Position in a vector of linear independent values
Returns the position of the [i,j]th element of a symmetric
n x n matrix that this element has in a vector
of the linear independent values of the matrix.
veclipos( i, j, n )
i |
row of the element in the matrix. |
j |
column of the element in the matrix. |
n |
dimension of the matrix. |
A symmetric n x n matrix has n*(n+1)/2
independent values.
The function is: n*(n-1)/2-((n-min(i,j))*(n-min(i,j)+1)/2)+max(i,j)
Arne Henningsen
veclipos( 1, 2, 3 ) # returns: 2
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