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Retrieves the total number of nodes processed in the branch-and-bound algorithm from a successfully solved lpSolve linear program model object.
get.total.nodes(lprec)
an lpSolve linear program model object.
a single integer value giving the total number of nodes processed.
The output of this function is only applicable for models containing integer variables.
http://lpsolve.sourceforge.net/5.5/index.htm