The function getParmValCPLEX retrieves the names and actual values
  of all IBM ILOG CPLEX parameters, which do not have their default values.
getParmValCPLEX(env)An object of class "'>cplexPtr" as returned by
    openEnvCPLEX. This is basically a pointer to an
    IBM ILOG CPLEX environment.
Either a list containing all non-default parameters and their values or
  NULL.
The IBM ILOG CPLEX home page at https://www.ibm.com/support/knowledgecenter/SSSA5P.