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• How can I find the closest vector to another in a specific direction?

  - by Sniper

  Perhaps I am not phrasing it incorrectly in my searches, but I can not find anything on this. I have a vector3 with a specific direction that it is facing, I want to get the closest object to that position in that specific direction. Basically I want to get the object that is being aimed at. I have thought about finding all objects within a box and then finding the closest object to my vector from them results, but I am sure that there is a more efficient way. The Z axis is optional, the objects are most likely within a few meters of the search vector. http://i.stack.imgur.com/FafAu.jpg

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• Calculate volume based on STL file

  - by plancake

  Just wondering if anyone had a simple, efficient way of calculating the volume of a stereolithographic file (STL)? And rendering this in a Windows Form Control?

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• Compare NSArray with NSMutableArray adding delta objects to NSMutableArray

  - by Hooligancat

  I have an NSMutableArray that is populated with objects of strings. For simplicity sake we'll say that the objects are a person and each person object contains information about that person. Thus I would have an NSMutableArray that is populated with person objects: person.firstName person.lastName person.age person.height And so on. The initial source of data comes from a web server and is populated when my application loads and completes it's initialization with the server. Periodically my application polls the server for the latest list of names. Currently I am creating an NSArray of the result set, emptying the NSMutableArray and then re-populating the NSMutableArray with NSArray results before destroying the NSArray object. This seems inefficient to me on a few levels and also presents me with a problem losing table row references which I can work around, but might be creating more work for myself in doing so. The inefficiency seems to be that I should be able to compare the two arrays and end up with a filtered NSArray. I could then add the filtered set to the NSMutableArray. This would mean that I can simply append new data to the NSMutableArray instead of throwing everything out and re-populating. Conversely I would need to do the same filter in reverse to see if there are records that need removing from the NSMutableArray. Is there any method to do this in a more efficient manner? Have I overlooked something in the docs some place that refers to a simpler technique? I have a problem when I empty the NSMutableArray and re-populate in that any referencing tables lose their selected row state. I can track it and re-select it, but my theory is that using some form of compare and adding objects and removing objects instead of dealing with the whole array in one block might mean I keep my row reference (assuming the item isn't deleted of course). Any suggestions or help much appreciated. Update Would it be just as fast to do a fast enumeration over each comparing each line item as I go? It seems like an expensive operation, but with the last fast enumeration code it might be pretty efficient...

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• iterator vs reverse_iterator

  - by Miguel Angel

  Hi, I'm using std::map to store a lot of elements (pairs of elements) and I have a "little" doubt, what is more efficient to iterate all elements over my std::map, iterator or reverse_iterator? Thank's. Salu2.

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• Alternative for my preg_replace code

  - by Ben Sinclair

  Here is my code... basically it finds any page-NUMBER- within a variable and then replaces it with a page url from an array $content_text = preg_replace("/page-(\d+)-/sie", '$pageurl[$1]', $content_text); It works a treat until the NUMBER it finds isn't in the array and it returns an error... Is there another efficient way I could do this instead? I liked my code above because it was simple but I may have to use more complex code...

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• customized StringFormat in WPF DataGrid

  - by Boris Lipschitz

  What would be the most efficient way to set customized formatting of the column in DataGrid. I can't use the following StringFormat, as my sophisticated formatting also depends on some other property of this ViewModel. (e.g Price formatting has some complicated formatting logic based on different markets.) Binding ="{Binding Price, StringFormat='{}{0:#,##0.0##}'}"

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• PyGTK: Packing widgets before tabs in a gtk.Notebook

  - by Ben Ashton

  Basically, what I want to do is put some buttons before the tabs in a gtk.Notebook. I tried making my own notebook type widget and it worked well, but it would have required lots more work to make it as flexible as I would like, also it wasn't as efficient. Here is a mock-up of what I'm trying to achieve: http://imagebin.ca/view/84SC0d.html Any ideas would be much appreciated, thanks. Ben.

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• How can I call winrar in perl on windows

  - by perlnoob

  Is it possible to call winrar through perl on a windows system, such as perl -e "rar a -rr10 -s c:\backups\backup.rar @backup.lst" If so, is there a more efficient way to do this? I've looked up "perl -e" +winrar on google, however none of the results gave me any answer that was remotely close to what i was looking for. The system Im running this on is a Windows XP system. Im open to doing this in another language like python if its easier, however I am more comfertable with perl.

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• Setting ModelView matrix using rotate, translate, etc.. vs setting manual matrix

  - by guymic

  When setting the ModelView matrix you normally go through several transformations from the identity matrix. for example: glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef(270.0f, 0.0f, 0.0f, 1.0f); glTranslatef(-rect.size.height / 2, -rect.size.width / 2, 0.0f); Instead of doing those operations one after the other (assume there are more than two), wouldn't it be more efficient to simply pre-calculate the resulting matrix and set the ModelView matrix to this manual matrix?

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• SOQL Pagination for Salesforce API queries

  - by Daniel Ballinger

  Is there an efficient way to page through results from a SOQL query without bringing all the query results back and then discarding the majority of them? As an example, I'd like to be able to to page through the complete list of contacts showing 10 records at a time. I don't have the need to sort by any particular field.

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• append set to another set

  - by mr.bio

  Hi Is there a better way of appending a set to another set than iterating through each element ? i have : set<string> foo ; set<string> bar ; ..... for (set<string>::const_iterator p = foo.begin( );p != foo.end( ); ++p) bar.insert(*p); Is there a more efficient way to do this ?

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• Neural Net Optimize w/ Genetic Algorithm

  - by ServAce85

  Is a genetic algorithm the most efficient way to optimize the number of hidden nodes and the amount of training done on an artificial neural network? I am coding neural networks using the NNToolbox in Matlab. I am open to any other suggestions of optimization techniques, but I'm most familiar with GA's.

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• How to refresh an Android RelativeLayout when orientation changes without restarting the Activity?

  - by johnrock

  I have an Android Activity with a RelativeLayout and I have implemented the following method to prevent the activity from being recreated on change of Orientation: @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); } I am obviously not doing anything in this method, but it worked perfect when using a LinearLayout. Now however, using RelativeLayout, my layout is all messed up when changing to landscape orientation. What is the most efficient way to have the screen redraw correctly without having the activity restarted again with a call to onCreate?

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• Read Lines between a start index and end index in java

  - by HonorGod

  Lets say I have 10 lines in a file. I have 2 parameters that specify the beginning and ending of a index. StartIndex = 2 // specifies the first 2 lines EndIndex = 3 // specifies the last 3 lines I need to read the lines in between. I know maintaining index and skipping is one of the ways...but are there any other efficient ways (even with external libraries)? Thanks

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• Android: how to place a button at an x,y position over top of Canvas

  - by Ben Mc

  Is it possible to place buttons at an X,Y position over the top of a Canvas? For example, on the opening screen of my game, I would like to place buttons for "Play Now", "Instructions", etc, right on top of the canvas. Right now, I'm looking at Touch locations on the Canvas and comparing them to various X,Y bounds. It works, but adding a button with a click listener would probably be much more efficient.

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• Java properties - .properties files vs xml?

  - by pg-robban

  I'm a newbie when it comes to properties, and I read that XML is the preferred way to store these. I noticed however, that writing a regular .properties file in the style of foo=bar fu=baz also works. This would mean a lot less typing (and maybe easier to read and more efficient as well). So what are the benefits of using an XML file?

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• SQL is this equvelent to a LEFT JoIn?

  - by Jim

  Is this equvelent to a LEFT JOIN? select distinct a.name, b.name from tableA a, (select name from tableB) as b It seems as though there is no link between the two tables. Is there an easier / more efficient way to write this?

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• SQL last day in moth select

  - by Saif Khan

  I have the following table which is basically the summary of daily transactions and is loaded nightly. +++++++++++++++++++++++ + DateCreated + Sale + +++++++++++++++++++++++ + 20100101 + 1000 + + 20100131 + 2000 + + 20100210 + 2000 + + 20100331 + 4000 + +++++++++++++++++++++++ I need to display the sale by month, but only for the last day in each month. eg JAN 2000 FEB 0 MAR 4000 I could probably accomplish this with CASE in my select, but is this efficient? This is SQL Server 2000.

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• Get entry by week number using Django ORM?

  - by e-satis

  I tried something like: MyModel.objects.filter(year__week=1) It doesn't work. For now, I calculate the first day and the last day of the week and then use gte and lte, but it's less than efficient given that SQL comes with a Week function.

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• easiest to code algorithm for rubik's cube

  - by kokokok

  edit : I should rephrase this,what would be a relatively easy algorithm to code in java for solving a rubik's cube. Efficiency is also important but a secondary consideration. orig : what is the easiest algorithm to code for solving a rubik's cube? it could be the least efficient but I am looking for something easy to code right now

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• building web page content filter

  - by radi

  i want to build a filter to block pornography sites so i have some questions : what tools i need ? what are the algorithms i have to use ? (speed , efficient ) where i can find an open source filter ? and i want to use java . thanks

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• Sharing css/javascript/images between different projects in Visual Studio

  - by gnomixa

  I can't seem to figure out the most efficient way to do this. For example, I have some js files that are needed in both projects(within the same solution), how do I include them without duplicating the actual physical files, which I would rather not do? Same goes for images and css files. Any ideas?

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• Python most common element in a list

  - by Richard

  What is an efficient way to find the most common element in a Python list? My list items may not be hashable so can't use a dictionary. Also in case of draws the item with the lowest index should be returned. Example: >>> most_common(['duck', 'duck', 'goose']) 'duck' >>> most_common(['goose', 'duck', 'duck', 'goose']) 'goose'

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• Quickest way to find the oldest file in a directory using Delphi

  - by Pieter van Wyk

  HI We have a large number of remote computers that capture video onto disk drives. Each camera has it's own unique directory and there can be up to 16 directories on any one disk. I'm trying to locate the oldest video file on the disk but using FindFirst/FindNext to compare the File Creation DateTime takes forever. Does anybody know of a more efficient way of finding the oldest file in a directory? We remotely connect to the pc's from a central HO location. Regards, Pieter

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• a good book about software design

  - by Idan

  i'm looking for a book that talks about sofware decision like : when should i use thread pool and shouldn't. and in the first case, explains how. how should i acess my DB , how big my transactions should be how to read XML, to use DOM or SAX, what library to choose, and best ways to parse how to handle client-server app best efficient way and more stuff like that. is a book like that exist ? (preferably in c++ but not that important)

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