According to Vapnik’s formulation (Vapnick, 1999), in oneagainstall support vector machines, an n class problem is converted into n two-class problems and for the ith two-class problems, class i is separated from the remaining classes. But by these formulation unclassifiable regions exists, if we use the discrete decision function. We can resolve unclassifiable regions by determining the decision functions all-at-once (Vapnick, 1999).