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SUB2IND4UP Linear index from subscripts of upper triangular matrix (only elements above diagonal) 1.0

  Date Added: July 06, 2013  |  Visits: 198

SUB2IND4UP Linear index from subscripts of upper triangular matrix (only elements above diagonal)

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IND = SUB2IND4UP(I, J) returns the linear index equivalent to the row and column subscripts I and JLet 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 subscripts I = [1:9];and J = [2:10];for matrix A, these are equivalent to indices IND = sub2ind4up(I, J);for vector b. 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 Ind Ind Upi Indices Obtained Rand
Users rating: 0/10

License: Shareware Size: 10 KB
SUB2IND4UP LINEAR INDEX FROM SUBSCRIPTS OF UPPER TRIANGULAR MATRIX (ONLY ELEMENTS ABOVE DIAGONAL) RELATED
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