## LPnetlib/lp_afiro

Netlib LP problem afiro: minimize c'*x, where Ax=b, lo<=x<=hi

Name | lp_afiro |
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Group | LPnetlib |

Matrix ID | 597 |

Num Rows | 27 |

Num Cols | 51 |

Nonzeros | 102 |

Pattern Entries | 102 |

Kind | Linear Programming Problem |

Symmetric | No |

Date | |

Author | M. Saunders |

Editor | D. Gay |

SVD Statistics | |
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Matrix Norm | 6.781127e+00 |

Minimum Singular Value | 6.056046e-01 |

Condition Number | 1.119728e+01 |

Rank | 27 |

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

Null Space Dimension | 0 |

Full Numerical Rank? | yes |

Download Singular Values | MATLAB |

Download | MATLAB Rutherford Boeing Matrix Market |
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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 send minos from lp/data 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 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 AFIRO 28 32 88 794 -4.6475314286E+02 From Michael Saunders, Systems Optimization Laboratory at Stanford University. The following are relevant excerts from lp/data/minos (by Michael Saunders), regarding experience with MINOS 5.0 on the problems he provided: (unscaled) (scaled) File Name Rows Cols Elems Optimal Objective Itns Time Itns Time ---- -------- ---- ---- ----- ----------------- ---- ---- ---- ---- 1. AFIRO 28 32 88 -4.6475314E+02 6 0.5 6 0.5 * Objective is the first row of type N. It is minimized except as shown. * Itns is the number of iterations required to solve the problem by the primal simplex method, as implemented in the Fortran code MINOS 5.0 (May 1985), using default values for all parameters. (The initial basis is triangular.) * Time is the processor time required on an IBM 3081K. The MINOS source code was compiled with the IBM Fortran 77 compiler VS FORTRAN, using the options NOSDUMP, NOSYM and OPT(3). |