Triangular factor
Triangular factors are [Triangular Matrix|Triangular Matrices] the results of LU decomposition or QR decomposition.
In the QR decomposition, the resulting R matrix is Triangular factor. In the LU decomposition, the resulting L and U matrices are Triangular factors.
"" There are many cases when it is important to have information on the extremal singular values of a square matrix A. Sometimes, it is too expensive to calculate the singular values exactly and an approximation of these quantities suffices. "" They can be calculated from the Triangular Factor.
- from http://www-sccm.stanford.edu/seminar-w2003/Slot02.htm that mentions the usage of Triangular Factors