter the above by replacing the pixel p by the average of those pixels whose value lie in the range -10<=p_value <=10. I am new to image processing and I think in this case p_value is 25 and around 25 that are many pixel values in that range but don't exactly know to construct a convolution filter out of it.

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• Use LINQ to insert data from dataset to SQL

  - by Mayo

  Let's say I have a dataset in an ASP.NET website (.NET 3.5) with 5 tables, each has roughly 30,000 rows and an average of 12 columns. I want to insert all of the data from the dataset into 5 very-similar-but-not-quite-identical tables in SQL Server 2008. I also want to use LINQ (personal preference - trying to learn something new). Is it as simple as iterating through the dataset and, for each row, creating a new instance of the associated class, initializing its data with the dataset's row, adding it to the data model, and then doing one giant SubmitChanges at the end? Are there better ways of doing this with LINQ? Or is this the de-facto standard?

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• Comparing 2 linq applications: Unexpected result

  - by lukesky

  I drafted 2 ASP.NET applications using LINQ. One connects to MS SQL Server, another to some proprietary memory structure. Both applications work with tables of 3 int fields, having 500 000 records (the memory structure is identical to SQL Server table). The controls used are regular: GridView and ObjectDataSource. In the applications I calculate the average time needed for each paging click processing. LINQ + MS SQL application demands 0.1 sec per page change. LINQ + Memory Structure demands 0.8 sec per page change. This Is shocking result. Why the application handling data in memory works 8 times slower than the application using hard drive? Can anybody tell me why that happens?

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• Aggregation over a few models - Django

  - by RadiantHex

  Hi folks, I'm trying to compute the average of a field over various subsets of a queryset. Player.objects.order_by('-score').filter(sex='male').aggregate(Avg('level')) This works perfectly! But... if I try to compute it for the top 50 players it does not work. Player.objects.order_by('-score').filter(sex='male')[:50].aggregate(Avg('level')) This last one returns the exact same result as the query above it, which is wrong. What am I doing wrong? Help would be very much appreciated!

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• Needed inputs for helping hospitals/practices save money on mandatory compliance Policies and Course

  - by user363414

  Recently one of my clients came up to me and asked "Is there any way we can save some money on mandatory compliance policies and courses, and I started wondering what can I do? I started creating a calculator to show some savings if they used elearning. I wanted your input to validate that data. How many Policies your practice/hospital need to sign and average number of pages per policy? Also how many employees need to sign these policies? This would be really helpful and once I have this done I will send a copy to you as well.

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