(a) The problem is the space between '^' and '2'. SCIP expects this to be "^2". I don't think that adding a space between '^' and '2' is allowed, too. (b) Yes, linearization via outer-approximation. (c) AMPL, GAMS, ZIMPL....

first of all thanks for submitting this problem. We have identified two major problems. Your model seams to be numerically unstable because after some iterations some variable bounds are set to something with the magnitude of 1^{13} before and 1^{-4} behind the comma. In floating point arithmetic there are 15-16...

While lower bounds are a local property special to each node (since they are usually inferred from the optimal LP-relaxation objective at this node, or the node children lower bounds in case they have already been solved, upper bounds come from primal solutions for your problem and are therefore globally...

Your version of GCC is too old. You may either use a newer version (recommended), or try compiling with LEGACY=true. This will disable the rational solving mode.

The problem was that I was installing the scip-3.1.1.tgz rather than scipoptsuite-3.1.1.tgz. Running make on scipoptsuite-3.1.1.tgz runs perfectly fine.

The problem is that "gmp" is missing on your system. You have two options: Install the gmp library Compile SoPlex without gmp. For doing this call: make soplex GMP=false A similar issue might come up with the zlib. If this library is not installed on your system. If this is...

matlab,nonlinear-optimization,scip

Ok, so after enlightenment by J. Currie, an Opti toolbox developer, I understood the cause of the problem above. The first call to the objective with a vector of scipvar variables is actually a parser sweeping the objective function to see if it can be properly mapped to something that...