I once read about a programming laguage which only first-order values were sequences. An integer value, for instance, was seen as a sequence of integers of one element. I totally forgot the name of that language, and the terms i use to search google are too generic, i can't find it. Anyone remembers it? :) ...
In python is there an easy way to tell if something is not a sequence? I tried to just do: if x is not sequence but python did not like that ...
Assume you have a vector like so: v <- c(1,1,1,2,2,2,2,1,1,3,3,3,3) How can it be best reduced to a data.frame like this? v.df <- data.frame(value=c(1,2,1,3),repetitions=c(3,4,2,4)) In a procedural language I might just iterate through a loop and build the data.frame as I go, but with a large dataset in R such an approach is ineffi...
Hi, i know nothing about programming or C or windowing... nothing too deep about computers... but i'm very interested in: given a pseudo-random binary sequence (e.g.: 00101010010101) of finite values, predict how will the sequence continue. Can someone please tell me the easiest way to do it? Or in case it's too difficult for someone who...
With that I mean similar to the Linq join, group, distinct, etc. only working on sequences of values, not collections. The difference between a sequence and a collection is that a sequence might be infinite in length, whereas a collection is finite. Let me give you an example: var c1 = new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; var c2 =...
Hi, Problem Statement You have an infinite sequence A[] with the following properties: * A[0], A[1], ..., A[N-1] are given; * A[i]=(A[i-1]+A[i-2]+...+A[i-N])%10 for all i>=N; Sequence B[] with length M is a substring of A[] if there is such index P that B[0]=A[P], B[1]=A[P+1], ..., B[M-1]=A[P+M-1]. Your task is to find the smal...
I have a multithreaded process which inserts several records into a single table. The inserts are performed in a stored procedure, with the sequence being generated INTO a variable, and that variable is later used inside of an INSERT. Given that I'm not doing mysequence.nextval inside the INSERT itself, it makes me think that it is pos...
Hello, I want to use OracleCommandBuilder to automatically generate commands for my DataAdapter. But how can I use the oracles sequences to insert values in those automatically generated commands? Yes, I know about such construction: "INSERT INTO myTable (id, my_name, my_date) ...
Hi, why does not this code work? type Test() = static member func (a: seq<'a seq>) = 5. let a = [[4.]] Test.func(a) It gives following error: The type 'float list list' is not compatible with the type 'seq<seq<'a>>' ...
How do you the following: given a string, generate all the possible ways to parse that string into substrings (time is important, space dont' care). For example, given the string ABCD, I need to generate: ABCD A BCD A BC D A B CD AB CD AB C D ABC D A B C D Probably a recursive solution, but I can't quite get it to work. ...
Hi, The ids in my postgresql database are auto-incremental (there are sequences defined in a database). When creating a hibernate mapping files I set the class generator to increment: <class name="model.Names" schema="public" table="names"> <id name="id" type="int"> <column name="id"/> <generator class="increment"/> ...
I need to insert a record into a table and set the value of a column (e.g. orderid) to a unique #. And return that number used. I thought the process would be to do use a sequence and an insert statement with nextval: insert into ordersTable(orderid) values(ordernums.nextval); But how to I get the number that was used? My thought i...
Caveats: Let me first clarify that this is not a question about whether to use surrogates primary keys or not. Also, this is NOT a related to identities (SQL Server) / Sequences (Oracle) and their pros / cons. I did get a fair bit of idea about that thanks to this, this and this Question: I come from a SQL Server background and have...
I have a list of numbers e.g. 21,4,7,9,12,22,17,8,2,20,23 I want to be able to pick out sequences of sequential numbers (minimum 3 items in length), so from the example above it would be 7,8,9 and 20,21,22,23. I have played around with a few ugly sprawling functions but I am wondering if there is a neat LINQ-ish way to do it. Any sug...
I'm just learning Oracle and I understand the concept of triggers and sequences. What I can't seem to find is how they are used together in an auto-increment fashion similar to a SqlServer Identity setting. In a really simple example, I have a table called Employees that has three fields (all required): EmployeeID (PK), FirstName, LastNa...
Hi, I am using Java and Hibernate as ORM tool. Is there any way i can implement sequence in Java using Hibernate? Currently I am using Oracle sequences to achieve this, but that is a very costly way as interaction with database increases. Please help. ...
I am trying to figure out how to manage multiple lazy sequences from a single function in F#. For example, in the code below, I am trying to get two sequences - one that returns all files in the directories, and one that returns a sequence of tuples of any directories that could not be accessed (for example due to permissions) with th...