Ask Question Asked 5 years, 5 months ago. All possible combinations of 2 vectors.. Toggle Main Navigation. Active 5 years, 5 months ago. You should be able to manipulate the results of e.g., nchoosek(1:8, 2) to give you what you need. Number of combinations w/ repetition is equal to (n + r - 1)! A permutation of a set of objects is an ordering of those objects. I want to find all the possible combinations from a set of pairs. But then the last row breaks this. Combinations with repetitions You are encouraged to solve this task according to the task description, using any language you may know. Say I have this line of code: c=nchoosek(1:6,2) , it gives: The combntns function provides the combinatorial subsets of a set of numbers. This example will help explaining the problem better. Description. / (r! where n = 7 for my purposes and r is a changeable number of spots as I called it. Without repetition is appropriate when supply is limited; with repetition when supply is unlimited. all combinations without repetition. So what is the rule? Say I have this line of code: c=nchoosek(1:6,2) , it gives: That's much more efficient than generating all combinations and choosing those with the correct sum. This example will help explaining the problem better. I want to find all the possible combinations from a set of pairs. So you're looking at permuting 8 things: combinations of the 6 objects and the 2 dividers. Skip to content. Nice algorithm without recursion borrowed from C. Recursion is elegant but iteration is efficient. This number of combinations will be the number of rows and the number of spots is the number of columns in the output. combos = combntns(set,subset) returns a matrix whose rows are the various combinations that can be taken of the elements of the vector set of length subset.Many combinatorial applications can make use of a vector 1:n for the input set to return generalized, indexed combination subsets.. MATLAB: All combinations from a set of rows without repetition of elements. Viewed 2k times 1. This algorithm (program in Matlab) calculates the number of permutations and combinations of … Learn more about combinations . In distinguishing between combinations allowing repetition and those not, I think it's a question of supply of the objects being selected that's important to consider. ... take at least one element from each vector, with repetition allowed only for the shorter vector. – Mark Dickinson Feb 1 '14 at 16:54 With combinations, one does not consider the order in which objects were placed. Generating all combinations without repetition using MATLAB. When some of those objects are identical, the situation is transformed into a problem about permutations with repetition. For maximum compatibility, this program uses only the basic instruction set (S/360) and two ASSIST macros (XDECO, XPRNT) to keep the code as short as possible. * (n-1)!) Combinations with repetitions you are encouraged to solve this task according to the task Description, using language. Is appropriate when supply is limited ; with repetition that 's much more efficient than all. 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