Routine svd from Matlab 7.6.0.324 (R2008a) used to calculate the singular values.

Matrix properties (click for a legend) | |

number of rows | 536 |

number of columns | 1,777 |

structural full rank? | yes |

structural rank | 536 |

numerical rank | 535 |

dimension of the numerical null space | 1,242 |

numerical rank / min(size(A)) | 0.99813 |

Euclidean norm of A | 16 |

calculated singular value # 535 | 0.38107 |

numerical rank defined using a tolerance max(size(A))*eps(norm(A)) = | 6.3132e-012 |

calculated singular value # 536 | 1.6128e-014 |

gap in the singular values at the numerical rank: singular value # 535 / singular value # 536 | 2.3628e+013 |

calculated condition number | 9.9207e+014 |

condest | -2 |

nonzeros | 3,558 |

# of blocks from dmperm | 1 |

# strongly connected comp. | 1 |

entries not in dmperm blocks | 0 |

explicit zero entries | 0 |

nonzero pattern symmetry | 0% |

numeric value symmetry | 0% |

type | integer |

structure | rectangular |

Cholesky candidate? | no |

positive definite? | no |

author | J. Reid |

editor | D. Gay |

date | 1978 |

kind | linear programming problem |

2D/3D problem? | no |

SJid | 300 |

UFid | 683 |

Additional fields | size and type |

b | full 536-by-1 |

c | full 1777-by-1 |

lo | full 1777-by-1 |

hi | full 1777-by-1 |

z0 | full 1-by-1 |

Notes:

A Netlib LP problem, in lp/data. For more information send email to netlib@ornl.gov with the message: send index from lp send readme from lp/data ------------------------------------------------------------------------------ This LP problem is the source of three sparse matrices in the Harwell/Boeing sparse matrix collection: SHL_0, SHL_200, and SHL_400. Those three matrices are square, nonsingular basis matrices that occured during the solution of SHELL. ------------------------------------------------------------------------------ The following are relevant excerpts from lp/data/readme (by David M. Gay): The column and nonzero counts in the PROBLEM SUMMARY TABLE below exclude slack and surplus columns and the right-hand side vector, but include the cost row. We have omitted other free rows and all but the first right-hand side vector, as noted below. The byte count is for the MPS compressed file; it includes a newline character at the end of each line. These files start with a blank initial line intended to prevent mail programs from discarding any of the data. The BR column indicates whether a problem has bounds or ranges: B stands for "has bounds", R for "has ranges". The BOUND-TYPE TABLE below shows the bound types present in those problems that have bounds. The optimal value is from MINOS version 5.3 (of Sept. 1988) running on a VAX with default options. PROBLEM SUMMARY TABLE Name Rows Cols Nonzeros Bytes BR Optimal Value SHELL 537 1775 4900 38049 B 1.2088253460E+09 BOUND-TYPE TABLE SHELL UP LO FX From John Reid.

Ordering statistics: | AMD |
METIS |

nnz(V) for QR, upper bound nnz(L) for LU | 56,680 | 51,183 |

nnz(R) for QR, upper bound nnz(U) for LU | 4,266 | 4,546 |

*Maintained by Leslie Foster, last updated 24-Apr-2009.*

Entries 5 through 14 in the table of matrix properties and the singular

value plot were created using SJsingular code. The other plots

and statistics are produced using utilities from
the SuiteSparse package.

Matrix color plot pictures by cspy, a MATLAB function in the CSparse package.