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• Linq To SQL: Retain list order when using .Contains

  - by rockinthesixstring

  I'm using Lucene.net to build a MyListOfIds As List(Of Integer) which I then pass on to my Linq service. I then search the database as follows Return _EventRepository.Read().Where(Function(e) MyListOfIds.Contains(e.ID)).ToList Now I know that Lucene is already ordering MyListOfIds based on the weight it gave each term. What sucks is that Linq is losing that order in it's SQL search. My Question: How can I retain that sort order when building my Lambda expression? I tried using LINQPad to see how the query is being built, but because I had to declare a variable LINQPad didn't show me the resultant SQL :-( Here's what I tried in LINQPad Dim i As New List(Of Integer) i.Add(1) i.Add(100) i.Add(15) i.Add(3) i.Add(123) Dim r = (From e In Events Where i.Contains(e.ID) Select e) note: my example is in VB.NET, but I don't mind if responses are in C#

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• How to include named capture groups in java regex?

  - by jrummell

  I'm new to regex in Java and I can't figure out how to include named capture groups in an expression. I'm writing a ScrewTurn Image Converter for Confluence's Universal Wiki Converter. This is what I have: String image = "\\[image(?<align>auto)?\\|\\|{UP\\(((?<namespace>\\w+)\\.)?(?<pagename>[\\w-]+)\\)}(?<filename>[\\w- ]+\\.[\\w]+)\\]"; Pattern imagePattern = Pattern.compile(image, Pattern.CASE_INSENSITIVE); It's throwing this exception in Pattern.comiple(): java.util.regex.PatternSyntaxException: Unknown look-behind group near index 19 \[image(?<align>auto)?\|\|{UP\(((?<namespace>\w+)\.)?(?<pagename>[\w-]+)\)}(?<filename>[\w- ]+\.[\w]+)\] ^ I've used named capture groups like this before in C# (?<namedgroup>asdf), but not in Java. What am I missing?

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• Safely dereferencing FirstOrDefault call in Linq c#

  - by samy

  For brevity's sake in my code, i'd like to be able to do the following: having a collection, find the first element matching a lambda expression; if it exists, return the value of a property or function. If it doesn't exist, return null. var stuff = {"I", "am", "many", "strings", "obviously"}; var UpperValueOfAString = stuff.FirstOrDefault(s => s.contains("bvi")).ToUpper(); // would return "OBVIOUSLY" var UpperValueOfAStringWannabe = stuff.FirstOrDefault(s => s.contains("unknown token")).ToUpper(); // would return null Is it possible with some linq-syntax-fu or do i have to check explicitly for the return value before proceeding?

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• strsplit in R with metacharacter

  - by user1429852

  I have received a large amount of data where the delimiter is a backslash (obviously a bad choice). I'm processing it in R for computation, and having a hard time finding how to split the string since the backslash is a metacharacter. For example, a string would look like this: "1128\0019\XA5\E2R\366\00=15" and I want to split it along the "\" character, but when I run the strsplit command: strsplit(tempStr, "\") Error in strsplit(tempStr, "\") : invalid regular expression '\', reason 'Trailing backslash' When I try to used the "fixed" option, it does not run because it is expecting something after the backslash: strsplit(tempStr, "\", fixed = TRUE) Unfortunately, I can't preprocess the data with another program because the data is generated daily. Please help and thanks!

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• How to dynamically use the PropertyType reflection attribute to create a respective typed Function<

  - by vsj

  I want to use type returned by PropertyType to create a typed function. I found this similiar http://stackoverflow.com/questions/914578/using-type-returned-by-type-gettype-in-c but this mentions how to create a list but does not mention how we can create a Func<. Please help me out. Pseudocode: PropertyInfo inf = typeof(SomeClass).GetProperty("PropertyName"); Type T=inf.PropertyType; Expression<Func<SomeClass,T>> le = GetPropertyOrFieldByName<SomeClass, T>("PropertyName");

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• How to convert an arbitrary object to String with EL? (calling toString())

  - by hstoerr

  Is there any way to call toString() on an object with the EL? (I need the String representation of an enum as index in a map in a JSP EL expression.) I hoped something like ${''+object} would work like in java, but EL isn't that nice, and there does not seem to be any function that does it. Clarification: I have a variable somemap that maps Strings to Strings, and I have a variable someenum that is an enumeration. I'd like to do something like ${somemap[someenum.toString()]}. (Of course .toString() does not work, but what does?)

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• Initialization of array on heap

  - by Radek Šimko

  How do i manually initiate values in array on heap? If the array is local variable (in stack), it can be done very elegant and easy way, like this: int myArray[3] = {1,2,3}; Unfortunately, following code int * myArray = new int[3]; myArray = {1,2,3}; outputs an error by compiling error: expected primary-expression before ‘{’ token error: expected `;' before ‘{’ token Do i have to use cycle, or not-so-much-elegant way like this? myArray[0] = 1; myArray[1] = 2; myArray[2] = 3;

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• Java Split not working as expected

  - by daaabears

  I am trying to use a simple split to break up the following string: 00-00000 My expression is: ^([0-9][0-9])(-)([0-9])([0-9])([0-9])([0-9])([0-9]) And my usage is: String s = "00-00000"; String pattern = "^([0-9][0-9])(-)([0-9])([0-9])([0-9])([0-9])([0-9])"; String[] parts = s.split(pattern); If I play around with the Pattern and Matcher classes I can see that my pattern does match and the matcher tells me my groupCount is 7 which is correct. But when I try and split them I have no luck.

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• Can't update date in aspx to a MS-ACCESS table

  - by Bjork

  Hello I'm having problem with updating datatypes I insert the date in the C# part like this string strSQL = "INSERT into Frettir (CreatedBy,CreatedOn,Title,Description,Starts,Ends,CatId,SectionId,ArticleExt,Myndatexti,MyndUrAlbumi,NrMyndar) values(?,?,?,?,?,?,?,?,?,?,?,?)"; cmd.Parameters.Add("@Starts",OleDbType.Date).Value = dstartdate; but I update in the aspx part like this UpdateCommand="UPDATE [Frettir] SET [Title]=@Title,[Description]=@Description,[CreatedBy]=@notandaID,[ArticleExt]=@ArticleExt, [Myndatexti]=@Myndatexti,[Starts]=@Starts WHERE [ArticleID]=@id2 " I get an error Data type mismatch in criteria expression It seems that there are some type differences between the type that is input in the c# part and the aspx-part Can anyone help me with this?

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• Basic Python While loop compound conditional evaluation

  - by dbjohn

  In Python IDLE Shell it seems I cannot use a compound conditional expression and a while loop. I tried it within brackets too. k=0 m=0 while k<10 & m<10: print k k +=1 m+=1 If I write while k<10: print k k+=1 This does work. Is there a way I could achieve the first block of code with the "and" operator. I have done it in Java. Do I just need to put together "if" statements to achieve the same functionality in Python?

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• Programming Quiz [closed]

  - by arin-s-rizk

  Hi one of my mates sent me this quiz see if you can guess the answers I will post mine later. In this quiz, some tasks related to the compilation process are listed. For each one of them, specify the part of the compiler that is responsible of performing it. Here are the possible answers: Lexical analyzer Parser Semantic analyzer None of the above Just fill the right choice (the number only) in the blank after each task: Checking that the parentheses in an expression are balanced _ _ _ _ _ Removing comments from the program _ _ _ _ _ Grouping input characters into "tokens" _ _ _ _ _ Reporting an error to the programmer about a missing (;) at the end of a C++ statement _ _ _ _ _ Checking if the type of the RHS (Right-Hand Side) of an assignment (=) is compatible with the LHS (Left-Hand Side) variable _ _ _ _ _ Converting the (AST) Abstract Syntax Tree into machine language _ _ _ _ _ Reporting an error about a strange character like '^' in a C++ program _ _ _ _ _ Optimizing the AST _ _ _ _ _

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• Excluding a specific substring from a regex

  - by Matt S

  I'm attempting to mangle a SQL query via regex. My goal is essentially grab what is between FROM and ORDER BY, if ORDER BY exists. So, for example for the query: SELECT * FROM TableA WHERE ColumnA=42 ORDER BY ColumnB it should capture TableA WHERE ColumnA=42, and it should also capture if the ORDER BY expression isn't there. The closest I've been able to come is SELECT (.*) FROM (.*)(?=(ORDER BY)) which fails without the ORDER BY. Hopefully I'm missing something obvious. I've been hammering in Expresso for the past hour trying to get this.

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• How to implement a C# interface in F#?

  - by Anton Andreev

  I would like to implement the following C# interface in F#: using System; using System.Collections.Generic; using System.Linq; using System.Text; using Mono.Addins; [TypeExtensionPoint] public interface ISparqlCommand { string Name { get; } object Run(Dictionary<string, string> NamespacesDictionary, org.openrdf.repository.Repository repository, params object[] argsRest); } This is what I have tried, but it gives me: "Incomplete structured construct at or before this point in expression" #light module Module1 open System open System.Collections.Generic; type MyClass() = interface ISparqlCommand with member this.Name = "Finding the path between two tops in the Graph" member this.Run(NamespacesDictionary, repository, argsRest) = new System.Object What am I doing wrong? Maybe indentation is wrong?

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• Python text file processing speed issues

  - by Anonymouslemming

  Hi all, I'm having a problem with processing a largeish file in Python. All I'm doing is f = gzip.open(pathToLog, 'r') for line in f: counter = counter + 1 if (counter % 1000000 == 0): print counter f.close This takes around 10m25s just to open the file, read the lines and increment this counter. In perl, dealing with the same file and doing quite a bit more (some regular expression stuff), the whole process takes around 1m17s. Perl Code: open(LOG, "/bin/zcat $logfile |") or die "Cannot read $logfile: $!\n"; while (<LOG>) { if (m/.*\[svc-\w+\].*login result: Successful\.$/) { $_ =~ s/some regex here/$1,$2,$3,$4/; push @an_array, $_ } } close LOG; Can anyone advise what I can do to make the Python solution run at a similar speed to the Perl solution? I've tried just uncompressing the file and dealing with it using open instead of gzip.open, but that made a very small difference to the overall time.

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• extract number of A tags using jquery

  - by user1017268

  I am working on an enterprise application where I can have several links present in table or none depending on the data. The links appear in the table and have following code behind them <td class="Row"><span id='s_3_2_14_0' ><a href='JavaScript:SWETargetGotoURL("/eservice_enu/start.swe?SWECmd=GotoView&SWEView=Active+PO+Serial+View&SWEPostnApplet=Purchase+Order+List+Applet&SWEPostnRowId=1-KPBLOZ","_self")'>2001103009</a></span></td> I need to find all the A tags present in the page inside SPAN tag having following text SWEView=Active+PO+Serial+View&SWEPostnApplet=Purchase+Order+List+Applet I tried the following expression but it returns 0 $('a[href*="SWEView=Active+PO+Serial+View&SWEPostnApplet=Purchase+Order+List+Applet"').length;

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• Using Where method in Linq 2 Entities with OR clause.

  - by Dani

  I want to use Where method in Linq 2 entities that will be equal to this userRepository.Users.Where(u=>u.RoleID == 1 || u=>u.RoldID == 2).Select(o => new SelectListItem { Text = o.Role.RoleName, Value = o.RoleID.ToString() }).ToList(); The problem of course is in Where(u=u.RoleID == 1 || u=u.RoldID == 2) The problem is that I don't know how to use WHERE method with OR inside the WHERE clause. any ideas (the code above will not compile of-course b/c of the lambda expression. userRepository.Users returns an list of Users entities. I guess that and can be done using concatenation of .Where().Where() but I need an OR.

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• boost timer usage question

  - by stefita

  I have a really simple question, yet I can't find an answer for it. I guess I am missing something in the usage of the boost timer.hpp. Here is my code, that unfortunately gives me an error message: include <boost/timer.hpp> int main() { boost::timer t; } And the error messages are as follows: /usr/include/boost/timer.hpp: In member function ‘double boost::timer::elapsed_max() const’: /usr/include/boost/timer.hpp:59: error: ‘numeric_limits’ is not a member of ‘std’ /usr/include/boost/timer.hpp:59: error: ‘::max’ has not been declared /usr/include/boost/timer.hpp:59: error: expected primary-expression before ‘double’ /usr/include/boost/timer.hpp:59: error: expected `)' before ‘double’ The used library is boost 1.36 (SUSE 11.1). Thanks in advance!

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• How can a class's memory-allocated address be determined from within the contructor?

  - by Jim Fell

  Is it possible to get the memory-allocated address of a newly instantiated class from within that class's constructor during execution of said constructor? I am developing a linked list wherein multiple classes have multiple pointers to like classes. Each time a new class instantiates, it needs to check its parent's list to make sure it is included. If I try to do something like this: MyClass() // contructor { extern MyClass * pParent; for ( int i = 0; i < max; i++ ) { pParent->rels[i] == &MyClass; // error } } I get this error: error C2275: 'namespace::MyClass' : illegal use of this type as an expression Any thoughts or suggestions would be appreciated. Thanks.

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• Test/expand my email regex

  - by Ross

  I'm really not confident with Regex, I know some basic syntax but not enough to keep me happy. I'm trying to build a regular expression to check if an email is valid. So far here's what I've got: [A-Za-z0-9._-]+@[A-Za-z0-9]+.[A-Za-z.]+ It needs to take account of periods in the username/domain and I think it works with multiple TLDs (e.g. co.uk). I'm working with the preg engine in PHP so it needs to work with that. Thanks if you can help!

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• What's the RegEx to make sure that delimiters are escaped?

  - by Kuyenda

  I'm looking for a regular expression that will check whether or not delimiters in a string are escaped with a backward slash. The delimiters I am concerned about are comma (\,), colon (\:), semicolon (\;) and of course the backward slash itself has to be escaped (\). For example, the string "test" should return a match because there are no delimiters in it, and no escaping is necessary. The string "te\;st" would return a match because the semicolon delimiter is escaped. "te;st" and "t\;s:t" would both fail because the both contain at least one delimiter that is not escaped. I know that I need a conditional and a positive look behind, and this is what I have so far, but it is not giving me the expected answer. ^(?<delimiter>[:;,\\])?(?(delimiter)\(?<=(?:\\\\)*\\)k<delimiter>|.)$ Any suggestions on how I can make this work? Thanks.

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• Show me some cool python list comprehensions

  - by christangrant

  One of the major strengths of python and a few other (functional) programming languages are the list comprehension. They allow programmers to write complex expressions in 1 line. They may be confusing at first but if one gets used to the syntax, it is much better than nested complicated for loops. With that said, please share with me some of the coolest uses of list comprehensions. (By cool, I just mean useful) It could be for some programming contest, or a production system. For example: To do the transpose of a matrix mat >>> mat = [ ... [1, 2, 3], ... [4, 5, 6], ... [7, 8, 9], ... ] >>> [[row[i] for row in mat] for i in [0, 1, 2]] [[1, 4, 7], [2, 5, 8], [3, 6, 9]] Please include a description of the expression and where it was used (if possible).

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• Exclude subexpression from regexec in c++

  - by wyatt

  Suppose I was trying to match the following expression using regex.h in C++, and trying to obtain the subexpressions contained: /^((1|2)|3) (1|2)$/ Suppose it were matched against the string "3 1", the subexpressions would be: "3 1" "3" "1" If, instead it were matched against the string "2 1", the subexpressions would be: "2 1" "2" "2" "1" Which means that, depending on how the first subexpression evaluates, the final one is in a different element in the pmatch array. I realise this particular example is trivial, as I could remove one of the sets of brackets, or grab the last element of the array, but it becomes problematic in more complicated expressions. Suppose all I want are the top-level subexpressions, the ones which aren't subexpressions of other subexpressions. Is there any way to only get them? Or, alternatively, to know how many subexpressions are matched within a subexpression, so that I can traverse the array irrespective of how it evaluates? Thanks

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• Let and construct versus let in sequence

  - by Stringer

  Consider this OCaml code: let coupe_inter i j cases = let lcases = Array.length cases in let low,_,_ = cases.(i) and _,high,_ = cases.(j) in low,high, Array.sub cases i (j-i+1), case_append (Array.sub cases 0 i) (Array.sub cases (j+1) (lcases-(j+1))) Why the expression let ... and ... in is used in place of a let ... in let ... in sequence (like F# force you to do)? This construct seems quite frequent in OCaml code. Thanks!

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• WPF: Custom control that binds its content to a label

  - by nialsh

  I want to write a custom control that's used like this: <HorizontalTick>Some string</HorizontalTick> It should render like this: -- Some string ------------------------------------------- Here's my code: <UserControl x:Class="WeatherDownloadDisplay.View.HorizontalTick" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignWidth="348" Name="controlRoot"> <DockPanel LastChildFill="True"> <UserControl VerticalAlignment="Center" BorderBrush="Black" BorderThickness="1" Width="10"/> <Label Content="???" /> <UserControl VerticalAlignment="Center" BorderBrush="Black" BorderThickness="1"/> </DockPanel> It works except for the label binding. Can someone help me fill in the question marks? I thought about using a ContentPresenter but it seems like an inline binding would be best. -Neal

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• Convert Json date string to JavaScript date object

  - by dagda1

  Hi, I have the following JSON object which has a date field in the following format: { "AlertDate": "\/Date(1277334000000+0100)\/", "Progress": 1, "ReviewPeriod": 12 } I want to write a regular expression or a function to convert it to a javascript object so that it is in the form: { "AlertDate": "AlertDate":new Date(1277334000000), "Progress": 1, "ReviewPeriod": 12 } The above date format fails validation in the JQuery parseJSON method. I would like to convert the 1277334000000+0100 into the correct number of milliseconds to create the correct date when eval is called after validation. Can anyone help me out with a good approach to solving this? Cheers Paul

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