java: how do I create an array of tuples
how can I create an array of tuples in jsp (java) like (a:1, b:2) (c:3, d:4) ... ... ...
tuples
Implementing a very simple 'Wine Rating System' in Haskell
Hello, I have just started learning Haskell and have got stumped on how to add a rating to a custom data type. The data type I'm using has a name, a year and a tuple (userName and their rating), it looks like: data Wine = Wine String Int [Rating] deriving (Eq,Ord,Show,Read) type Rating = (String, Int) I wanted to allow a user to rate...
Maximum Row in DBMS
Is there any limit to maximum row of table in DBMS (specially MySQL)? I want create table for saving logfile and it's row increase so fast I want know what shoud I do to prevent any problem. ...
scala coalesces multiple function call parameters into a Tuple -- can this be disabled?
This is a troublesome violation of type safety in my project, so I'm looking for a way to disable it. It seems that if a function takes an AnyRef (or a java.lang.Object), you can call the function with any combination of parameters, and Scala will coalesce the parameters into a Tuple object and invoke the function. In my case the functi...
Matching tuples in Prolog
Why does Prolog match (X, Xs) with a tuple containing more elements? An example: test2((X, Xs)) :- write(X), nl, test2(Xs). test2((X)) :- write(X), nl. test :- read(W), ...
searching a list of tuples in python
So I have a list of tuple like: [(1,"juca"),(22,"james"),(53,"xuxa"),(44,"delicia")] I want this list for a tuple whose number value is equal to something. So that if I do search(53) it will return 2 Is is an easy way to do that? ...
What is the benefit and a common real-world practical application of using Tuples in .NET 4.0?
I have read about the Tuples provided with the coming-out of the new .NET Framework features, and still am I wondering about how it could be useful in real-world enterprise applications. Can one give me a brief explanation along with a simple but real-world code sample? Thanks! =) ...
Django: Meaning of leading underscore in list of tuples used to define choice fields?
I've seen a few examples defining choice fields like so: COUNTRIES = ( ('fr', _('France')), ('de', _('Germany')), ... ) (source: http://code.djangoproject.com/ticket/5446 Also see: http://djangosnippets.org/snippets/494/) What is the meaning of the leading underscores? And why is the second value in the tuple even parent...
What are "named tuples" in Python?
Reading the changes in Python 3.1, I found something... unexpected: The sys.version_info tuple is now a named tuple: I never heard about named tuples before, and I thought elements could either be indexed by numbers (like in tuples and lists) or by keys (like in dicts). I never expected they could be indexed both ways. Thus, my qu...
Haskell Tuple Size Limit
Why I can't construct large tuples in Haskell? Why there's a tuple size limit? Prelude> (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1) <interactive>:1:0: No instance for (Show (t, t1, t2, ... t23)) arising...
Why is TRest in Tuple<T1... TRest> not constrained?
In a Tuple, if you have more than 7 items, you can provide an 8th item that is another tuple and define up to 7 items, and then another tuple as the 8th and on and on down the line. However, there is no constraint on the 8th item at compile time. For example, this is legal code for the compiler: var tuple = new Tuple<int, int, int, int...
C++ How to generate the set of cartesian product of n-dimensional tuples
I wish to generate some data that represents the co-ordinates of a cloud of points representing an n-cube of n dimensions. These points should be evenly distributed throughout the n-space and should be able to be generated with a user-defined spacing between them. This data will be stored in an array. ...
Is Using Tuples in my .NET 4.0 Code a Poor Design Decision?
With the addition of the Tuple class in .net 4, I have been trying to decide if using them in my design is a bad choice or not. The way I see it, a Tuple can be a shortcut to writing a result class (I am sure there are other uses too). So this: public class ResultType { public string StringValue { get; set; } public int IntV...
Test assertions for tuples with floats
I have a function that returns a tuple that, among others, contains a float value. Usually I use assertAlmostEquals to compare those, but this does not work with tuples. Also, the tuple contains other data-types as well. Currently I am asserting every element of the tuple individually, but that gets too much for a list of such tuples. Is...
Tuples vs. Anonymous Types vs. Expando object. (in regards to LINQ queries)
I am a beginner who finally started understanding anonymous types. (see old post http://stackoverflow.com/questions/3010147/what-is-the-return-type-for-a-anonymous-linq-query-select-what-is-the-best-way-t) So in LINQ queries you form the type of return value you want within the linq query right? It seems the way to do this is anonymou...
Is it possible to imitate python tuples in C?
I am just curious to know what are the strategies ? (If the strategies exists). ...
Alternative to List<Tuple<Grid, TabItem, int, string, int>>... in C#
Hi, I'm trying to find an alternative to List<Tuple<Grid, TabItem, int, string, int>>..., since I need to be able to modify the integers' values or string's value. I say "alternative" because I don't think it's possible to modify any values in a tuple. I don't want to delete it and create it again with different values. ...
What problem was the tuple designed to solve?
I'm looking at the new C# feature of tuples. I'm curious, what problem was the tuple designed to solve? What have you used tuples for in your apps? Update Thanks for the answers thus far, let me see if I have things straight in my mind. A good example of a tuple has been pointed out as coordinates. Does this look right? var coords =...
What's the purpose of the Tuple(T1)/Singleton in .net?
One of the Tuple Types in .net 4 is a Single-Element Tuple. I just wonder what the purpose of this struct is? The only use I saw is when using in the 8+ Tuple as it can be assigned to TRest, where it actually makes sense. Is that it? Or is there any other purpose? ...
Getting one value from a python tuple
Is there a way to get one value from a tuple in python using expressions? def Tup(): return (3,"hello") i = 5 + Tup(); ## I want to add just the three I know I can do this: (j,_) = Tup() i = 5 + j But that would add a few dozen lines to my function, doubling its length. ...