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• Delphi: EInvalidOp in neural network class (TD-lambda)

  - by user89818

  I have the following draft for a neural network class. This neural network should learn with TD-lambda. It is started by calling the getRating() function. But unfortunately, there is an EInvalidOp (invalid floading point operation) error after about 1000 iterations in the following lines: neuronsHidden[j] :=…

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• Good Lambda Probe Alternative

  - by joel_gil

  hello everyone i was just wondering of a good Lambda Probe alternative for monitoring MySQL server with GLassfish The cath is that we dont want just a current monitor but sth that will keep a history since i am going to stress test some servers and i would like sth that outputs the data either in tables or…

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• LINQ Query vs Lambda Expression

  - by FosterZ

  What is the difference between the following two snippets (i.e LINQ Query vs Lambda Expression) LINQ Query public Product GetProduct(int productID) { AdventureWorksDBDataContext db = new AdventureWorksDBDataContext(); Product product = (from p in db.Products where…

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• _=> what does this mean in Lambda expressions?

  - by user216571

  What does an lambda expression like _= expr mean? What is the purpose of _ as input to lambda?

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• Does lamda in List.ForEach leads to memory leaks and performance problems ?

  - by Monomachus

  I have a problem which I could solve using something like this sortedElements.ForEach((XElement el) => PrintXElementName(el,i++)); And this means that I have in ForEach a lambda which permits using parameters like int i. I like that way of doing it, but i read somewhere that anonymous…

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• How to create and Expression tree to do the same as "StartsWith"

  - by Jonathan

  Hi to all. Currently, I have this method to compare two numbers Private Function ETForGreaterThan(ByVal query As IQueryable(Of T), ByVal propertyValue As Object, ByVal propertyInfo As PropertyInfo) As IQueryable(Of T) Dim e As ParameterExpression = Expression.Parameter(GetType(T),…

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• Lambda expressions in C#?

  - by user30457

  Hey I'm rather new to these could someone explain the significance or prehaps give a link to some useful information on lambda expressions? I encounter the following code in a test and I am wondering why someone would do this: foo.MyEvent += (o, e) = { fCount++;…

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• How to write a code Newton Raphson code in R involving integration and Bessel function

  - by Ahmed

  I have want to estimate the parameters of the function which involves Bessel function and integration. However, when i tried to run it, i got a message that "Error in f(x, ...) : could not find function "BesselI" ". I don't know to fix it and would appreciate any…

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• What do we call this operator => [closed]

  - by runrunraygun

  Possible Duplicate: How do I pronounce “=>” as used in lambda expressions in .Net => as in Enumerable.Range(0, 100).OrderBy(i => i) What is it called? I've taken to calling it "Lambda", was wondering if there is a proper name for it.

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• Create a ruby Proc from a string

  - by user252787

  I want to define the block as a string, then create the lambda. The following example does not work. Is something like this possible? code_string = "|x|x*2" l = lambda {eval(code_string)} l.call(3) => 6

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• What is lambda expression.

  - by stackuser1

  What is lambda expression, any tutorial or link is avilable?

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• Using System.DateTime in a C# Lambda expression gives an exception

  - by Samantha J

  I tried to implement a suggestion that came up in another question: Stackoverflow question Snippet here: public static class StatusExtensions { public static IHtmlString StatusBox<TModel>( this HtmlHelper<TModel> helper, …

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• Summation using Lambda C# 3.0

  - by Newbie

  I have a small thing. public int GetSum(List<int> x) { foreach (int i in x) sum += i; return sum; } where x is a List of integers defined as List<int> l = new List<int>(); l.Add(4); l.Add(2); l.Add(5); l.Add(8); l.Add(6); …

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• "Cannot use fixed local inside lambda expression"

  - by JulianR

  I have an XNA 3.0 project that compiled just fine in VS2008, but that gives compile errors in VS2010 (with XNA 4.0 CTP). The error: Cannot use fixed local 'depthPtr' inside an anonymous method, lambda expression, or query expression depthPtr is a fixed…

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• Change the for loop with lambda(C#3.0)

  - by Newbie

  Is it possible to do the same using Lambda for (int i = 0; i < objEntityCode.Count; i++) { options.Attributes[i] = new EntityCodeKey(); options.Attributes[i].EntityCode = objEntityCode[i].EntityCodes; options.Attributes[i].OrganizationCode =…

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• Creating a property setter delegate

  - by Jim C

  I have created methods for converting a property lambda to a delegate: public static Delegate MakeGetter<T>(Expression<Func<T>> propertyLambda) { var result = Expression.Lambda(propertyLambda.Body).Compile(); return result; } …

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• IComparer using Lambda Expression

  - by josephj1989

  class p { public string Name { get; set; } public int Age { get; set; } }; static List<p> ll = new List<p> { new p{Name="Jabc",Age=53},new p{Name="Mdef",Age=20}, new…

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• Can this be done using LINQ/Lambda, C#3.0

  - by Newbie

  Objective: Generate dates based on Week Numbers Input: StartDate, WeekNumber Output: List of dates from the Week number specified till the StartDate i.e. If startdate is 23rd April, 2010 and the week number is 1, then the program should return…

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• In C#, are Lamba Expressions objects?

  - by Brian Warshaw

  In C#, are lambda expressions objects? If so, what sort of object are they?

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• Will C++1x support __stdcall or extern "C" capture-nothing lambdas?

  - by Daniel Trebbien

  Yesterday I was thinking about whether it would be possible to use the convenience of C++1x lambda functions to write callbacks for Windows API functions. For example, what if I wanted to use a lambda as an EnumChildProc with EnumChildWindows?…

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• Strategy for desugaring Haskell

  - by luqui

  I'm developing a virtual machine for purely functional programs, and I would like to be able to test and use the the wide variety of Haskell modules already available. The VM takes as input essentially terms in the untyped lambda calculus. …

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• how do i execute a foreach lambda expression on ObservableCollection<T>

  - by Zain Shaikh

  how do i execute a foreach lambda expression on ObservableCollection there is not method of foreach with ObservableCollection although this method exists with List is there any extension method available?

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• Why it is not possible to evaluate lambda's in the immediate window

  - by Max

  Is there any particular reason? Is it not possible at all or is it just not implemented yet? Maybe there are any third-party addins that allow lambda evaluations?

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• How to show symbols like "Lambda" or "Mu" on lables in desktop application in c#.net

  - by Rajesh Rolen- DotNet Developer

  Please tell me how can i show symbols like "lambda" or Mu using c#.net in desktop application. what i think is we may do it using ASCII values and convert.toChar();.. if i am right that please give me link of page where i can get ASCII…

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• how do you add a condition to a lambda expression

  - by ooo

  if i have this code today to find out a sum total using LINQ: return (MyArray.Sum(r => r.Trips); and i want to only include itms where r.CanDrive == true. can you add a condition into a single linke lambda expression? how would…

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