MATRIX REPRESENTATION

A 'matrix representation' is a method used by a computer language to store matrices of more than one dimension in memory.
Fortran and C use different schemes. Fortran uses "Column Major", in which all the elements for a given column are stored contiguously in memory. C uses "Row Major", which stores all the elements for a given row contiguously in memory.
LAPACK defines various matrix representations in memory. There is also Sparse matrix representation and Morton-order matrix represention.
According to the documentation, in LAPACK the unitary matrix representation is optimized. See [1].

Contents

See also

External links

See also

★ Row- and column-major order

★ Sparse matrix

★ Skyline matrix

External links

★ http://developer.r-project.org/Sparse.html a description of sparse matrices in R.
R. LEHOUCQ, The computation of elementary unitary matrices, Computer Science Dept. Technical Report CS-94-233, University of Tennessee, Knoxville, 1994. (LAPACK Working Note 72).