43   if (nrm >= neP->delta) {  in SNESTRDC_KSPConverged_Private()
44 …fo(snes, "Ending linear iteration early, delta=%g, length=%g\n", (double)neP->delta, (double)nrm));  in SNESTRDC_KSPConverged_Private()
69   if (neP->delta < xnorm * neP->deltatol) {  in SNESTRDC_Converged_Private()
70 …snes, "Diverged due to too small a trust region %g<%g*%g\n", (double)neP->delta, (double)xnorm, (d…  in SNESTRDC_Converged_Private()
302 …PetscReal                   rho, fnorm, gnorm, xnorm = 0, delta, ynorm, temp_xnorm, temp_ynorm; /*…  in SNESSolve_NEWTONTRDC()  local
355 …delta      = xnorm ? neP->delta0 * xnorm : neP->delta0; /* initial trust region size scaled by xno…  in SNESSolve_NEWTONTRDC()
357   neP->delta = delta;  in SNESSolve_NEWTONTRDC()
395         delta = neP->delta0 * xnorm;  in SNESSolve_NEWTONTRDC()
397         delta = neP->delta * xnorm;  in SNESSolve_NEWTONTRDC()
410       if (ynnorm <= delta) { /* see if the Newton solution is within the trust region */  in SNESSolve_NEWTONTRDC()
421         auk = PetscMin(delta / gfnorm, auk);  in SNESSolve_NEWTONTRDC()
425 …    if (ycnorm >= delta) {                      /* see if the Cauchy solution meets the criteria */  in SNESSolve_NEWTONTRDC()
427 …es, "DL evaluated. delta: %8.4e, ynnorm: %8.4e, ycnorm: %8.4e\n", (double)delta, (double)ynnorm, (…  in SNESSolve_NEWTONTRDC()
435           c2      = PetscSqr(c2) - PetscSqr(delta);  in SNESSolve_NEWTONTRDC()
446         auk = delta / ynnorm;  in SNESSolve_NEWTONTRDC()
490         delta *= neP->t1; /* shrink the region */  in SNESSolve_NEWTONTRDC()
492 …    delta = PetscMin(neP->t2 * delta, deltaM); /* expand the region, but not greater than deltaM */  in SNESSolve_NEWTONTRDC()
495       neP->delta = delta;  in SNESSolve_NEWTONTRDC()
499           neP->delta = delta / xnorm;  in SNESSolve_NEWTONTRDC()
516           neP->delta = delta / xnorm;  in SNESSolve_NEWTONTRDC()
691   neP->delta                 = 0.0;  in SNESCreate_NEWTONTRDC()