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PRTools manual

setcost

SETCOST

Reset classification cost matrix of mapping

    W = SETCOST(W,COST,LABLIST)

The classification cost matrix of the dataset W is reset to COST W has to be a trained classifier. COST should have size [C,C+1],  if C is the number of classes assigned by W COST(I,J) are the costs of classifying an object of class I as class J. Column C+1 generates an alternative reject class and  may be omitted, yielding a size of [C,C].  An empty cost matrix, COST = [] (default) is interpreted as  COST = ONES(C) - EYE(C) (identical costs of misclassification).

In LABLIST the corresponding class labels may be supplied.  LABLIST may have only class names of the existing labels assigned  by W, stored in W.LABELS.

PRTools contents

PRTools manual