**Matrix: DRIVCAV/cavity04**

Description: Driven Cavity 5 x 5, Reynolds number: 600

(bipartite graph drawing) | (graph drawing of A+A') |

Matrix properties | |

number of rows | 317 |

number of columns | 317 |

nonzeros | 5,923 |

structural full rank? | yes |

structural rank | 317 |

# of blocks from dmperm | 82 |

# strongly connected comp. | 82 |

explicit zero entries | 1,404 |

nonzero pattern symmetry | 80% |

numeric value symmetry | 0% |

type | real |

structure | unsymmetric |

Cholesky candidate? | no |

positive definite? | no |

author | A. Chapman |

editor | A. Baggag, Y. Saad |

date | 1996 |

kind | subsequent computational fluid dynamics problem |

2D/3D problem? | yes |

Additional fields | size and type |

b | full 317-by-1 |

x | full 317-by-1 |

Notes:

next: - first: DRIVCAV/cavity01 pattern is the same as the transpose of DRIVCAV/cavity01

Ordering statistics: | result |

nnz(chol(P*(A+A'+s*I)*P')) with AMD | 3,959 |

Cholesky flop count | 7.1e+04 |

nnz(L+U), no partial pivoting, with AMD | 7,601 |

nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 5,800 |

nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 15,653 |

*Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1404 explicit zero entries.
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SVD-based statistics: | |

norm(A) | 71.2268 |

min(svd(A)) | 2.01067e-05 |

cond(A) | 3.54245e+06 |

rank(A) | 317 |

sprank(A)-rank(A) | 0 |

null space dimension | 0 |

full numerical rank? | yes |

singular values (MAT file): | click here |

SVD method used: | s = svd (full (A)) ; |

status: | ok |

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*For a description of the statistics displayed above,
click here.
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*Maintained by Tim Davis, last updated 12-Mar-2014.Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.
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