TEST_MATRIX_EXPONENTIAL
Matrix Exponential Tests
TEST_MATRIX_EXPONENTIAL
is a C++ library which
contains some simple tests for software that computes the
matrix exponential function.
Formally, for a square matrix A and scalar t, the matrix exponential
exp(A*t) can be defined as the sum:
exp(A*t) = sum ( 0 <= i < oo ) A^i t^i / i!
The simplest form of the matrix exponential problem asks for the
value when t = 1, that is
exp(A) = sum ( 0 <= i < oo ) A^i / i!
Even for this simple case, and for a matrix of small order, it can be quite
difficult to compute the matrix exponential accurately.
TEST_MATRIX_EXPONENTIAL needs the C8LIB and R8LIB libraries.
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
TEST_MATRIX_EXPONENTIAL is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version and
a Python version.
Related Data and Programs:
EXPOKIT,
a FORTRAN77 library which
solves various forms of the matrix exponential problem,
by Roger Sidje.
MATRIX_EXPONENTIAL,
a C++ library which
demonstrates some simple approaches to the problem of computing the
exponential of a matrix.
R8LIB,
a C++ library which
contains many utility routines using double precision real (R8) arithmetic.
TEST_MAT,
a C++ library which
defines test matrices.
Reference:
-
Alan Laub,
Review of "Linear System Theory" by Joao Hespanha,
SIAM Review,
Volume 52, Number 4, December 2010, page 779-781.
-
Cleve Moler, Charles VanLoan,
Nineteen Dubious Ways to Compute the Exponential of a Matrix,
SIAM Review,
Volume 20, Number 4, October 1978, pages 801-836.
-
Cleve Moler, Charles VanLoan,
Nineteen Dubious Ways to Compute the Exponential of a Matrix,
Twenty-Five Years Later,
SIAM Review,
Volume 45, Number 1, March 2003, pages 3-49.
-
Cleve Moler,
Cleve's Corner: A Balancing Act for the Matrix Exponential,
July 23rd, 2012.
-
Roger Sidje,
EXPOKIT: Software Package for Computing Matrix Exponentials,
ACM Transactions on Mathematical Software,
Volume 24, Number 1, 1998, pages 130-156.
-
Robert Ward,
Numerical computation of the matrix exponential with accuracy estimate,
SIAM Journal on Numerical Analysis,
Volume 14, Number 4, September 1977, pages 600-610.
Source Code:
Examples and Tests:
List of Routines:
-
C8MAT_EXP_A returns the matrix for a given complex test.
-
C8MAT_EXP_EXPA returns the "exact" exponential matrix for a given complex test.
-
C8MAT_EXP_N returns the matrix order for a given complex test.
-
C8MAT_EXP_STORY prints explanatory text for each complex problem.
-
C8MAT_EXP_TEST_NUM returns the number of complex tests.
-
R8MAT_EXP_A returns the matrix for a given real test.
-
R8MAT_EXP_EXPA returns the "exact" exponential matrix for a given real test.
-
R8MAT_EXP_N returns the matrix order for a given real test.
-
R8MAT_EXP_STORY prints explanatory text for each real problem.
-
R8MAT_EXP_TEST_NUM returns the number of real tests.
You can go up one level to
the C++ source codes.
Last modified on 05 March 2013.