[View this page in French]

Download LOQO for Windows

The current version is 6.07.

Instructions:

  1. Download the zipped archive loqo.zip, which contains the executable loqo.exe, the subroutine library loqo.lib, C source files loqo.c and hs046.c, and associated header files loqo.h and myalloc.h. The source files illustrate how to use the subroutine library.
  2. Unzip the file.
  3. Contact the author (Robert Vanderbei) for temporary password files loqopasswd.txt and loqosu.txt.
  4. Set the environment variable LOQODIR to point to the directory in which you've put loqopasswd.txt.
  5. Make sure that the environment variable PATH includes the folder in which loqo.exe is placed.
  6. Read the user's manual loqo405.pdf.
  7. Obtain a permanent license before the temporary one expires. For licensing information, click here

Download LOQO for UNIX/LINUX


The current version is 7.00 (or earlier, depending on platform).

Special note regarding convex QP models. Prior to version 5.00, QP models were automatically assumed to be convex. This is no longer true: QP's are assumed to be nonconvex (and hence are treated differently by the algorithm) unless otherwise specified. To specify that a problem is convex, just include the keyword "convex" in the loqo_options string. We strongly suggest that this convexity assertion be explicitly made for any NLP that is known to be convex.


Instructions:

  1. Download LOQO for your platform from the list below.
  2. Uncompress and untar the file.
  3. Contact the author (Robert Vanderbei) for temporary password files loqopasswd.txt and loqosu.txt.
  4. Set the environment variable LOQODIR to point to the directory in which you've put loqopasswd.txt.
  5. Make sure that the environment variable PATH includes the folder in which loqo.exe is placed.
  6. Read the user's manual loqo405.pdf.
  7. Obtain a permanent license before the temporary one expires. For licensing information, click here

Version 7.02

Version 7.00

Version 6.07

Version 6.06

Version 6.03

Version 6.00

Version 5.06

Version 5.05

Download LOQO 6.01 Student Version for Windows

To use LOQO with the 32-bit Student Edition of AMPL (download here)
Note: Password files not required for student version

Put these all in the same directory:
ampl.exe
amplfunc.dll
loqo.exe

To run AMPL,

  1. Double click on ampl.exe in Windows Explorer. You should have an AMPL prompt.
  2. To solve models using LOQO, issue the command
    option solver loqo;
    before solve;

Download LOQO 6.06 Student Version for Linux

To use LOQO with the 32-bit Student Edition of AMPL (download here)
Note: Password files not required for student version

Click here to download loqo: loqo

You'll need to get the student version of AMPL from the AMPL website.