profile on
test_all
 TEST_ALL test the Factorize package (factorize, inverse, and related)
 
  If you have editted the Factorize package, type "clear classes" before
  running any tests.
 
  Example
    test_all                % run all tests
    test_all (0) ;          % do not run performance tests
 
  See also <a href="matlab:help factorize">factorize</a>, <a href="matlab:help inverse">inverse</a>, <a href="matlab:help test_performance">test_performance</a>, <a href="matlab:help test_accuracy">test_accuracy</a>, <a href="matlab:help test_disp">test_disp</a>,
  <a href="matlab:help test_errors">test_errors</a>


----------Dense LU factorization:

factorize: strategy default, A has size 3-by-3, full.
factorize: try LU ... OK.
F = 
  class: factorization_lu_dense
  dense LU factorization: A(p,:) = L*U
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    U: [3x3 double]
    p: [3 2 1]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 3
  A_condest: 6.821417e+02
S = 
  class: factorization_lu_dense
  dense LU factorization: A(p,:) = L*U
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    U: [3x3 double]
    p: [3 2 1]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 3
  A_condest: 6.821417e+02
error: 0

Dense LU With an imaginary F.alpha: F = 
  class: factorization_lu_dense
  dense LU factorization: A(p,:) = L*U
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    U: [3x3 double]
    p: [3 2 1]
  is_inverse: 0
  is_ctrans: 0
  alpha: 3.14159 + (2)i
  A_rank: 3
  A_condest: 6.821417e+02
error 6.24741e-12

----------Sparse LU factorization:

factorize: strategy default, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try LU ... OK.
F = 
  class: factorization_lu_sparse
  sparse LU factorization: P*(R\A)*Q = L*U
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    U: [3x3 double]
    P: [3x3 double]
    Q: [3x3 double]
    R: [3x3 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 3
  A_condest: 1.004378e+02
S = 
  class: factorization_lu_sparse
  sparse LU factorization: P*(R\A)*Q = L*U
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    U: [3x3 double]
    P: [3x3 double]
    Q: [3x3 double]
    R: [3x3 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 3
  A_condest: 1.004378e+02
error: 3.12642e-17

----------Dense Cholesky factorization:

factorize: strategy default, A has size 3-by-3, full.
factorize: try CHOL ... OK.
F = 
  class: factorization_chol_dense
  dense Cholesky factorization: A = R'*R
  A: [3x3 double]
  Factors:
    R: [3x3 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 3
S = 
  class: factorization_chol_dense
  dense Cholesky factorization: A = R'*R
  A: [3x3 double]
  Factors:
    R: [3x3 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 3
error: 1.36648e-17

----------Sparse Cholesky factorization:

factorize: strategy default, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try CHOL ... OK.
F = 
  class: factorization_chol_sparse
  sparse Cholesky factorization: P'*A*P = L*L'
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    P: [3x3 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 3
S = 
  class: factorization_chol_sparse
  sparse Cholesky factorization: P'*A*P = L*L'
  A: [3x3 double]
  Factors:
    L: [3x3 double]
    P: [3x3 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 3
error: 1.36648e-17

----------Dense QR factorization:

factorize: strategy qr, A has size 3-by-2, full.
factorize: try QR of A ... OK.
F = 
  class: factorization_qr_dense
  dense economy QR factorization: A = Q*R
  A: [3x2 double]
  Factors:
    Q: [3x2 double]
    R: [2x2 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
S = 
  class: factorization_qr_dense
  dense economy QR factorization: A = Q*R
  A: [3x2 double]
  Factors:
    Q: [3x2 double]
    R: [2x2 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
error: 6.22897e-16

----------Dense COD factorization:

factorize: strategy default, A has size 3-by-2, full.
factorize: try COD ... OK.
F = 
  class: factorization_cod_dense
  dense COD factorization: A = U*R*V'
  A: [3x2 double]
  Factors:
    U: [3x2 double]
    R: [2x2 double]
    V: [2x2 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
S = 
  class: factorization_cod_dense
  dense COD factorization: A = U*R*V'
  A: [3x2 double]
  Factors:
    U: [3x2 double]
    R: [2x2 double]
    V: [2x2 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
error: 4.71271e-17

----------Sparse COD factorization:

factorize: strategy cod, A has size 3-by-2, sparse with 6 nonzeros.
factorize: try COD ... OK.
F = 
  class: factorization_cod_sparse
  sparse COD factorization: A = U*R*V'
  A: [3x2 double]
  Factors:
    U: [1x1 struct]
    R: [3x2 double]
    V: [1x1 struct]
    r: 2
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
S = 
  class: factorization_cod_sparse
  sparse COD factorization: A = U*R*V'
  A: [3x2 double]
  Factors:
    U: [1x1 struct]
    R: [3x2 double]
    V: [1x1 struct]
    r: 2
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
error: 6.55681e-16

----------Dense QR factorization of A':

factorize: strategy qr, A has size 2-by-3, full.
factorize: try QR of A' ... OK.
F = 
  class: factorization_qrt_dense
  dense economy QR factorization: A' = Q*R
  A: [2x3 double]
  Factors:
    Q: [3x2 double]
    R: [2x2 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
S = 
  class: factorization_qrt_dense
  dense economy QR factorization: A' = Q*R
  A: [2x3 double]
  Factors:
    Q: [3x2 double]
    R: [2x2 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
error: 9.85539e-16

----------Sparse QR factorization:

factorize: strategy default, A has size 3-by-2, sparse with 6 nonzeros.
factorize: try QR of A ... OK.
F = 
  class: factorization_qr_sparse
  sparse QR factorization of A: (A*P)'*A*P = R'*R
  A: [3x2 double]
  Factors:
    R: [2x2 double]
    P: [2x2 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
S = 
  class: factorization_qr_sparse
  sparse QR factorization of A: (A*P)'*A*P = R'*R
  A: [3x2 double]
  Factors:
    R: [2x2 double]
    P: [2x2 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
error: 5.55647e-16

----------Sparse QR factorization of A':

factorize: strategy default, A has size 2-by-3, sparse with 6 nonzeros.
factorize: try QR of A' ... OK.
F = 
  class: factorization_qrt_sparse
  sparse QR factorization of A': (P*A)*(P*A)' = R'*R
  A: [2x3 double]
  Factors:
    R: [2x2 double]
    P: [2x2 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
S = 
  class: factorization_qrt_sparse
  sparse QR factorization of A': (P*A)*(P*A)' = R'*R
  A: [2x3 double]
  Factors:
    R: [2x2 double]
    P: [2x2 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_condest: 1.573790e+00
error: 5.55647e-16

----------SVD factorization:

factorize: strategy svd, A has size 3-by-2, sparse with 6 nonzeros.
factorize: try SVD ... OK.
F = 
  class: factorization_svd
  singular value decomposition: A = U*S*V'
  A: [3x2 double]
  Factors:
    U: [3x3 double]
    S: [2x1 double]
    V: [2x2 double]
    r: 2
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_cond: 4.580233e+00
S = 
  class: factorization_svd
  singular value decomposition: A = U*S*V'
  A: [3x2 double]
  Factors:
    U: [3x3 double]
    S: [2x1 double]
    V: [2x2 double]
    r: 2
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 2
  A_cond: 4.580233e+00
error: 5.24545e-16

----------Dense LDL factorization:

factorize: strategy ldl, A has size 6-by-6, full.
factorize: try LDL ... OK.
F = 
  class: factorization_ldl_dense
  dense LDL factorization: A(p,p) = L*D*L'
  A: [6x6 double]
  Factors:
    L: [6x6 double]
    D: [6x6 double]
    p: [1 4 3 6 5 2]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 6
  A_condest: 3.116758e+00
S = 
  class: factorization_ldl_dense
  dense LDL factorization: A(p,p) = L*D*L'
  A: [6x6 double]
  Factors:
    L: [6x6 double]
    D: [6x6 double]
    p: [1 4 3 6 5 2]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 6
  A_condest: 3.116758e+00
error: 4.60596e-17

----------Sparse LDL factorization:

factorize: strategy ldl, A has size 6-by-6, sparse with 18 nonzeros.
factorize: try LDL ... OK.
F = 
  class: factorization_ldl_sparse
  sparse LDL factorization: P'*A*P = L*D*L'
  A: [6x6 double]
  Factors:
    L: [6x6 double]
    D: [6x6 double]
    P: [6x6 double]
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 6
  A_condest: 3.364501e+00
S = 
  class: factorization_ldl_sparse
  sparse LDL factorization: P'*A*P = L*D*L'
  A: [6x6 double]
  Factors:
    L: [6x6 double]
    D: [6x6 double]
    P: [6x6 double]
  is_inverse: 1
  is_ctrans: 0
  alpha: 1
  A_rank: 6
  A_condest: 3.364501e+00
error: 9.21191e-17

----------Dense QR and QR' with scalar A and sparse b:
F = 
  class: factorization_qr_dense
  dense economy QR factorization: A = Q*R
  A: [1x1 double]
  Factors:
    Q: 1
    R: 3.1416
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 1
  A_condest: 1
F = 
  class: factorization_qrt_dense
  dense economy QR factorization: A' = Q*R
  A: [1x1 double]
  Factors:
    Q: 1
    R: 3.1416
  is_inverse: 0
  is_ctrans: 0
  alpha: 1
  A_rank: 1
  A_condest: 1

All disp tests passed, max error: 6.24741e-12

Testing error handling (error messages are expected)

Expected error: [Matrix must be 2D.]

factorize: strategy gunk, A has size 4-by-4, full.
Expected error: [unrecognized strategy.]
Expected error: [COD is not designed for sparse matrices.  Use COD_SPARSE instead.]
Expected error: [RQ is not designed for sparse matrices.]
Expected error: [B\F where F=inverse(A) requires the explicit computation of the inverse.
This is ill-advised, so it is never done automatically.
To force it, use B\double(F) instead of B\F.
]
Expected error: [F/B where F=inverse(A) requires the explicit computation of the inverse.
This is ill-advised, so it is never done automatically.
To force it, use double(F)/B instead of F/B.
]
Expected error: [COD_SPARSE is not designed for full matrices.  Use COD instead.]

factorize: strategy default, A has size 3-by-3, full.
factorize: try CHOL ... failed.
factorize: Undefined function or method 'chol' for input arguments of type 'logical'.
factorize: try LDL ... failed.
factorize: Undefined function or method 'ldl' for input arguments of type 'char'.
factorize: try LU ... failed.
factorize: Undefined function or method 'lu' for input arguments of type 'char'.
factorize: try COD ... failed.
factorize: First argument must be single or double.

Expected error: [First argument must be single or double.]

factorize: strategy default, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try CHOL ... failed.
factorize: Undefined function or method 'chol' for input arguments of type 'char'.
factorize: try LDL ... failed.
factorize: Undefined function or method 'ldl' for input arguments of type 'logical'.
factorize: try LU ... failed.
factorize: Undefined function or method 'lu' for input arguments of type 'logical'.
factorize: try COD ... failed.
factorize: matrix type not supported

Expected error: [matrix type not supported]

factorize: strategy symmetric, A has size 3-by-3, full.
factorize: try CHOL ... failed.
factorize: Undefined function or method 'chol' for input arguments of type 'logical'.
factorize: try LDL ... failed.
factorize: Undefined function or method 'ldl' for input arguments of type 'char'.
factorize: try LU ... failed.
factorize: Undefined function or method 'lu' for input arguments of type 'char'.
factorize: try COD ... failed.
factorize: First argument must be single or double.

Expected error: [First argument must be single or double.]

factorize: strategy symmetric, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try CHOL ... failed.
factorize: Undefined function or method 'chol' for input arguments of type 'char'.
factorize: try LDL ... failed.
factorize: Undefined function or method 'ldl' for input arguments of type 'logical'.
factorize: try LU ... failed.
factorize: Undefined function or method 'lu' for input arguments of type 'logical'.
factorize: try COD ... failed.
factorize: matrix type not supported

Expected error: [matrix type not supported]

factorize: strategy qr, A has size 3-by-3, full.
factorize: try QR of A ... failed.
factorize: First argument must be single or double.

Expected error: [First argument must be single or double.]

factorize: strategy qr, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try QR of A ... failed.
factorize: A must be double

Expected error: [A must be double]

factorize: strategy lu, A has size 3-by-3, full.
factorize: try LU ... failed.
factorize: Undefined function or method 'lu' for input arguments of type 'char'.

Expected error: [Undefined function or method 'lu' for input arguments of type 'char'.]

factorize: strategy lu, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try LU ... failed.
factorize: Undefined function or method 'lu' for input arguments of type 'logical'.

Expected error: [Undefined function or method 'lu' for input arguments of type 'logical'.]

factorize: strategy ldl, A has size 3-by-3, full.
factorize: try LDL ... failed.
factorize: Undefined function or method 'ldl' for input arguments of type 'char'.

Expected error: [Undefined function or method 'ldl' for input arguments of type 'char'.]

factorize: strategy ldl, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try LDL ... failed.
factorize: Undefined function or method 'ldl' for input arguments of type 'logical'.

Expected error: [Undefined function or method 'ldl' for input arguments of type 'logical'.]

factorize: strategy chol, A has size 3-by-3, full.
factorize: try CHOL ... failed.
factorize: Undefined function or method 'chol' for input arguments of type 'logical'.

Expected error: [Undefined function or method 'chol' for input arguments of type 'logical'.]

factorize: strategy chol, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try CHOL ... failed.
factorize: Undefined function or method 'chol' for input arguments of type 'char'.

Expected error: [Undefined function or method 'chol' for input arguments of type 'char'.]

factorize: strategy svd, A has size 3-by-3, full.
factorize: try SVD ... failed.
factorize: Undefined function or method 'svd' for input arguments of type 'logical'.

Expected error: [Undefined function or method 'svd' for input arguments of type 'logical'.]

factorize: strategy svd, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try SVD ... failed.
factorize: Undefined function or method 'svd' for input arguments of type 'logical'.

Expected error: [Undefined function or method 'svd' for input arguments of type 'logical'.]

factorize: strategy cod, A has size 3-by-3, full.
factorize: try COD ... failed.
factorize: First argument must be single or double.

Expected error: [First argument must be single or double.]

factorize: strategy cod, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try COD ... failed.
factorize: matrix type not supported

Expected error: [matrix type not supported]

factorize: strategy qr, A has size 3-by-4, sparse with 12 nonzeros.
factorize: try QR of A' ... failed.
factorize: A must be double

Expected error: [A must be double]

factorize: strategy ldl, A has size 3-by-3, full.
factorize: try LDL ... failed.
factorize: Matrix is singular to working precision.

factorize: strategy ldl, A has size 3-by-2, full.
factorize: try LDL ... failed.
factorize: Matrix must be square.

factorize: strategy ldl, A has size 2-by-3, full.
factorize: try LDL ... failed.
factorize: Matrix must be square.

factorize: strategy ldl, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try LDL ... failed.
factorize: Matrix is singular to working precision.

factorize: strategy ldl, A has size 3-by-2, sparse with 0 nonzeros.
factorize: try LDL ... failed.
factorize: Matrix must be square.

factorize: strategy ldl, A has size 2-by-3, sparse with 0 nonzeros.
factorize: try LDL ... failed.
factorize: Matrix must be square.

factorize: strategy chol, A has size 3-by-3, full.
factorize: try CHOL ... failed.
factorize: Matrix must be positive definite.

factorize: strategy chol, A has size 3-by-2, full.
factorize: try CHOL ... failed.
factorize: Matrix must be square.

factorize: strategy chol, A has size 2-by-3, full.
factorize: try CHOL ... failed.
factorize: Matrix must be square.

factorize: strategy chol, A has size 3-by-3, sparse with 9 nonzeros.
factorize: try CHOL ... failed.
factorize: Matrix must be positive definite.

factorize: strategy chol, A has size 3-by-2, sparse with 0 nonzeros.
factorize: try CHOL ... failed.
factorize: Matrix must be square.

factorize: strategy chol, A has size 2-by-3, sparse with 0 nonzeros.
factorize: try CHOL ... failed.
factorize: Matrix must be square.

factorize: strategy lu, A has size 3-by-2, full.
factorize: try LU ... failed.
factorize: LU for rectangular matrices not supported.  Use QR.

Expected error: [LU for rectangular matrices not supported.  Use QR.]

factorize: strategy lu, A has size 3-by-2, sparse with 6 nonzeros.
factorize: try LU ... failed.
factorize: LU for rectangular matrices not supported.  Use QR.

Expected error: [LU for rectangular matrices not supported.  Use QR.]

factorize: strategy ldl, A has size 3-by-2, full.
factorize: try LDL ... failed.
factorize: Matrix must be square.

Expected error: [Matrix must be square.]

factorize: strategy ldl, A has size 3-by-2, sparse with 6 nonzeros.
factorize: try LDL ... failed.
factorize: Matrix must be square.

Expected error: [Matrix must be square.]

factorize: strategy chol, A has size 3-by-2, full.
factorize: try CHOL ... failed.
factorize: Matrix must be square.

Expected error: [Matrix must be square.]

factorize: strategy chol, A has size 3-by-2, sparse with 6 nonzeros.
factorize: try CHOL ... failed.
factorize: Matrix must be square.

Expected error: [Matrix must be square.]

Expected error: [QR(A) method requires m>=n.]

Expected error: [QR of A requires m >= n.]

Expected error: [QR(A') method requires m<=n.]

Expected error: [QR of A' requires m < n.]

factorize: strategy ldl, A has size 2-by-2, full.
factorize: try LDL ... failed.
factorize: Matrix is singular to working precision.

Expected error: [Matrix is singular to working precision.]

factorize: strategy ldl, A has size 2-by-2, sparse with 0 nonzeros.
factorize: try LDL ... failed.
factorize: Matrix is singular to working precision.

Expected error: [Matrix is singular to working precision.]

factorize: strategy chol, A has size 2-by-2, full.
factorize: try CHOL ... failed.
factorize: Matrix must be positive definite.

Expected error: [Matrix must be positive definite.]

factorize: strategy chol, A has size 2-by-2, sparse with 0 nonzeros.
factorize: try CHOL ... failed.
factorize: Matrix must be positive definite.

Expected error: [Matrix must be positive definite.]

factorize: strategy default, A has size 3-by-2, full.
factorize: try COD ... OK.

Expected error: [Cell contents reference from a non-cell array object.]
Expected error: [Improper index matrix reference.]
Expected error: [Reference to non-existent field 'L'.]
Expected error: [Reference to non-existent field 'junk'.]

factorize: strategy default, A has size 2-by-2, full.
factorize: try LU ... OK.

Expected error: [Undefined function or method 'cholupdate' for input arguments of type 'factorization_lu_dense'.]
Expected error: [Undefined function or method 'choldowndate' for input arguments of type 'factorization_lu_dense'.]

Expected error: [Matrix must be square.]

Expected error: [A is rectangular.  Use the 2 norm.]

Expected error: [unrecognized kind]

Expected error: [Third argument must be '+' or '-'.]

All error-handing tests passed

----- Test functions:

norm(A,1), exact:             0
  MATLAB normest1(A)          0

norm (inv(A),1) exact:        0
  MATLAB normest1 (inv (A)):  -1
  normest1 (inverse (F)):     0

  cond (A,1), exact:          -1
  MATLAB condest(A):          0
  condest(F):                 0
  condest(inverse(A)):        0
  cond (A,2), exact:          -1
  cond (F,2), exact:          -1
  rankest 0 0
  cheap condest:              0
K =
             A: []
       Factors: [1x1 struct]
    is_inverse: 0
     is_ctrans: 0
         alpha: 1
        A_rank: 0
        A_cond: []
          kind: 'dense LDL factorization: A(p,p) = L*D*L''
K =
             A: []
       Factors: [1x1 struct]
    is_inverse: 1
     is_ctrans: 1
         alpha: 1
        A_rank: 0
        A_cond: []
          kind: 'dense LDL factorization: A(p,p) = L*D*L''

norm(A,1), exact:             3.07802
  MATLAB normest1(A)          3.07802

norm (inv(A),1) exact:        1.94889e+06
  MATLAB normest1 (inv (A)):  1.94889e+06
  normest1 (inverse (F)):     1.94889e+06

  cond (A,1), exact:          -1
  MATLAB condest(A):          5.99871e+06
  condest(F):                 5.99871e+06
  condest(inverse(A)):        5.99871e+06
  cond (A,2), exact:          -1
  cond (F,2), exact:          -1
  rankest 3 3
K =
             A: [3x3 double]
       Factors: [1x1 struct]
    is_inverse: 0
     is_ctrans: 0
         alpha: 1
        A_rank: 3
        A_cond: []
          kind: 'dense Cholesky factorization: A = R'*R'
K =
             A: [3x3 double]
       Factors: [1x1 struct]
    is_inverse: 1
     is_ctrans: 1
         alpha: 1
        A_rank: 3
        A_cond: []
          kind: 'dense Cholesky factorization: A = R'*R'

norm(A,1), exact:             1.99749
  MATLAB normest1(A)          1.99749

norm (inv(A),1) exact:        1785.44
  MATLAB normest1 (inv (A)):  1785.44
  normest1 (inverse (F)):     1785.44

  cond (A,1), exact:          3566.41
  MATLAB condest(A):          3566.41
  condest(F):                 3566.41
  condest(inverse(A)):        3566.41
  cond (A,2), exact:          2050.35
  cond (F,2), exact:          2050.35
  rankest 3 3
K =
             A: [3x3 double]
       Factors: [1x1 struct]
    is_inverse: 0
     is_ctrans: 0
         alpha: 1
        A_rank: 3
        A_cond: 2.0503e+03
          kind: 'singular value decomposition: A = U*S*V''
K =
             A: [3x3 double]
       Factors: [1x1 struct]
    is_inverse: 1
     is_ctrans: 1
         alpha: 1
        A_rank: 3
        A_cond: 2.0503e+03
          kind: 'singular value decomposition: A = U*S*V''

norm(A,1), exact:             6.43078
  MATLAB normest1(A)          6.43078

norm (inv(A),1) exact:        14.3894
  MATLAB normest1 (inv (A)):  14.3894
  normest1 (inverse (F)):     14.3894

  cond (A,1), exact:          -1
  MATLAB condest(A):          92.5354
  condest(F):                 92.5354
  condest(inverse(A)):        92.5354
  cond (A,2), exact:          -1
  cond (F,2), exact:          -1
  rankest 10 10
  cheap condest:              2.49707
K =
             A: [10x10 double]
       Factors: [1x1 struct]
    is_inverse: 0
     is_ctrans: 0
         alpha: 1
        A_rank: 10
        A_cond: []
          kind: 'dense LU factorization: A(p,:) = L*U'
K =
             A: [10x10 double]
       Factors: [1x1 struct]
    is_inverse: 1
     is_ctrans: 1
         alpha: 1
        A_rank: 10
        A_cond: []
          kind: 'dense LU factorization: A(p,:) = L*U'

Methods for class factorization_svd:

abs                isa                mldivide           rankest            
cond               isempty            mldivide_subclass  size               
condest            isfield            mrdivide           struct             
ctranspose         isfloat            mrdivide_subclass  subsref            
disp               isnumeric          mtimes             svd                
double             isreal             norm               uminus             
end                isscalar           null               uplus              
error_check        issingle           orth               
factorization_svd  issparse           pinv               
inverse            isvector           rank               


norm(A,1), exact:             32.5678
  MATLAB normest1(A)          32.5678

norm (inv(A),1) exact:        0.0679415
  MATLAB normest1 (inv (A)):  0.0652449
  normest1 (inverse (F)):     0.0652449

  cond (A,1), exact:          2.2127
  MATLAB condest(A):          2.12488
  condest(F):                 2.12488
  condest(inverse(A)):        2.12488
  cond (A,2), exact:          1.70306
  cond (F,2), exact:          1.70306
  rankest 10 10
K =
             A: [10x10 double]
       Factors: [1x1 struct]
    is_inverse: 0
     is_ctrans: 0
         alpha: 1
        A_rank: 10
        A_cond: 1.7031
          kind: 'singular value decomposition: A = U*S*V''
K =
             A: [10x10 double]
       Factors: [1x1 struct]
    is_inverse: 1
     is_ctrans: 1
         alpha: 1
        A_rank: 10
        A_cond: 1.7031
          kind: 'singular value decomposition: A = U*S*V''

Methods for class factorization_chol_dense:

abs                       isempty                   mrdivide                  
cholupdate                isfield                   mrdivide_subclass         
condest                   isfloat                   mtimes                    
ctranspose                isnumeric                 rankest                   
disp                      isreal                    size                      
double                    isscalar                  struct                    
end                       issingle                  subsref                   
error_check               issparse                  uminus                    
factorization_chol_dense  isvector                  uplus                     
inverse                   mldivide                  
isa                       mldivide_subclass         


norm(A,1), exact:             32.5678
  MATLAB normest1(A)          32.5678

norm (inv(A),1) exact:        0.0679415
  MATLAB normest1 (inv (A)):  0.0652449
  normest1 (inverse (F)):     0.0652449

  cond (A,1), exact:          -1
  MATLAB condest(A):          2.12488
  condest(F):                 2.12488
  condest(inverse(A)):        2.12488
  cond (A,2), exact:          -1
  cond (F,2), exact:          -1
  rankest 10 10
K =
             A: [10x10 double]
       Factors: [1x1 struct]
    is_inverse: 0
     is_ctrans: 0
         alpha: 1
        A_rank: 10
        A_cond: []
          kind: 'dense Cholesky factorization: A = R'*R'
K =
             A: [10x10 double]
       Factors: [1x1 struct]
    is_inverse: 1
     is_ctrans: 1
         alpha: 1
        A_rank: 10
        A_cond: []
          kind: 'dense Cholesky factorization: A = R'*R'
........................................................................
test_functions, max error: 1.38512e-10

Testing accuracy:

factorize: strategy ldl, A has size 4-by-4, full.
factorize: try LDL ... OK.
..please wait
test  1 of 14 ..........................................................
test  2 of 14 ..........................................................
test  3 of 14 ..........................................................
test  4 of 14 ..........................................................
test  5 of 14 ..........................................................
test  6 of 14 ........................................................
test  7 of 14 ..........................................................
test  8 of 14 ........................................................
test  9 of 14 ..........................................................
test 10 of 14 ........................................................
test 11 of 14 ..........................................................
test 12 of 14 ........................................................
test 13 of 14 ..........................................................
test 14 of 14 ........................................................
.
err so far: 2.92744e-12
please wait .........................................................
max error is OK: 8.56286e-09
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test_all_svd error so far: 1.99577e-14
Testing on gallery ('randsvd',50) matrices:
..
Final test_all_svd error: 9.05166e-10
test COD, COD_SPARSE, and RQ: error 1.07415e-15

Performance comparisons of 4 methods:
    backslash:  A\b, or L\b (and related) for solve times.
    linsolve:   a built-in MATLAB function
    factorize:  the factorization object
    inv:        x=inv(A)*b, the explicit inverse (ack!)
Run times are in seconds.
Time relative to best time is in parentheses (lower is better).

------------------ For unsymmetric matrices:

Compare factorization times:
n   50 tbest   0.000231 :
    backslash ( 1.04)
    linsolve  ( 1.00)
    factorize ( 5.57)
    inv       ( 1.50)
n  100 tbest   0.000829 :
    backslash ( 1.11)
    linsolve  ( 1.00)
    factorize ( 2.36)
    inv       ( 1.96)
n  500 tbest   0.049129 :
    backslash ( 1.05)
    linsolve  ( 1.00)
    factorize ( 1.09)
    inv       ( 2.41)
n 1000 tbest   0.332374 :
    backslash ( 1.04)
    linsolve  ( 1.01)
    factorize ( 1.00)
    inv       ( 2.51)

Compare solve times:
n   50 tbest   0.000013 :
    backslash ( 2.53)
    linsolve  ( 2.94)
    factorize (30.20)
    inv       ( 1.00)
n  100 tbest   0.000023 :
    backslash ( 3.04)
    linsolve  ( 2.46)
    factorize (18.41)
    inv       ( 1.00)
n  500 tbest   0.000423 :
    backslash ( 4.33)
    linsolve  ( 1.78)
    factorize ( 3.21)
    inv       ( 1.00)
n 1000 tbest   0.002432 :
    backslash ( 2.74)
    linsolve  ( 1.32)
    factorize ( 1.48)
    inv       ( 1.00)

Break-even values K for inv vs the other methods
(# of solves must exceed K for inv(A)*b to be faster):
n   50
    # solves vs backslash       5.2
    # solves vs linsolve:       4.4
    # solves vs factorize:      1.0
n  100
    # solves vs backslash      14.8
    # solves vs linsolve:      23.5
    # solves vs factorize:      1.0
n  500
    # solves vs backslash      47.3
    # solves vs linsolve:     210.7
    # solves vs factorize:     69.1
n 1000
    # solves vs backslash     115.7
    # solves vs linsolve:     645.9
    # solves vs factorize:    431.0

------------------ For positive definite matrices:

Compare factorization times:
n   50 tbest   0.000172 :
    backslash ( 1.10)
    linsolve  ( 1.00)
    factorize ( 5.59)
    inv       ( 1.75)
n  100 tbest   0.000536 :
    backslash ( 1.17)
    linsolve  ( 1.00)
    factorize ( 2.42)
    inv       ( 2.29)
n  500 tbest   0.023547 :
    backslash ( 1.25)
    linsolve  ( 1.12)
    factorize ( 1.00)
    inv       ( 3.90)
n 1000 tbest   0.145861 :
    backslash ( 1.27)
    linsolve  ( 1.18)
    factorize ( 1.00)
    inv       ( 5.11)

Compare solve times:
n   50 tbest   0.000013 :
    backslash ( 3.15)
    linsolve  ( 2.71)
    factorize (29.95)
    inv       ( 1.00)
n  100 tbest   0.000024 :
    backslash ( 3.30)
    linsolve  ( 2.22)
    factorize (17.60)
    inv       ( 1.00)
n  500 tbest   0.000440 :
    backslash ( 3.33)
    linsolve  ( 1.00)
    factorize ( 2.07)
    inv       ( 1.01)
n 1000 tbest   0.002613 :
    backslash ( 2.49)
    linsolve  ( 1.00)
    factorize ( 1.19)
    inv       ( 1.05)

Break-even values K for inv vs the other methods
(# of solves must exceed K for inv(A)*b to be faster):
n   50
    # solves vs backslash       3.9
    # solves vs linsolve:       5.6
    # solves vs factorize:      1.0
n  100
    # solves vs backslash      11.0
    # solves vs linsolve:      23.9
    # solves vs factorize:      1.0
n  500
    # solves vs backslash      61.0
    # solves vs linsolve:       Inf
    # solves vs factorize:    146.1
n 1000
    # solves vs backslash     148.4
    # solves vs linsolve:       Inf
    # solves vs factorize:   1616.2

Schur complement, S=A-B*inv(D)*C or A-B(D\C),
where A, B, C, and D are square and unsymmetric.
"inverse" means S=A-B*inverse(D)*C, which does not actually
use the inverse, but uses the factorization object instead.
n   50 tbest   0.000482 :
    backslash ( 1.01)
    linsolve  ( 1.00)
    factorize ( 3.45)
    inv       ( 4.01)
n  100 tbest   0.002334 :
    backslash ( 1.05)
    linsolve  ( 1.00)
    factorize ( 1.70)
    inv       ( 1.81)
n  500 tbest   0.234306 :
    backslash ( 1.00)
    linsolve  ( 1.02)
    factorize ( 1.05)
    inv       ( 1.10)
n 1000 tbest   1.736168 :
    backslash ( 1.00)
    linsolve  ( 1.03)
    factorize ( 1.24)
    inv       ( 1.02)

All tests passed, maximum error OK: 8.56286e-09
diary off