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• checking last char of string in c

  - by radar75

  If I have two types of strings as: const char *str1 = "This is a string with \"quotes escaped at the end\""; const char *str2 = "This is a \"string\" without quotes at the end"; testFn(str1); testFn(str2); int testFn(char *str) { // test & return 1 if ends on no quote // test & return 0 if ends on quote return; } I would like to test if the string ends with a quote " or not What would be a good way of testing this? Thanks

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• How to create a backpropagation neural network in neurondonet?

  - by Suraj Prakash

  I am doing stock market prediction using ANNs in c#.net. I am using NeuronDotNet for the neural part. I have to give eight inputs to the network, with a hidden layer consisting 8 nodes and a single node output layer. Can anybody please give me some coding ideas for this???? This project was not a AI course assignment, but my major project. I have studied about the stocks and found various factors that affected the future value of stock of a company. Now I have to use these factors as input to the neural network. I am not getting into how to implement these factors in the neural network. I have just decided to use those eight factors as eight nodes in the input layer but things are going complex. My concern is to use these factors as input and train the neural network for output as next day's stock value. What major things should I have to care about??

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• Determining whether values can potentially match a regular expression, given more input

  - by Andreas Grech

  I am currently writing an application in JavaScript where I'm matching input to regular expressions, but I also need to find a way how to match strings to parts of the regular expressions. For example: var invalid = "x", potentially = "g", valid = "ggg", gReg = /^ggg$/; gReg.test(invalid); //returns false (correct) gReg.test(valid); //returns true (correct) Now I need to find a way to somehow determine that the value of the potentially variable doesn't exactly match the /^ggg$/ expression, BUT with more input, it potentially can! So for example in this case, the potentially variable is g, but if two more g's are appended to it, it will match the regular expression /^ggg$/ But in the case of invalid, it can never match the /^ggg$/ expression, no matter how many characters you append to it. So how can I determine if a string has or doesn't have potential to match a particular regular expression?

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• c# and linq: want {1,1,2,3} == {1,2,3,1} returns true but {1,1,2,3} == {1,2,3} returns false

  - by dFlat

  I have two sets, both IEnumerables, and I want to compare them. string[] names1 = { "tom", "dick", "harry" }; string[] names2 = { "tom", "dick", "harry", "harry"}; string[] names3 = { "tom", "dick", "harry", "sally" }; string[] names4 = { "dick", "harry", "tom" }; Want names1 == names4 to return true (and self == self returns true obviously) But all other combos return false. What is the most efficient way? These can be large sets of complex objects. I looked at doing: var a = name1.orderby<MyCustomType, string>(v => v.Name); var b = name4.orderby<MyCustomType, string>(v => v.Name); return a == b;

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• how to retrieve part of a string in java?

  - by mithun1538

  Hello everyone, I am designing a chat applet. In this, a user will append his name to the beginning of the message that he sends to the other user. In the window of other user, I want to retrieve the appended user name from that string. How do I do that? The message sent by the user is as follows : final_msg = user_name + ": " + user_message Hence I want to know how to retrieve the user_name string only. Is there a function that can retrieve a substring upto the first ":"? I dont want to use final_msg.split(":"), because there is a possiblity that the user_message contains ":", which will then give me an array of strings.

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• Reading ASCII numbers using "D" instead of "E" for scientific notation using C

  - by Arrieta

  Hello, I have a list of numbers which looks like this: 1.234D+1 or 1.234D-02. I want to read the file using C. The function atof will merely ignore the D and translate only the mantissa. The function fscanf will not accept the format '%10.6e' because it expects an E instead of a D in the exponent. When I ran into this problem in Python, I have up and merely used a string substitution before converting from string to float. But in C, I am sure there must be another way. So, how would you read a file with numbers using D instead of E for scientific notation? Notice that I do not mean how to read the strings themselves, but rather how to convert them to floats. Thanks.

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• Java Compiler: Optimization of "cascaded" ifs and best practices?

  - by jens

  Hello, does the Java Compiler optimize a statement like this if (a == true) { if (b == true) { if (c == true) { if(d == true) { //code to process stands here } } } } to if (a == true && b==true && c==true && d == true) So thats my first question: Do both take exactly the same "CPU Cycles" or is the first variant "slowlier". My Second questin is, is the first variant with the cascaded if considered bad programming style as it is so verbose? (I like the first variant as I can better logically group my expressions and better comment them (my if statements are more complex than in the example), but maybe thats bad proramming style?) and even slowlier, thats why I am asking... Thanks Jens

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• Sorting and indexing into a list in a Django template?

  - by slypete

  How can you perform complex sorting on an object before passing it to the template? For example, here is my view: @login_required def overview(request): physicians = PhysicianGroup.objects.get(pk=physician_group).physicians for physician in physicians.all(): physician.service_patients.order_by('bed__room__unit', 'bed__room__order', 'bed__order') return render_to_response('hospitalists/overview.html', RequestContext(request, {'physicians': physicians,})) The physicians object is not ordered correctly in the template. Why not? Additionally, how do you index into a list inside the template? For example, (this doesn't work): {% for note_type in note_types %} <div><h3>{{ note_type }}</h3> {% for notes in note_sets.index(parent.forloop.counter0) %} #only want to display the notes of this note_type! {% for note in notes %} <p>{{ note }}</p> {% endfor %} {% endfor %} </div> {% endfor %}

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• MVVM - RaisePropertyChanged turning code into a mess

  - by vidalsasoon

  New to MVVM so please excuse my ignorance. I THINK i'm using it right but I find my ViewModel has too many of these: RaisePropertyChanged("SomeProperty") Every time I set a property I have to raise that damned property changed. I miss the days where I could just go: public int SomeInteger { get; private set;} These days I have to stick the "RaisePropertyChanged" in everywhere or my UI does not reflect the changes :( Am I doing it wrong or are other people getting annoyed with the excessive number of magic strings and old school property setters? Should I be using dependency properties instead? (I doubt that would help the code bloat anyway) Despite these problems I still think MVVM is the way to go so I guess that's something.

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• How to make Excel strip ALL quotes from CSV text fields

  - by Klay

  When importing a CSV file into Excel, it only strips the double-quotes from the FIRST field on the line, but leaves them on all other fields. How can I force Excel to strip the quotes from ALL strings? For instance, I have a CSV file: "text1", "text2", "numeric1", "numeric 2" "abc", "def", 123, 456 "abc", "def", 123, 456 "abc", "def", 123, 456 "abc", "def", 123, 456 I import it into Excel using Data Import External Data Import Data. I specify that the fields are delimited by commas, and that the text delimiter is the double-quote character. Both the data preview and the actual Excel spreadsheet columns only strip the double-quotes from the first text field. All other text fields still have quotes around them. What's really strange is that Access is able to import this data correctly (i.e. strips quotes from every text field. Note that this is NOT a matter of internal commas or quotes or escape characters. This happens in Excel 2003 and Excel 2007.

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• Graph and permutation problem

  - by user319771

  I have a graph (with nodes and edges) containing symmetry and a group of permutations to label the nodes so no edges are changed (automorphisms). Now I would like to determine for which nodes a permutation exchanges two equivalent (i.e. nodes with the same color or symmetry class) neighboring nodes. When the nodes with equivalent neighbors stay the same, simply checking if the neighbors are exchanged in the permutation is enough. However, when the nodes with equivalent neighbors are also permuted (i.e. there are multiple nodes with the same color/symmetry class with the same equivalent neighbors), the problem becomes more complex. Is there any known algorithm for such a problem? Some remarks: The graph has no coordinates, it's a topology only

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• MVC pattern and State Machine

  - by topright

  I think of a game as a state machine. Game States separate I/O processing, game logic and rendering into different classes: while (game_loop) { game->state->io_events(this); game->state->logic(this); game->state->rendering(); } You can easily change a game state in this approach. MVC separation works in more complex way: while (game_loop) { game->cotroller->io_events(this); game->model->logic(this); game->view->rendering(); } So changing Game States becomes error prone task (switch 3 MVC objects, not 1). What are practical ways of combining these 2 concepts?

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• iPhone development: Best method to allow user to chose search scope

  - by Mark Pemburn

  Hi, I'm developing my first iPhone app and want to allow the user to select the scope of their search in a more complex way than the 'scope buttons' permit. The app is related to wines and I want to the user to be able to select the 'color' (Red, White, Blush, etc.) first, and then select the type/varietal within that category. Right now, I'm using the UISearchBar's scope buttons for the colors and tapping the button opens a view with the selection of colors. This is okay except that once the 'Red' button has been selected, I can't select it a second time to change my choice of type (e.g., change from 'Merlot' to 'Syrrah', etc.) If there's a better way to do this, I'm willing to scrap my method and start from scratch. Thanks!

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• JavaScript replace with callback - performance question

  - by Tomalak

  In JavaScript, you can define a callback handler in regex string replace operations: str.replace(/str[123]|etc/, replaceCallback); Imagine you have a lookup object of strings and replacements. var lookup = {"str1": "repl1", "str2": "repl2", "str3": "repl3", "etc": "etc" }; and this callback function: var replaceCallback = function(match) { if (lookup[match]) return lookup[match]; else return match; } How would you assess the performance of the above callback? Are there solid ways to improve it? Would if (match in lookup) //.... or even return lookup[match] | match; lead to opportunities for the JS compiler to optimize, or is it all the same thing?

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• How to Split and strip into multiple variables?

  - by Khou

  How to Split and strip X string values into separate variables? X has string value of itemA=myvalue&itemB=anothervalue&itemC=andanother I have 3 strings (var1,var2,var3) to hold the values of the stripped values. Find in string X "itemA=" copy everything after "=" character until "&" character OR if no "&" character is found copy until end of string (store this value into var1) Find in string X "itemB=" copy everything after "=" character until "&" character OR if no "&" character is found copy until end of string (store this value into var2) Find in string X "itemB=" copy everything after "=" character until "&" character OR if no "&" character is found copy until end of string (store this value into var3)

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• Difference between Document-oriented-DB and Bigtable clones

  - by chen

  We are looking for a suitable storage engine for our weblog history data. We looked at Bigtable's paper and understand it is suitable to us well. However, I also understand that Document-oriented-DB such as MongoDB seems to provide a little more powerful schema power -- i.e, it can model our data as well. I wonder how nowadays ppl choose a scalable NoSQL DB --- I read enough articles like "we looked at A, B and C, and we decided to use C". But I'd like to see some benchmark number. What I am saying is that if MongoDB and the like can provide same level of performance as Bigtable clones, why don't web companies choose it (preparing to deal with various potentially more complex data problem)? Thanks, By the way, I read an article (which convinced me at the moment) saying Cassandra does not fit the M/R operation, any comments?

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• pyODBC and Unicode Problem

  - by Aviv Giladi

  Hey guys, I'm working with pyODBC communicate with a MS SQL 2005 Express server. The table to which i'm trying to save the data consists of nvarchar columns. query = u"INSERT INTO tblPersons (name, birthday, gender) VALUES('" query = query + name + u"', '" query = query + birthday + u"', '" query = query + gender + u"')" cur.execute(query ) The variables name, birthrday and gende are read from an Excel file and they are Unicode strings. When I execute the query and either look at the table with SQL Server Management Studio or execute a query that fetches the data that was just inserted, all the data that was written in a non-English languages turn into question marks. The data that was written in English is preserved and appears in the table in the correct way. I tried adding CHARSET=UTF16 to my connection string, but had no luck with that. I can use UTF-8 which works fine but as a working convention, I need all the data saved in my DB to be UTF16. Thanks!

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• Howto format a date as localized Short MonthDay string

  - by Wouter

  I would like to format a DateTime to a string containing the month name abbreviated and the date for use in axislabels in a graph. The default DateTime format strings do not contain abbreviated month. I guess there is no standard but I could take a substring of the first 3 characters of the month name and replace this into the MonthDay format. The reason I would use MonthDay is that the ordering of month and date is locale dependent. Does anyone have a better idea? http://msdn.microsoft.com/en-us/library/az4se3k1.aspx#MonthDay

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• CSV string handling

  - by Christian Hagelid

  Typical way of creating a CSV string (pseudocode): create a CSV container object (like a StringBuilder in C#) Loop through the strings you want to add appending a comma after each one After the loop, remove that last superfluous comma. Code sample: public string ReturnAsCSV(ContactList contactList) { StringBuilder sb = new StringBuilder(); foreach (Contact c in contactList) { sb.Append(c.Name + ","); } sb.Remove(sb.Length - 1, 1); //sb.Replace(",", "", sb.Length - 1, 1) return sb.ToString(); } I feel that there should be an easier / cleaner / more efficient way of removing that last comma. Any ideas? Update I like the idea of adding the comma by checking if the container is empty, but doesn't that mean more processing as it needs to check the length of the string on each occurrence?

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• BindingList projection wrapper

  - by Groo

  Is there a simple way to create a BindingList wrapper (with projection), which would update as the original list updates? For example, let's say I have a mutable list of numbers, and I want to represent them as hex strings in a ComboBox. Using this wrapper I could do something like this: BindingList<int> numbers = data.GetNumbers(); comboBox.DataSource = Project(numbers, i => string.Format("{0:x}", i)); I could wrap the list into a new BindingList, handle all source events, update the list and fire these events again, but I feel that there is a simpler way already.

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• Visual Studio add-in to quickly test a code snippet

  - by Matti Virkkunen

  One thing I really love about languages such as Python is that if you have a piece of code you'd like to try out, you can just open the interactive shell and do it in seconds. Is there a Visual Studio add-in that does the same for C#? Basically what I'm looking for is something that opens up a window or tab with a text editor (preferably with code completion, because VS does it so nicely) and a button that runs the code and displays the output. Extra points for convenience features such as displaying complex output in a user-friendly way (think Firebug's console.log), automatically referencing all the assemblies the current project references, etc. I tried googling for a while, but either I fail at coming up with good keywords, or no-one has made an add-in like this. If there really is none, I'm considering making one myself.

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• TCHAR end of line character

  - by Xaver

  int DownloadFtpDirectory(TCHAR* DirPath) { WIN32_FIND_DATA FileData; UINT a; TCHAR* APP_NAME = TEXT("ftpcli"); TCHAR* f; int j = 5; do { j++; f = _tcsninc(DirPath, j); }while (_tcsncmp(f, TEXT("/"), 1)); TCHAR* PATH_FTP = wcsncpy(new TCHAR[j], DirPath, j); After the last line gets a string in which there is no line ending character, how to fix this? P.S. how to do so would be out of line "ftp://ftp.microsoft.com/bussys/", get a string ftp.microsoft.com if both strings are TCHAR ?

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• Compare two String with MySQL

  - by Scorpi0

  Hi, I wan't to compare two strings in a SQL request so I can retrieve the best match, the aim is to propose to an operator the best zip code possible. For example, in France, we have Integer Zip code, so I made an easy request : SELECT * FROM myTable ORDER BY abs(zip_code - 75000) This request returns first the data closest of Paris. Unfortunatelly, United Kingdom have zip code like AB421RS, so my request can't do it. I see in SQL Server a function 'Difference' : http://www.java2s.com/Code/SQLServer/String-Functions/DIFFERENCEworkoutwhenonestringsoundssimilartoanotherstring.htm But I use MySQL.. Is there anyone who have a good idea to do the trick in one simple request ? PS : the Levenshtein Distance will not do it, as I really wan't to compare string like if they were number. ABCDEF have to be closer to AWXYZ than to ZBCDEF.

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• Retrieving part of a string using jQuery / JavaScript

  - by ILMV

  I know how I would achieve this using PHP, but with jQuery / JavaScript I'm not sure how to, here's the string I'm dealing with (It's the name attribute from a input element): Field[0][some_random_text] I want to retrieve the value some_random_text and slap it in a variable, I guess I would usually use regex to accomplish this task but not sure how this is done in JavaScript. Here are some characteristics of this name attribute. It will always be in this format string[string][string] Each of the strings can be any length How would I get the some_random_text string? I'd like to stick to the standard set of functions if possible.

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• How can I specify the character encoding to be used by OLEDB when querying a DBF?

  - by Manga Lee

  Is it possible to specify which character encoding should be used by OLEDB when querying a DBF file? A possible work-around would be to encode the query string before the OLEDB call to the DBF file's character encoding and then encode all the results when they are returned. This will work but it would be nice if OLEDB or possibly ADO.NET could do this for me. UPDATE The suggestion by Viktor Jevdokimov does not seem to work automatically. But it made me investigate manual conversion of the strings. It is possible to use the TextInfo property of CultureInfo to find out the OemCodePage and the WindowsCodePage and use those to get the corresponding Encoding instances to perform manual conversion. But I can not get ADO.NET use these encondings to perform the conversion for me.

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