private double handleCase4 ( ) { if ( bracket ) { return SearchInterpolate . cubic2 ( fp , gp , stp , fy , gy , sty ) ; } else if ( stp > stx ) { return stmax ; // see comment in case 3 about stmax and stmin } else { return stmin ; } }
Lower function value . On the same side of the dip because the gradients have the same sign . The magnitude of the derivative did not decrease .