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  /external/eigen/unsupported/Eigen/src/NonLinearOptimization/
dogleg.h 19 Scalar sgnorm; local
62 sgnorm = 0.;
80 sgnorm = gnorm / temp / temp;
84 if (sgnorm >= delta)
91 temp = bnorm / gnorm * (bnorm / qnorm) * (sgnorm / delta);
92 temp = temp - delta / qnorm * abs2(sgnorm / delta) + sqrt(abs2(temp - delta / qnorm) + (1.-abs2(delta / qnorm)) * (1.-abs2(sgnorm / delta)));
93 alpha = delta / qnorm * (1. - abs2(sgnorm / delta)) / temp;
98 temp = (1.-alpha) * (std::min)(sgnorm,delta);

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