METHODS FOR NON-LINEAR LEAST SQUARES PROBLEMS
72.DESCENT METHODS Definition 2.6. Descent direction. h is a descent direction for Fat x if h>F0(x) <0: If no such hexists, then F0(x)=0, showing that in this case xis stationary. Otherwise, we have to choose fi, ie how far we should go from x in the direction given by hd, so that we get a decrease in the value of the objective function.
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