SHIFTOP

Shift operating point of classifier

     S = SHIFTOP(D,E,C)
    S = SHIFTOP([],E,C);

Input
D	Dataset, classification matrix (two classes only)
E	Desired error class N for D*TESTC
C	Index of desired class (default: C = 1)

Output
S	Mapping, such that E = TESTC(D*S,[],LABEL)

Description

If D = A*W, with A a test dataset and W a trained classifier, then an ROC curve can be computed and plotted by ER = ROC(D,C), PLOTE(ER). C is the  desired class number for which the error is plotted along the horizontal  axis.  The classifier W can be given any operating point along this curve by  W = W*SHIFTOP(D,E,C)

The class index C refers to its position in the label list of the dataset  A used for training the classifier that yielded D. The relation to LABEL is LABEL = CLASSNAME(A,C); C = GETCLASSI(A,LABEL).

See also

datasets, mappings, testc, roc, plote, classname, getclassi,