Definition: A matrix that is only defined at (i,j) when i ≤ j.
Generalization (I am a kind of ...)
Specialization (... is a kind of me.)
strictly upper triangular matrix, .
See also lower triangular matrix, ragged matrix.
j i 1 7 7 6 - 9 1 1 - - 8 8 - - - 1
It may be more compactly represented in an array by storing entry (i,j) in location n(i-1) + j - i(i-1)/2 = (2n-i)(i-1)/2 + j 1-based indexing.
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Entry modified 16 November 2016.
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Cite this as:
Paul E. Black, "upper triangular matrix", in Dictionary of Algorithms and Data Structures [online], Paul E. Black, ed. 16 November 2016. (accessed TODAY) Available from: https://www.nist.gov/dads/HTML/upperTriangularMatrix.html