Definition: A matrix that is only defined at (i,j) when i > j.
Generalization (I am a kind of ...)
lower triangular matrix.
See also strictly upper triangular matrix, ragged matrix.
j i - - - - 7 - - - 1 0 - - 1 9 5 -
It may be more compactly represented in an array by storing entry (i,j) in location (i-1)(i-2)/2 + j (one-based indexing).
If you have suggestions, corrections, or comments, please get in touch with Paul E. Black.
Entry modified 17 December 2004.
HTML page formatted Fri Mar 25 16:20:35 2011.
Cite this as:
Paul E. Black, "strictly lower triangular matrix", in Dictionary of Algorithms and Data Structures [online], Paul E. Black, ed., U.S. National Institute of Standards and Technology. 17 December 2004. (accessed TODAY) Available from: http://www.nist.gov/dads/HTML/strictlyLowerTriangMat.html