Definition: A matrix that is only defined at (i,j) when i < j.
Generalization (I am a kind of ...)
upper triangular matrix.
See also strictly lower triangular matrix, ragged matrix.
j i - 7 7 6 - - 1 1 - - - 8 - - - -
It may be more compactly represented in an array by storing entry (i,j) in location n(i-1) + j - i(i-1)/2 - i = (2n-i)(i-1)/2 - i + j (1-based indexing).
If you have suggestions, corrections, or comments, please get in touch with Paul Black.
Entry modified 16 November 2016.
HTML page formatted Fri Feb 23 10:06:08 2018.
Cite this as:
Paul E. Black, "strictly upper triangular matrix", in Dictionary of Algorithms and Data Structures [online], Vreda Pieterse and Paul E. Black, eds. 16 November 2016. (accessed TODAY) Available from: https://www.nist.gov/dads/HTML/strictlyUpperTriangMat.html