Provided by: coinor-csdp_6.2.0-4_amd64

**NAME**

csdp - semidefinite program solver

**SYNOPSIS**

csdp<problemfile> <finalsolution> <initialsolution>csdp-complement<inputgraph> <outputgraph>csdp-graphtoprob<graph> <problemfile>csdp-randgraph<rand_graph> <file> <n> <p> [<seed>]csdp-theta<graph>

**DESCRIPTION**

This manual page documents briefly thecsdp,csdp-complement,csdp-graphtoprob,csdp-randgraphandcsdp-thetacommands.csdp-- interface to solve general semi-definite programscsdp-complement-- compute the complement of a graph and output it in csdp problem formatcsdp-graphtoprob-- convert graph into csdp problem format filecsdp-randgraph-- generate a random graphcsdp-theta-- solves the Lovasz thetha problem

**OPTIONS**

A summary of options is included below. For a complete description, see/usr/share/doc/coinor-csdp-doc/csdpuser.pdf.csdpinputproblemin the SDPA sparse formatproblemfileis the name of a file containing the SDP problem in SDPA sparse formatfinalsolutionis the optional name of a file in which to save the final solutioninitialsolutionis the optional name of a file from which to take the initial solution. CSDP searches for a file namedparam.csdpin the current directory. If no such file exists, then default values for all of CSDP’s parameters are used. If there is a parameter file, then CSDP reads the parameter values from this file. The default parameter values is given below (can be pasted into a file): axtol=1.0e-8 atytol=1.0e-8 objtol=1.0e-8 pinftol=1.0e8 dinftol=1.0e8 maxiter=100 minstepfrac=0.90 maxstepfrac=0.97 minstepp=1.0e-8 minstepd=1.0e-8 usexzgap=1 tweakgap=0 affine=0 printlevel=1 perturbobj=1 fastmode=0param.csdpfileparameterdescriptionaxtolatytolobjtoltolerances for primal feasibility, dual feasibility, and relative duality gappinftoldinftoltolerances used in determining primal and dual infeasibilitymaxiterplimit the total number of iterations that CSDP may useminstepfracmaxstepfracdetermine how close to the edge of the feasible region CSDP will step. If the primal or dual step is shorter than minstepp or minstepd, then CSDP declares a line search failure.usexzgapIf parameter 0, then CSDP will use the objective function duality gap instead of the tr(XZ) gaptweakgapif set to 1, and usexzgap is set to 0, then CSDP will attempt to "fix" negative duality gaps.affineIf parameter affine is set to 1, then CSDP will take only primal–dual affine steps and not make use of the barrier term. This can be useful for some problems that do not have feasible solutions that are strictly in the interior of the cone of semidefinite ma- trices.printleveldetermines how much debugging information is output. Use printlevel=0 for no output and printlevel=1 for normal output. Higher values of printlevel will generate more debugging output.perturbobjdetermines whether the objective function will be perturbed to help deal with problems that have unbounded optimal solution sets. If per- turbobj is 0, then the objective will not be perturbed. If perturbobj=1, then the objective function will be perturbed by a default amount. Larger values of perturbobj (e.g. 100.0) increase the size of the perturbation. This can be helpful in solving some difficult problems.fastmodedetermines whether or not CSDP will skip certain time consuming operations that slightly improve the accuracy of the solutions. If fastmode is set to 1, then CSDP may be somewhat faster, but also somewhat less accurate.

**SEE** **ALSO**

dsdp5(1),theta(1) The programs are documented fully in the accompanying .pdf documentation which can be found in/usr/share/doc/coinor-csdp-docif the coinor-csdp-doc package is installed.

**AUTHOR**

csdp was written by Brian Borchers et al. This manual page was written by Soeren Sonnenburg <sonne@debian.org>, for the Debian project (but may be used by others). April 11, 2009 CSDP(1)