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IND2SUB4UP Subscripts from linear index for upper triangular matrix (only elements above diagonal) 1.0

  Date Added: March 29, 2013  |  Visits: 250

IND2SUB4UP Subscripts from linear index for upper triangular matrix (only elements above diagonal)

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[I, J] = IND2SUB4UP(IND) returns vectors I and J containing equivalent row and column subscripts corresponding to the index vector IND.Let ind be a vector of indexes for entries of some upper triangular matrix. The entries are selected vertically so that: ind = 1 is associated to entry (1, 2) ind = 2 is associated to entry (1, 3) ind = 3 is associated to entry (2, 3) ind = 4 is associated to entry (1, 4) ... ind = N * (N - 1) / 2 is associated to entry (N - 1, N)***********************************************************************EXAMPLEIf A = rand(10);and b = A(find(triu(A, 1)));then, given indices IND = [1:45];for vector b, these are equivalent to subscripts [I, J] = ind2sub4up(IND);for matrix A. In fact: all(A(sub2ind(size(A), I, J)) == b(IND))ans = 1This is obtained without even knowing about size(A)***********************************************************************See also SUB2IND, IND2SUB, FIND.

Requirements: No special requirements
Platforms: Matlab
Keyword: Afindtriua Allasub Indsizea Entry Ind Upind Indices Rand Sizea
Users rating: 0/10

License: Shareware Size: 10 KB
IND2SUB4UP SUBSCRIPTS FROM LINEAR INDEX FOR UPPER TRIANGULAR MATRIX (ONLY ELEMENTS ABOVE DIAGONAL) RELATED
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