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countRepetitions 1.0

  Date Added: April 06, 2013  |  Visits: 185


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How many sequences of any repeated element exist in a vector (and how long are they)? Example below.T = COUNTREPETITIONS(A) returns the total number of repetitions of anyelement in A. The n-th element in T is the number of n-time-repetitionsof any element in A.[T,D] = COUNTREPETITIONS(A) also returns a structure, containing a detailedlisting of all repetitions for each element in A.D.elements just reflects unique(A). Cell array k in D.listing contains onlythe repetitions of D.elements(k), using the same format as T.Input is restricted to be a vector of type logical, numeric or char.Matrices don't get rejected, but are interpreted as single vector, writtencolumn-wise from left to right (so possibly not what you want).Example: For A = [0,1,0,0,1,1,1,42,42,42], [T,D] = COUNTREPETITIONS(A) yields: T = [2 1 2 0 0 0 0 0 0 0], thus reporting 2x single elements, 1x a tuple, and 2x a triple of repeated elements. D = elements: [0 1 42] listing: {3x1 cell} is also easily interpreted: D.listing contains all element-wise repetitions in the same order as indicated by D.elements: D.listing{:} ans = 1 1 0 0 0 0 0 0 0 0 ( there's 1x a single 0, and 1x "[0,0]") ans = 1 0 1 0 0 0 0 0 0 0 ( there's 1x a single 1, and 1x "[1,1,1]") ans = 0 0 1 0 0 0 0 0 0 0 ( there's 1x "[42,42,42]") Thus if you are interested in the repetitions of a specific element, you may easily use logical indexing. For example: D.listing{D.elements == 42}, just yields [0 0 1 0 0 0 0 0 0 0].

Requirements: No special requirements
Platforms: Matlab
Keyword: Columnwise Logical Numeric Possibly Reporting Single Written Yields
Users rating: 0/10

License: Shareware Size: 10 KB
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