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Articles indexed Monday April 12 2010

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  • Python: deleting rows in a text file

    - by Jenny
    A sample of the following text file i have is: > 1 -4.6 -4.6 -7.6 > > 2 -1.7 -3.8 -3.1 > > 3 -1.6 -1.6 -3.1 the data is separated by tabs in the text file and the first column indicates the position. I need to iterate through every value in the text file apart from column 0 and find the lowest value. once the lowest value has been found that value needs to be written to a new text file along with the column name and position. Column 0 has the name "position" Column 1 "fifteen", column 2 "sixteen" and column 3 "seventeen" for example the lowest value in the above data is "-7.6" and is in column 3 which has the name "seventeen". Therefore "7.6", "seventeen" and its position value which in this case is 1 need to be written to the new text file. I then need a number of rows deleted from the above text file. E.G. the lowest value above is "-7.6" and is found at position "1" and is found in column 3 which as the name "seventeen". I therefore need seventeen rows deleted from the text file starting from and including position 1 so the the column in which the lowest value is found denotes the amount of rows that needs to be deleted and the position it is found at states the start point of the deletion

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  • MVC: Model View Controller -- does the View call the Model?

    - by Gary Green
    I've been reading about MVC design for a while now and it seems officially the View calls objects and methods in the Model, builds and outputs a view. I think this is mainly wrong. The Controller should act and retrieve/update objects inside the Model, select an appropriate View and pass the information to it so it may display. Only crude and rudiementary PHP variables/simple if statements should appear inside the View. If the View gets the information it needs to display from the Model, surely there will be a lot of PHP inside the View -- completely violating the point of seperating presentation logic.

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  • iptables : how to allow incoming ftp traffic?

    - by logansama
    Hi, Still fighting my way through the jungle that is called iptables. I have managed to allow FTP access outside of our LAN: both these would work. NOTE: eth0 is the LAN interface and eth1 is the WAN interface. iptables -t filter -A FORWARD -i eth0 -p tcp --dport 20:21 -j ACCEPT or iptables -A FORWARD -i eth0 -o eth1 -p tcp --sport 20:21 --dport 1024:65535 -j ACCEPT But when i connect to a external FTP server i manage to log in and all is fine until it wishes to List the directory content. Then nothing happens as the data is blocked, due to the fact that i do not have a rule set up to allow it! (my last rule on the FORWARD chain is to block all traffic) I have tried a gazillion rules (many of which i did not understand) to try and allow the FTP traffic back through my server. One such rule for example was: iptables -A FORWARD -i eth1 -o eth0 -p tcp --sport 20:21 --dport 1024:65535 -j ACCEPT But i cannot get the List to work. It just times out after a while. Would anyone perhaps know how to build a rule which would allow FTP to List / allow such traffic back? Or have a link to sources i could work through? Thank you,

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  • How do you think while formulating Sql Queries. Is it an experience or a concept ?

    - by Shantanu Gupta
    I have been working on sql server and front end coding and have usually faced problem formulating queries. I do understand most of the concepts of sql that are needed in formulating queries but whenever some new functionality comes into the picture that can be dont using sql query, i do usually fails resolving them. I am very comfortable with select queries using joins and all such things but when it comes to DML operation i usually fails For every query that i never done before I usually finds uncomfortable with that while creating them. Whenever I goes for an interview I usually faces this problem. Is it their some concept behind approaching on formulating sql queries. Eg. I need to create an sql query such that A table contain single column having duplicate record. I need to remove duplicate records. I know i can find the solution to this query very easily on Googling, but I want to know how everyone comes to the desired result. Is it something like Practice Makes Man Perfect i.e. once you did it, next time you will be able to formulate or their is some logic or concept behind. I could have get my answer of solving above problem simply by posting it on stackoverflow and i would have been with an answer within 5 to 10 minutes but I want to know the reason. How do you work on any new kind of query. Is it a major contribution of experience or some an implementation of concepts. Whenever I learns some new thing in coding section I tries to utilize it wherever I can use it. But here scenario seems to be changed because might be i am lagging in some concepts.

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  • Nested Data XML design

    - by esryl
    Looking to nest (to unlimited levels) elements in XML. Like so: <items> <item> <name>Item One</name> <item> <name>Item Two</name> </item> <item> <name>Item Three</name> <item> <name>Item Four</name> </item> <!-- etc... --> </item> </item> </items> However. While browsing for a solution I noticed in the comments of: http://stackoverflow.com/questions/988139/weird-nesting-in-xml while the above is well formed it would not validate against any sinsible DTD. Two things, what is a better way of nesting similar elements, and secondly what would be the design of the DTD. UPDATE: Would prefer to validate against an XML Schema rather than DTD.

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  • Rails helper module undefined method `sort'

    - by Magicked
    I'm trying to create a simple helper module in rails, and I'm stumped on the following error message from my new person form (app/views/people/new.html.erb): undefined method `sort' for 97:Fixnum Extracted source (around line #17): 14: <p> 15: <% nations = { 'United States of America' => 'USA', 'Canada' => 'Canada', 'Mexico' => 'Mexico', 'United Kingdom' => 'UK' } %> 16: <%= f.label :country %><br /> 17: <%= radio_buttons(:person, :country, nations) %> 18: 19: </p> 20: <p> radio_buttons is a helper module I have created for my view. Here it is (app/helpers/people_helper.rb): module PeopleHelper def radio_buttons(model_name, target_property, button_source) html='' list = button_source.sort list.each do |x| html << radio_buttons(model_name, target_property, x[1]) html << h(x[0]) html << '<br />' end return html end end The problem appears to be on the "list = button_source.sort", but I'm not sure why it says the method is undefined. I have been able to use it directly within my view code. Am I not able to use methods like this within helper modules? Do I need to include something? Thanks for any help!

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  • Getting Stage from within a loaded SWF

    - by Fahim Akhter
    Hi, For the scenario lets consider Car to be the highest SWF(stage) inside I load tyres. Inside tires I have rims. Now if the rims need to be positioned relative to the stage (car body) how can I do that? Inside rims if I write stage and load it results in an error. Any Ideas?

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  • ArrayList and Map problem in grails

    - by xain
    Hi, I have a service that contains a map: static Map cargosMap = ['1':'item1','2':'item 2','3':'item 3'] that is returned via a method in the service: static Map getCargos() { [cargosMap] } A controller calls it like this: def mform = { Map cargos = empService.getCargos() [cargos:cargos] } In the gsp, I have the select: <g:select name="cg1" from="${cargos}" /> But I'm getting the exception: Error 500: Executing action ....caused exception: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object ... with class 'java.util.ArrayList' to class 'java.util.Map' Any clues ? Thanks

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  • writing a web service with dynamically determined web methods

    - by quillbreaker
    Let's say I have a text file of basic mathematical functions. I want to make a web service that answers these mathematical functions. Say the first one is y=x*x. If I wanted to turn this into a web service, I could simply do this: [WebMethod] public int A(int x) { return x*x; } However, I've extracted the function from the list by hand and coded it into a function by hand. That's not what I want to do. I want the wsdl for the service to be generated at call time directly from the text file, and I want the web method calls to the service to go to a specific method that also parses the text file at run time. How much heavy lifting is this? I've found a sample on how to generate WSDLs dynamically at this link, but there's a lot more to do beyond that and I don't want to bark up this tree if there are parts of the project that arn't feasible. Does anyone have any links, guides, books, or positive experiences trying this kind of thing?

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  • Designing different Factory classes (and what to use as argument to the factories!)

    - by devoured elysium
    Let's say we have the following piece of code: public class Event { } public class SportEvent1 : Event { } public class SportEvent2 : Event { } public class MedicalEvent1 : Event { } public class MedicalEvent2 : Event { } public interface IEventFactory { bool AcceptsInputString(string inputString); Event CreateEvent(string inputString); } public class EventFactory { private List<IEventFactory> factories = new List<IEventFactory>(); public void AddFactory(IEventFactory factory) { factories.Add(factory); } //I don't see a point in defining a RemoveFactory() so I won't. public Event CreateEvent(string inputString) { try { //iterate through all factories. If one and only one of them accepts //the string, generate the event. Otherwise, throw an exception. return factories.Single(factory => factory.AcceptsInputString(inputString)).CreateEvent(inputString); } catch (InvalidOperationException e) { throw new InvalidOperationException("No valid factory found to generate this kind of Event!", e); } } } public class SportEvent1Factory : IEventFactory { public bool AcceptsInputString(string inputString) { return inputString.StartsWith("SportEvent1"); } public Event CreateEvent(string inputString) { return new SportEvent1(); } } public class MedicalEvent1Factory : IEventFactory { public bool AcceptsInputString(string inputString) { return inputString.StartsWith("MedicalEvent1"); } public Event CreateEvent(string inputString) { return new MedicalEvent1(); } } And here is the code that runs it: static void Main(string[] args) { EventFactory medicalEventFactory = new EventFactory(); medicalEventFactory.AddFactory(new MedicalEvent1Factory()); medicalEventFactory.AddFactory(new MedicalEvent2Factory()); EventFactory sportsEventFactory = new EventFactory(); sportsEventFactory.AddFactory(new SportEvent1Factory()); sportsEventFactory.AddFactory(new SportEvent2Factory()); } I have a couple of questions: Instead of having to add factories here in the main method of my application, should I try to redesign my EventFactory class so it is an abstract factory? It'd be better if I had a way of not having to manually add EventFactories every time I want to use them. So I could just instantiate MedicalFactory and SportsFactory. Should I make a Factory of factories? Maybe that'd be over-engineering? As you have probably noticed, I am using a inputString string as argument to feed the factories. I have an application that lets the user create his own events but also to load/save them from text files. Later, I might want to add other kinds of files, XML, sql connections, whatever. The only way I can think of that would allow me to make this work is having an internal format (I choose a string, as it's easy to understand). How would you make this? I assume this is a recurrent situation, probably most of you know of any other more intelligent approach to this. I am then only looping in the EventFactory for all the factories in its list to check if any of them accepts the input string. If one does, then it asks it to generate the Event. If you find there is something wrong or awkward with the method I'm using to make this happen, I'd be happy to hear about different implementations. Thanks! PS: Although I don't show it in here, all the different kind of events have different properties, so I have to generate them with different arguments (SportEvent1 might have SportName and Duration properties, that have to be put in the inputString as argument).

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  • How to center DIV in DIV?

    - by Lukas
    I'd like to ask you if anyone know how to horizontally center DIV in DIV with CSS ( if it's possible at all ). Outer DIV has 100%: <div id="outer" style="width:100%"> <div id="inner">Foo foo</div> </div> I've been searching for the solution for some time but I haven't found it anywhere yet...

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  • Choice of a deleted element at ListBox control

    - by Neir0
    Hi I have created a listbox control with following DataTemplate <DataTemplate x:Key="lb_Itemtemplate"> <DockPanel> <TextBlock Text="{Binding}" DockPanel.Dock="Left" /> <Button DockPanel.Dock="Right" Template="{StaticResource ButtonTemplate }" Width="20" Margin=" 0,1,1,10" >Delete </Button> <Button DockPanel.Dock="Right" Template="{StaticResource ButtonTemplate }" Width="20" Margin="0,1,1,10" >Highlight </Button> </DockPanel> </DataTemplate> <ListBox Name="listBox1" Grid.Column="0" Grid.Row="1" DataContext="{Binding ElementName=cb_fields, Path=SelectedItem}" ItemsSource="{Binding Path=PositiveXPathExpressions}" ItemTemplate="{StaticResource lb_Itemtemplate}" /> I want to delete element from "PositiveXPathExpressions" collection when user clicked on button "delete" but How i can decide which element i must to delete?

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  • EF and design pattern

    - by kathy
    Hello, I’m working on a high volume transactional enterprise application(asp.net, windows app, oracle app as client) which has been designed using n-tire application and SOA architecture .The application was developed in the .NET platform utilizing C#,VB.NET, Framework 3.5 (I’m planning to upgrade to the , Framework 4.0), EF( EF in the data layer level) and WCF(WCF services in the service layer level) Since this is the first project using EF, and having read about using EF in n-tier and SOA applications, and the features available in the EF Feature, I have the following points: Which design pattern should I use in EF( Simple Entities, Change Set, Self-Tracking Entities and DTOs) in the data layer level In addition Which design pattern should I use in the other tier and layer to get the best practices of EF Thanks

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  • How much effort do you have to put in to get gains from using SSE?

    - by John
    Case One Say you have a little class: class Point3D { private: float x,y,z; public: operator+=() ...etc }; Point3D &Point3D::operator+=(Point3D &other) { this->x += other.x; this->y += other.y; this->z += other.z; } A naive use of SSE would simply replace these function bodies with using a few intrinsics. But would we expect this to make much difference? MMX used to involve costly state cahnges IIRC, does SSE or are they just like other instructions? And even if there's no direct "use SSE" overhead, would moving the values into SSE registers and back out again really make it any faster? Case Two Instead, you're working with a less OO-based code base. Rather than an array/vector of Point3D objects, you simply have a big array of floats: float coordinateData[NUM_POINTS*3]; void add(int i,int j) //yes it's unsafe, no overlap check... example only { for (int x=0;x<3;++x) { coordinateData[i*3+x] += coordinateData[j*3+x]; } } What about use of SSE here? Any better? In conclusion Is trying to optimise single vector operations using SSE actually worthwhile, or is it really only valuable when doing bulk operations?

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  • WPF binding ComboBox to enum (with a twist)

    - by Carlo
    Well the problem is that I have this enum, BUT I don't want the combobox to show the values of the enum. This is the enum: public enum Mode { [Description("Display active only")] Active, [Description("Display selected only")] Selected, [Description("Display active and selected")] ActiveAndSelected } So in the ComboBox instead of displaying Active, Selected or ActiveAndSelected, I want to display the DescriptionProperty for each value of the enum. I do have an extension method called GetDescription() for the enum: public static string GetDescription(this Enum enumObj) { FieldInfo fieldInfo = enumObj.GetType().GetField(enumObj.ToString()); object[] attribArray = fieldInfo.GetCustomAttributes(false); if (attribArray.Length == 0) { return enumObj.ToString(); } else { DescriptionAttribute attrib = attribArray[0] as DescriptionAttribute; return attrib.Description; } } So is there a way I can bind the enum to the ComboBox AND show it's content with the GetDescription extension method? Thanks!

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  • How do I insert data from a Python dictionary to MySQL?

    - by NJTechie
    I manipulated some data from MySQL and the resulting dictionary "data" (print data) displays something like this : {'1': ['1', 'K', abc, 'xyz', None, None, datetime.date(2009, 6, 18)], '2': ['2', 'K', efg, 'xyz', None, None, None, None], '3': ['3', 'K', ijk, 'xyz', None, None, None, datetime.date(2010, 2, 5, 16, 31, 2)]} How do I create a table and insert these values in a MySQL table? In other words, how do I dump them to MySQL or CSV? Not sure how to deal with datetime.date and None values. Any help is appreciated.

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  • JavaFX Datagrid

    - by Chepech
    Hi All. Im in the verge of starting a new RIA development. We've been using Flex/Flash for the last 2 years but we were considering using a more OS approach so we though giving JavaFX a try since it seams the only solid option available. However after a couple of days of research we found out that there is not such thing as a datagrid for it, at least not in the core API. For those unfamiliar with Flex, a Datagrid is a component that allows you to display a collection of data in column-row layout (much like a HTML Table on steroids). The beauty of it is that you only need to worry about the data itself as the component does pretty much the rest (sorting, column dragging, etc). Im afraid to ask... but is there something slightly similar for JavaFX? We require nothing as fancy as Flex Datagrids/AdvancedDatagrids, we only require a easy, straight forward way to display grids of data that are able to have a little of interaction like clicking, sorting and that are able to display images, buttons, etc. without having to download a ton of different jars. If there isn´t something out there... This would be a shot in the back of the head to the idea of giving javaFx the chance to compete with flash on our project (which is sad). I really cant believe the SUN people didnt include something like this on the core API...

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  • Using off-the-shelf hardware for brand-name servers; Possible? Good idea?

    - by threecheeseopera
    Is it possible or advisable to use 'regular' not-sanctioned-by-the-server-manufacturer hardware in high end servers? Often these manufacturer-supplied parts have a very high price markup, and I wonder if it's always necessary (understanding that they probably apply more rigorous requirements to this hardware). For example, Dell sells 300GB 15,000rpm serial-attached scsi drives for a certain server family for almost $600 each, while newegg sells a drive with the same specs for almost half the price http://www.newegg.com/Product/Product.aspx?Item=N82E16822116059. Do we really need to pay these high markups, especially for disks that are likely RAID-ed and so guarded against catastrophic failure?

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  • WCF set bindings on service at runtime

    - by Dave
    My app has to be installed on my client's webservers. Some clients want to use SSL and some do not. My app has a WCF service and I currently have to go into the web.config for each install and switch the security mode from to depending on the client's SSL situation. I am able to set the client bindings at runtime. However, I would like to know if there is a way to set the service bindings at runtime(on the server side).

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  • using 'ar' tool in Alchemy

    - by paleozogt
    I've found that if you specify a path to Alchemy's 'ar' tool, it won't create the 'l.bc' file necessary to link the library. For example, here is the case when I don't specify a path (it works): asimmons-mac:test asimmons$ echo 'int main() { return 42; }' > testmain.cpp asimmons-mac:test asimmons$ echo 'int test1() { return -1; }' > test1.cpp asimmons-mac:test asimmons$ echo 'int test2() { return 1; }' > test2.cpp asimmons-mac:test asimmons$ g++ -c testmain.cpp asimmons-mac:test asimmons$ g++ -c test1.cpp asimmons-mac:test asimmons$ g++ -c test2.cpp asimmons-mac:test asimmons$ ar cr libtest.a test1.o test2.o asimmons-mac:test asimmons$ g++ testmain.cpp libtest.a llvm-ld, "-o=".(98237.achacks.o = "98237.achacks.exe"), -disable-opt -internalize-public-api-list=_start,malloc,free,__adddi3,__anddi3,__ashldi3,__ashrdi3,__cmpdi2,__divdi3,__fixdfdi,__fixsfdi,__fixunsdfdi,__fixunssfdi,__floatdidf,__floatdisf,__floatunsdidf,__iordi3,__lshldi3,__lshrdi3,__moddi3,__muldi3,__negdi2,__one_cmpldi2,__qdivrem,__adddi3,__anddi3,__ashldi3,__ashrdi3,__cmpdi2,__divdi3,__qdivrem,__fixdfdi,__fixsfdi,__fixunsdfdi,__fixunssfdi,__floatdidf,__floatdisf,__floatunsdidf,__iordi3,__lshldi3,__lshrdi3,__moddi3,__muldi3,__negdi2,__one_cmpldi2,__subdi3,__ucmpdi2,__udivdi3,__umoddi3,__xordi3,__subdi3,__ucmpdi2,__udivdi3,__umoddi3,__xordi3,__error /Users/asimmons/Development/alchemy-darwin-v0.5a/avm2-libc/lib/avm2-libc.l.bc /Users/asimmons/Development/alchemy-darwin-v0.5a/avm2-libc/lib/avm2-libstdc++.l.bc, test.l.bc 98237.achacks.o 98237.achacks.swf, 5593510 bytes written asimmons-mac:test asimmons$ ls -l total 10992 -rwxr-xr-x 1 asimmons staff 5593575 Apr 9 17:44 a.exe -rw------- 1 asimmons staff 1284 Apr 9 17:43 libtest.a -rw-r--r-- 1 asimmons staff 672 Apr 9 17:43 test.l.bc -rw-r--r-- 1 asimmons staff 27 Apr 9 17:43 test1.cpp -rwxr-xr-x 1 asimmons staff 536 Apr 9 17:43 test1.o -rw-r--r-- 1 asimmons staff 26 Apr 9 17:43 test2.cpp -rwxr-xr-x 1 asimmons staff 536 Apr 9 17:43 test2.o -rw-r--r-- 1 asimmons staff 26 Apr 9 17:43 testmain.cpp -rwxr-xr-x 1 asimmons staff 552 Apr 9 17:43 testmain.o asimmons-mac:test asimmons$ And here is an example where I do specify a path (it doesn't work). I try to tell 'ar' to put the library under 'lib' and then link to lib/libtest.a: asimmons-mac:test asimmons$ mkdir lib asimmons-mac:test asimmons$ echo 'int main() { return 42; }' > testmain.cpp asimmons-mac:test asimmons$ echo 'int test1() { return -1; }' > test1.cpp asimmons-mac:test asimmons$ echo 'int test2() { return 1; }' > test2.cpp asimmons-mac:test asimmons$ g++ -c testmain.cpp asimmons-mac:test asimmons$ g++ -c test1.cpp asimmons-mac:test asimmons$ g++ -c test2.cpp asimmons-mac:test asimmons$ ar cr lib/libtest.a test1.o test2.o asimmons-mac:test asimmons$ g++ testmain.cpp lib/libtest.a llvm-ld, "-o=".(98638.achacks.o = "98638.achacks.exe"), -disable-opt -internalize-public-api-list=_start,malloc,free,__adddi3,__anddi3,__ashldi3,__ashrdi3,__cmpdi2,__divdi3,__fixdfdi,__fixsfdi,__fixunsdfdi,__fixunssfdi,__floatdidf,__floatdisf,__floatunsdidf,__iordi3,__lshldi3,__lshrdi3,__moddi3,__muldi3,__negdi2,__one_cmpldi2,__qdivrem,__adddi3,__anddi3,__ashldi3,__ashrdi3,__cmpdi2,__divdi3,__qdivrem,__fixdfdi,__fixsfdi,__fixunsdfdi,__fixunssfdi,__floatdidf,__floatdisf,__floatunsdidf,__iordi3,__lshldi3,__lshrdi3,__moddi3,__muldi3,__negdi2,__one_cmpldi2,__subdi3,__ucmpdi2,__udivdi3,__umoddi3,__xordi3,__subdi3,__ucmpdi2,__udivdi3,__umoddi3,__xordi3,__error /Users/asimmons/Development/alchemy-darwin-v0.5a/avm2-libc/lib/avm2-libc.l.bc /Users/asimmons/Development/alchemy-darwin-v0.5a/avm2-libc/lib/avm2-libstdc++.l.bc, lib/test.l.bc 98638.achacks.o llvm-ld: error: Cannot find linker input 'lib/test.l.bc' asimmons-mac:test asimmons$ ls -l total 56 -rw-r--r-- 1 asimmons staff 552 Apr 9 17:46 98638.achacks.o drwxr-xr-x 3 asimmons staff 102 Apr 9 17:46 lib -rw-r--r-- 1 asimmons staff 27 Apr 9 17:45 test1.cpp -rwxr-xr-x 1 asimmons staff 536 Apr 9 17:46 test1.o -rw-r--r-- 1 asimmons staff 26 Apr 9 17:45 test2.cpp -rwxr-xr-x 1 asimmons staff 536 Apr 9 17:46 test2.o -rw-r--r-- 1 asimmons staff 26 Apr 9 17:45 testmain.cpp -rwxr-xr-x 1 asimmons staff 552 Apr 9 17:45 testmain.o asimmons-mac:test asimmons$ ls -l lib/ total 8 -rw------- 1 asimmons staff 1284 Apr 9 17:46 libtest.a asimmons-mac:test asimmons$ but the linker errors out because it can't find lib/test.l.bc. Notice how in the first example, 'test.l.bc' was generated alongside libtest.a. But in the second example test.l.bc was not generated. Where did it go? This is a contrived example, but in the project I'm trying to build with alchemy the make scripts generate libraries in full paths and then refer to them that way. It seems that alchemy's 'ar' tool is broken if you try to generate a library anywhere other than '.'. Has anyone else seen this? Is there a workaround? fyi, I've also posted this question on the Alchemy formus.

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