CKoenig

• Brian Beckman: Hidden Markov Models, Viterbi Algorithm, LINQ, Rx and Higgs Boson

  Jan 01, 2012 at 10:21 PM

  finally ... cannot wait to see this ... downloading now - enjoying after work ... thank you guys

• TouchDevelop - Getting Started

  Aug 15, 2011 at 5:38 AM

  I would really like to play with this but I've got the (known) install problem (c101b00b) - is there any cure for this ill on the way?

• Rx Workshop: Schedulers

  Jul 11, 2011 at 9:09 PM

  Hi - you never have to "foreach" - you can allways use some LINQ-syntax to do the same (and tools like ReSharper even have some automatic code-conversation between the two ways) - it's just a matter of taste and the way the code might look if you use Select/Aggregate/whatever to make it LINQish.

• Rx Workshop: Schedulers

  Jul 05, 2011 at 9:32 PM

  Indeed this might be the indented way - thanks.

  But boths of theses seems to me like "breaking the pattern" - if we use a concrete scheduler in the definition of the Observable-Source then what about SubscribeOn (the one with the IScheduler overload)?

  What I had expected was something like Create with "Action<ISubscriber>" or something like

  public static IObservable<tData> ToObservable<tData>(this IEnumerable<Tuple<DateTimeOffset, tData>> source)
  {
  /* feed the data (snd) into a IObsevable and use the fst component for the scheduler, whatever it might be */
  }

• Rx Workshop: Schedulers

  Jul 04, 2011 at 4:41 AM

  Well - here is my try.

  I have to say I've got some problems with this. First it took me a horrible long time to realise that Subject can be used as an Observable-Source you can publish values to. And even worse is the way I have to use the Schedule/OnNext - mess.

  Don't know if there is any better way, but why was the way suggested by the video droped?

          IObservable<StockQuote> GetQuotes(IScheduler scheduler, IEnumerable<StockQuote> quotes)
          {
              // Create an observable source of stock quotes
              var sub = new Subject<StockQuote>();
  
              foreach (var quote in quotes)
              {
                  var quote1 = quote;
                  scheduler.Schedule(quote.Date, () => sub.OnNext(quote1));
              }
  
              return sub;
          }
  
          IObservable<object> Query(IObservable<StockQuote> quotes)
          {
              // Write a query to grab the Microsoft "MSFT" stock quotes and output the closing price
              // HINT: Make sure you include a property in the result which has a type of DateTime
              return quotes.Where(q => q.Symbol == "MSFT").Select(q => new {q.Date, q.Close, q.High, q.Low, q.Open});
          }

• Rx Workshop: Unified Programming Model

  Jul 03, 2011 at 10:11 PM

  a pitty that nobody posted anything on te challange (or am I missing something?) so here is my *take* on it:

              // Convert txt.TextChanged to IObservable<EventPattern<EventArgs>> and assign it to textChanged.
              var textChanged =
                  Observable
                      .FromEventPattern(addHandler: evHandler => txt.TextChanged += evHandler,
                                        removeHandler: evHandler => txt.TextChanged -= evHandler)
                      .Select(ev => ((TextBox) ev.Sender).Text)
                      .Throttle(TimeSpan.FromMilliseconds(300));
  
              // Convert BeginMatch/EndMatch to Func<string, IObservable<DictionaryWord[]>> and assign it to getSuggestions.
              var getSuggestions = Observable.FromAsyncPattern<string, DictionaryWord[]>(begin: BeginMatch, end: EndMatch);
  
              var results = from text in textChanged
                            where text.Length >= 3
                            from suggestions in getSuggestions(text)
                            select suggestions;
  

  As you might see I took the freedom to change some little pieces.

  First I want to get the text from textChanged (just like in the cast) and second I don't want to fire 7 webrequests in succesion to get the suggestions for "automobile" while typing, so I throttle the textChanged-Observable to 300ms.

• Silverlight Firestarter 2010 Keynote with Scott Guthrie

  Dec 03, 2010 at 12:48 AM

  14 minutes ago

  Silverlight/WPF.  Never made it.  Microsoft should just come to terms with this and push HTML5. End of story.

  Yeah HTML5 for desktop ... nice ... man go dig yourself some grave

• An F# Tutorial with Don Syme (#2 of 4)

  Sep 27, 2010 at 9:58 PM

  Really nice one - thanks a lot.

  Just one think bothers me: Dave positioning needs to be changed

• C9 Lectures: Dr. Ralf Lämmel - Advanced Functional Programming - Type Classes

  Aug 21, 2010 at 2:04 AM

  Hi,

  really love the series so far.

  I still hope for typeclasses in the CLR

• C9 Lectures: Dr. Ralf Lämmel - Advanced Functional Programming - The Expression Problem

  Aug 16, 2010 at 9:55 AM

  Nice.

   

  Would be even better if

  - it would use F#

  - F# would give us Type-Classes

   

  So PLEASE give us Type-Classes for the next release of F# - I guess it would have to be implemented into the CLR but after all we got generics, extension-methods etc. only for LINQ - so why not give us some nice functional sugar ?

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