Here is a short description of the modifications brought to the Modulopt collection of problems.

• Version 2.1: in development phase
  1. The Moduloptmatlab companion collection of problems has been defined and filled in with the hanging chain problems considered in the BGLS book. Funny problems.

• Version 2.0: December 17, 2007
  Let's consider that this is the original version of the collection. The real original version was actually developped by Claude Lemaréchal around 1980. It has been made Libopt-compatible in 2007 or so.