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  • Depth First Search Basics

    - by cam
    I'm trying to improve my current algorithm for the 8 Queens problem, and this is the first time I'm really dealing with algorithm design/algorithms. I want to implement a depth-first search combined with a permutation of the different Y values described here: http://en.wikipedia.org/wiki/Eight_queens_puzzle#The_eight_queens_puzzle_as_an_exercise_in_algorithm_design I've implemented the permutation part to solve the problem, but I'm having a little trouble wrapping my mind around the depth-first search. It is described as a way of traversing a tree/graph, but does it generate the tree graph? It seems the only way that this method would be more efficient only if the depth-first search generates the tree structure to be traversed, by implementing some logic to only generate certain parts of the tree. So essentially, I would have to create an algorithm that generated a pruned tree of lexigraphic permutations. I know how to implement the pruning logic, but I'm just not sure how to tie it in with the permutation generator since I've been using next_permutation. Is there any resources that could help me with the basics of depth first searches or creating lexigraphic permutations in tree form?

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  • MySQL: updating a row and deleting the original in case it becomes a duplicate

    - by Silvio Donnini
    I have a simple table made up of two columns: col_A and col_B. The primary key is defined over both. I need to update some rows and assign to col_A values that may generate duplicates, for example: UPDATE `table` SET `col_A` = 66 WHERE `col_B` = 70 This statement sometimes yields a duplicate key error. I don't want to simply ignore the error with UPDATE IGNORE, because then the rows that generate the error would remain unchanged. Instead, I want them to be deleted when they would conflict with another row after they have been updated I'd like to write something like: UPDATE `table` SET `col_A` = 66 WHERE `col_B` = 70 ON DUPLICATE KEY REPLACE which unfortunately isn't legal in SQL, so I need help finding another way around. Also, I'm using PHP and could consider a hybrid solution (i.e. part query part php code), but keep in mind that I have to perform this updating operation many millions of times. thanks for your attention, Silvio Reminder: UPDATE's syntax has problems with joins with the same table that is being updated

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  • Blogger issue with custom background images on Chrome and Safari

    - by hdx
    This is weird, the site in question is blog.andrebatista.info and it is a hosted at blogger.com. I'm trying to make the blogger template look the same as the one in my main website, www.andrebatista.info. For some reason if I go directly to the blog address Chrome and Safari fail to display all of my background images... all of them. However if I first go to www.andrebatista.info first and then go to the blog it renders just fine ?¿ The way I'm customizing it is by adding a link to my main site's stylesheet at the very end of the head tag on the blogger template. That stylesheet is displayed below: *{ margin:0; padding:0; border:0; } html,body { background:#064169 url(http://www.andrebatista.info/images/main_gradient_slice.jpg) repeat-x; font-family: Arial, "MS Trebuchet", sans-serif; font-size:18px; } #main_wrapper{ margin: 0 auto; width:1024px; } #header{ background: url(http://www.andrebatista.info/images/header.jpg); height:133px; border:none; margin:0; } #menu_wrapper{ background: url(http://www.andrebatista.info/images/menu.jpg); height:34px; overflow:hidden; } #menu_wrapper .menu_item{ color:white; float: left; border: 1 px solid red; height: 34px; padding-top:10px; text-align:center; width:100px; } #menu_wrapper .first{ padding-left:240px; float:left; width:100px; } #menu_wrapper .active,#menu_wrapper .menu_item:hover{ background-color:white; color:Teal; cursor: pointer; } #content_area_wrapper{ background: url(http://www.andrebatista.info/images/body_bg_slice.jpg) repeat-y; } #content_area{ min-height:524px; background: url(http://www.andrebatista.info/images/main_content_top.jpg) repeat-x; } #main_banner{ background: url(http://www.andrebatista.info/images/main_banner.jpg) no-repeat center center; width:662px; height:338px; margin: 0 auto; } #main_banner div{ color:white; padding-left:47px; padding-right:164px; padding-top:105px; } #text_area{ overflow:hidden; width:662px; margin:0 auto; padding:14px; } #contentList{ padding:0 20px 20px 20px; } #text_area .left{ width:50%; float:left; } #text_area .left{ width:50%; float:right; } #footer2{ background: url(http://www.andrebatista.info/images/footer.jpg); height:62px; } #footer{ background: url(http://www.andrebatista.info/images/footer.jpg); height:62px; } Any ideas on what I could be missing?

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  • Visual Studio 2010 SQL Server Database Project - Ignore Stored Procedures and Functions

    - by Carter
    I really like the new SQL Server Database projects in Visual Studio 2010. I also like using the "Generate DROP statements for objects that are in the target database but that are not in the database project" option in the deployment properties. However, I do not want to manage Stored Procedures and Functions using this interface; I have another tool for that. Every time I do a build and deploy, VS will drop my stored procedures that I have created with my external program. I would like to essentially "ignore" stored procedures and functions. Is there a way to ignore stored procedures and functions when building SQL Server Database projects? I won't be able to use the "Generate DROP statements..." option if I want to use my external tool for stored procedures and functions.

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  • Using excel import wizard through code?

    - by baron
    I am creating a Generate Report button for some data in my application. The report will just generate a CSV file, which I then automatically launch in excel. Problem is with one of the data fields, is text and has leading zeroes (which I need to keep). When the file is automatically opened in excel, excel automatically trims these. Is there anyway I can get it so that it opens with the data in the format I want it. I know you achieve this normally by opening the CSV file from within excel and can do the import wizard. So one potential solution would be to auto open the import wizard when the app launches this file. I don't know if this is possible. Thanks for reading.

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  • ldapsearch and vcard creation

    - by Aaron Hoffman
    I'm using openldap on Mac OS X Server 10.6 and need to generate a vcard for all the users in a given group. By using the ldapsearch I can list all the memberUid's for all users in that group. I found a perl script (Advanced LDAP Search or ALS) that was written by someone that will generate the vcard easily. ALS can be found here http://www.ldapman.org/tools/als.gz So what I need to do is create a wrapper script (in python or perl) that will effectively loop through the memberUid's and run the ALS command to create the vcard and append it to the file. This command provides the memberUid's: ldapsearch -x -b 'dc=ldap,dc=server,dc=com' '(cn=testgroup)' Then running ALS gives the vcard: als -b dc=ldap,dc=server,dc=com -V uid=aaronh > vcardlist.vcf If it's easier to do this using Perl since ALS is already using it that would be fine. I've done more work in python but I'm open to suggestions. Thanks in advance, Aaron

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  • Tag/Keyword based recommendation

    - by Hellnar
    Hello I am wondering what algorithm would be clever to use for a tag driven e-commerce enviroment: Each item has several tags. IE: Item name: "Metallica - Black Album CD", Tags: "metallica", "black-album", "rock", "music" Each user has several tags and friends(other users) bound to them. IE: Username: "testguy", Interests: "python", "rock", "metal", "computer-science" Friends: "testguy2", "testguy3" I need to generate recommendations to such users by checking their interest tags and generating recommendations in a sophisticated way. Ideas: A Hybrid recommendation algorithm can be used as each user has friends.(mixture of collaborative + context based recommendations). Maybe using user tags, similar users (peers) can be found to generate recommendations. Maybe directly matching tags between users and items via tags. Any suggestion is welcome. Any python based library is also welcome as I will be doing this experimental engine on python language.

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  • php tree structure problem

    - by agazerboy
    Hi All, I have all my data in my database. It has following 4 columns id source_clust target_clust result_clust 1 7 72 649 2 9 572 650 3 649 454 651 4 32 650 435 This data is like tree structure. source_clust and target_clust generate target_clust. target_clust can be source_clust or target_clust to make a new target_clust. Is there any php function or class that I can use to generate tree structure for my data???? I see this MySql site they are doing exactly what I need but I couldn't find how to implement that query in my data. Thanks !

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  • Vectorizing sums of different diagonals in a matrix

    - by reve_etrange
    I want to vectorize the following MATLAB code. I think it must be simple but I'm finding it confusing nevertheless. r = some constant less than m or n [m,n] = size(C); S = zeros(m-r,n-r); for i=1:m-r for j=1:n-r S(i,j) = sum(diag(C(i:i+r-1,j:j+r-1))); end end The code calculates a table of scores, S, for a dynamic programming algorithm, from another score table, C. The diagonal summing is to generate scores for individual pieces of the data used to generate C, for all possible pieces (of size r). Thanks in advance for any answers! Sorry if this one should be obvious...

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  • Is it possible to create ICriteria/ICriterion from LINQ or HQL?

    - by adrin
    I am creating a method that can create filter understood by NHibernate (by filter i mean a set of ICriteria object for example) from my abstract filter object. public static IEnumerable<ICriterion> ToNhCriteria(this MyCriteria criteria) { // T4 generated function // lots of result.Add(Expression.Or(Expression.Eq(),Expression.Eq)) expression trees - hard to generate // Is there a way to generate HQL/Linq query here istead? } then i want to do something like session.CreateCriteria<Entity>().Add(myCriteria.ToNhCriteria()) to filter entities. The problem is that using Expression. methods (Expression.Or etc) is quite tedious (the method is generated and i have multiple or statements that have to be joined into an expression somehow). Is there a way to avoid using Expression.Or() and create ICrietrion / ICriteria using LINQ or HQL?

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  • In Drupal, how to change the values passed to Pathauto?

    - by Vinicius Pinto
    I have Pathauto configured to generate an alias based on the title of a node, for a specific content type. The problem is that I want to make small changes in this title before Pathauto uses it to generate the alias. The first comment in this post suggests the use of hook_token_values, but I couldn't really understand how to use it, even after reading the docs. In my tests, when I implement this hook, the alias generated is always "array", which means I'm missing something. Any help? Thanks.

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  • C++ - dynamic pointer of array

    - by Eagle
    Hi to all, first i would like to say i am Newbie in C++. As part of my master thesis i am writing a program in C++ which also get as parameters the variables m and d (both integers). Were d is the power of 2 (this means 2^d elements). Parameter m define the number of possible interactions between one element and the total group (2^d elements). The number of possible interactions is computed as following: \kappa = \sum_{i=0}^m\binom{d}{i} (at present i generate vector of vectors for 2^d x \kappa, but my Prof. would like me to create different statistics to different m's. My first though was to to generate a dynamic array of m arrays of different sizes... Then i though of defining a 3-dim array with the biggest needed 2d array, but also program speed is important (e.g d = 20). i would like to ask for your advice how to define such kind of dynamic array that will also be fast. Regards

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  • Password reset by email without a database table

    - by jpatokal
    The normal flow for resetting a user's password by mail is this: Generate a random string and store it in a database table Email string to user User clicks on link containing string String is validated against database; if it matches, user's pw is reset However, maintaining a table and expiring old strings etc seems like a bit of an unnecessary hassle. Are there any obvious flaws in this alternative approach? Generate a MD5 hash of the user's existing password Email hash string to user User clicks on link containing string String is validated by hashing existing pw again; if it matches, user's pw is reset Note that the user's password is already stored in a hashed and salted form, and I'm just hashing it once more to get a unique but repeatable string. And yes, there is one obvious "flaw": the reset link thus generated will not expire until the user changes their password (clicks the link). I don't really see why this would be a problem though -- if the mailbox is compromised, the user is screwed anyway.

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  • System.XML or Regex.Replace?

    - by cam
    I'm generating a large amount of XML documents from a set of values in an Excel file. The only thing that changes for each XML document is the values. I figured the best way to generate these documents was to make a "XML skeleton" (since the XML format never changes) and then plug in symbols like "&%blahNameblahTest", so then I could just preform a Regex.Replace on each value. I will be handing over this project to another developer and I'm wondering if I should convert the project to generate the XML file manually everytime through the System.XML namespace. The only advantages I see to this is ensuring that the XML document is valid. The current method would be more readable than that method, and way faster since I'm generating around 1500 documents.

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  • Build a JavaScript wrapper for a rails-generated XML API?

    - by Thor Thurn
    I am working with a large website written in Ruby on Rails. Thanks to the support for REST in Rails 2, the site's business logic is all accessible via a consistent XML API. Now I want to be able to easily write one or more JavaScript frontends to the site that interact with the generated Rails XML API. Ideally, an automated wrapper for the API could be created in JavaScript, since this would minimize the effort required in writing XML processing code for the more than 500 API functions. How, then, can I automatically generate a wrapper around a given XML API in JavaScript so that it's more pleasant to work with? I've worked with solutions of this nature for Java that generate classes and methods to wrap an API, so my current thinking is that I want something of that nature for JavaScript. I'd be open to an alternative take on the problem, though.

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  • Unit testing a SQL code generator

    - by Tom H.
    The team I'm on is currently writing code in TSQL to generate TSQL code that will be saved as scripts and later run. We're having a little difficulty in separating our unit tests between testing the code generator parts and testing the actual code that they generate. I've read through another similar question, but I was hoping to get some specific examples of what kind of unit test cases we might have. As an example, let's say that I have a bit of code that simply generates a DROP statement for a view, given the view schema and name. Do I just test that the generated code matches some expected outcome using string comparisons and then in a later integration or system test make sure that the drop actually drops the view if it exists, does nothing if the view doesn't exist, or raises an error if the view is one that we are marking as not allowing a drop? Thanks for any advice!

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  • why javascript can not read the cookie in asp.net ?

    - by MemoryLeak
    I want to read the sessionid in cookie which is automatically generated by asp.net. such as ASP.NET_SessionId. but when i use javascript: document.cookie = "ASP.NET_SessionId=;" since i want to set the ASP.NET_SessionId to be empty. but after the javascript executed, i found instead of change the ASP.NET_SessionId to empty, system generate a new cookie with ASP.NET_SessionId equal to empty. why system not modify the cookie but generate a new one ? Thanks!

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  • WPF items not visible when grouping is applied

    - by Tri Q
    Hi, I'm having this strange issue with my ItemsControl grouping. I have the following setup: <ItemsControl Margin="3" ItemsSource="{Binding Communications.View}" > <ItemsControl.GroupStyle> <GroupStyle> <GroupStyle.ContainerStyle> <Style TargetType="{x:Type GroupItem}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type GroupItem}"> <Expander> <Expander.Header> <Grid> <Grid.ColumnDefinitions > <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <TextBlock Text="{Binding ItemCount, StringFormat='{}[{0}] '}" FontWeight="Bold" /> <TextBlock Grid.Column="1" Text="{Binding Name, Converter={StaticResource GroupingFormatter}, StringFormat='{}Subject: {0}'}" FontWeight="Bold" /> </Grid> </Expander.Header> <ItemsPresenter /> </Expander> </ControlTemplate> </Setter.Value> </Setter> </Style> </GroupStyle.ContainerStyle> </GroupStyle> </ItemsControl.GroupStyle> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <TextBlock FontWeight="Bold" Text="{Binding Inspector, Converter={StaticResource NameFormatter}, StringFormat='{}From {0}:'}" Margin="3" /> <TextBlock Text="{Binding SentDate, StringFormat='{}{0:dd/MM/yy}'}" Grid.Row="1" Margin="3"/> <TextBlock Text="{Binding Message }" Grid.Column="1" Grid.RowSpan="2" Margin="3"/> <Button Command="vm:CommunicationViewModel.DeleteMessageCommand" CommandParameter="{Binding}" HorizontalAlignment="Right" Grid.Column="2">Delete</Button> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> In my ViewModel, I expose a CollectionViewSource named 'Communications'. I proceed to adding a grouping patter like so: Communications.GroupDescriptions.Add(new PropertyGroupDescription("Subject")); Now, the problem i'm experience is the grouping work fine, but I can't see any items inside the groups. What am I doing wrong? Any pointers would be much appreciated.

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  • How can i tell jaxb / Maven to genereate multiple schema packages?

    - by M.R.
    Example: </plugin> <plugin> <groupId>org.jvnet.jaxb2.maven2</groupId> <artifactId>maven-jaxb2-plugin</artifactId> <version>0.7.1</version> <executions> <execution> <goals> <goal>generate</goal> </goals> </execution> </executions> <configuration> <schemaDirectory>src/main/resources/dir1</schemaDirectory> <schemaIncludes> <include>schema1.xsd</include> </schemaIncludes> <generatePackage>schema1.package</generatePackage> </configuration> </plugin> <plugin> <groupId>org.jvnet.jaxb2.maven2</groupId> <artifactId>maven-jaxb2-plugin</artifactId> <version>0.7.1</version> <executions> <execution> <goals> <goal>generate</goal> </goals> </execution> </executions> <configuration> <schemaDirectory>src/main/resources/dir2</schemaDirectory> <schemaIncludes> <include>schema2.xsd</include> </schemaIncludes> <generatePackage>schema2.package</generatePackage> </configuration> </plugin> </plugins> What happened: Maven executes the the first plugin. Then deletes the target folder and creates the second package, which then is visible. I tried to set target/somedir1 for the first configuration and target/somedir2 for the second configuration. But the behavior does not not change? Any ideas? I do not want to generate the packages directly in the src/main/java folder, because these packages are genereated and should not be mixed with manual created classes.

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  • How to set parameters in Python zlib module

    - by fagricipni
    I want to write a Python program that makes PNG files. My big problem is with generating the CRC and the data in the IDAT chunk. Python 2.6.4 does have a zlib module, but there are extra settings needed. The PNG specification REQUIRES the IDAT data to be compressed with zlib's deflate method with a window size of 32768 bytes, but I can't find how to set those parameters in the Python zlib module. As for the CRC for each chunk, the zlib module documentation indicates that it contains a CRC function. I believe that calling that CRC function as crc32(data,-1) will generate the CRC that I need, though if necessary I can translate the C code given in the PNG specification. Note that I can generate the rest of the PNG file and the data that is to be compressed for the IDAT chunk, I just don't know how to properly compress the image data for the IDAT chunk after implementing the initial filtering step.

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  • How to overcome an apparent REST vs. DRY dilemma in rails?

    - by Chris
    A rails app I'm working on features examples of quadratic equations. Obviously, these are all of a common structure: ax^2 + bx + c = 0. I don't want to store every single example of these. I'd rather generate them from a template. Storing hundreds of possible versions of this structure seems highly wasteful and un-DRY. On the other hand, if I generate them, I can't access them again reliably as I could if they were simply multiple database objects. I'm sure there must be a way to overcome this, but I'm still learning rails and I'm obviously not grasping something here. Thanks.

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