> Subject: [scala-user] Making combinations > > > I think I have a relatively common programming problem. These are an adaptation of the Ninety-Nine Prolog Problems written by Werner Hett at the Berne University of Applied Sciences in Berne, Switzerland. In my > environment, a currency and a credit card tuple is called a Route. GitHub Gist: instantly share code, notes, and snippets. I () have altered them to be more amenable to programming in Scala.Feedback is appreciated, particularly on anything marked TODO.. > > Here is my scala representation of the problem described so far: > javascript npm-module permutations combinations calculation Updated Nov 21, 2020; P26 (**) Generate the combinations of K distinct objects chosen from the N elements of a list. An example of a combination is in the cards you are dealt in a poker-hand, out of the possible 52 cards you are drawn 5 (52 choose 5). The problems have different levels of difficulty. 組み合わせは combinations メソッドで求められます． scala> a.combinations :9: error: missing arguments for method combinations in trait SeqLike; follow this method with `_' if you want to treat it as a partially applied function a.combinations 引数無しで呼ぶとエラーになってしまいました． This has been unit-tested with ScalaTest, and has proper documentation. */ val xsize = l.size /** * Generates the combinations of this list with given length 'n'. It's Scala permuted! The difference between combinations and permutations is ordering. * Permutations 26/10/2015 PERMUTE CSECT USING PERMUTE,R15 set base register LA R9,TMP-A n=hbound(a) SR R10,R10 nn=0 Generate Permutations of String in Scala. In how many ways can a committee of 3 be chosen from a group of 12 people? I need to make > combinations of currencies and credit card types out of strings. With permutations we care about the order of the elements, whereas with combinations … Here's another implementation in Scala that generates permutations in a different way: def permutationsTwo[A](input: Set[A]): Set[List[A]] = { // we use an inner function called "loop" so that we can hide the fact that // we're converting the input set into a list. We all know that there are C(12,3) = 220 possibilities (C(N,K) denotes the well-known binomial coefficient). scala combinatorics permutations group-theory permutation-groups permutation-algorithms group-theory-algorithms Updated Mar 19, ... A calculation npm module that is to simplify the calculation of permutations and combinations. * - xpermutations -- generates all permutations * */ object CombinatorialOps {implicit class CombinatorialList [A](l: List [A]) {/** * A pre-calculated size of given list. A combination is the action of selecting a set amount of elements from a larger group, where order is not considered (dissimilar to a permutation). S-99: Ninety-Nine Scala Problems. The order * doesn't matter. Translation of: Scala. More Permutations in Scala. I rewrote my original code which used bitmasking and shifts because I thought it was too "magical", i.e., difficult to understand at first glance. ... and pass the intermediate result to a deciding routine for combinations selection and/or early generator termination. Permutations with repetitions is a draft programming task. I have since generalized it for combinations of variables with only 2 values, and added a dash of general Scala-isms. For pure mathematicians, this result may be great. Code, notes, and snippets Scala.Feedback is appreciated, particularly on marked. Scala.Feedback is appreciated, particularly on anything marked TODO, and has proper documentation a currency and a card! 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