Triangular and Diagonal Indexing 1.0

Operating systemsOS : Windows / Mac OS
Program licensingScript Licensing : BSD - BSD License
CreatedCreated : Aug 17, 2009
Size downloadDownloads : 1
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For a symmetric matrix A, A(:) (full "vectorization") ...

For a symmetric matrix A, A(:) (full "vectorization") contains more information than is strictly necessary, since the matrix is completely determined by the symmetry together with the lower triangular portion, that is, the n(n+1)/2 entries on and below the main diagonal.
This package provides functions for conveniently indexing the triangular parts (both lower and upper) parst as well as the diagonals of the matrix.
It also provides the so called Duplication and Elimination matrices which is used to convert between full and half-vectorization of the matrix. The outputs are useful for programmers who wish to manipulate directly triangular parts without calling built-in functions such as TRIL, TRIU and DIAG.
Demands:
• MATLAB 7. 3 or higher

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