Download LOQO for UNIX/LINUX


The current version is 6.00 (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.


Clicking on the appropriate platform, you will get the executable (with built-in AMPL interface) and the subroutine library.

Perform the following in the order given:

  1. Download LOQO for your platform from the list below.
  2. Uncompress and untar the file.
  3. If there is a file called .loqopasswd in your home directory from a previous installation, remove it.
  4. Download the password file, by right clicking here and then clicking "Save Target As".
  5. Set the environment variable LOQODIR to point to the directory in which you've put loqopasswd.txt.
  6. Obtain a license. For licensing information, click here

Version 5.05

Version 5.06

Version 6.00

Version 6.03

Version 6.06

Version 6.07

Download LOQO for UNIX/LINUX

Download LOQO for UNIX/LINUX


  • Download the password file, by right clicking here and then clicking "Save Target As".