# hessreg.m

From Spinach Documentation Wiki

RFO regularisation for Newton-Raphson Hessian and gradient pairs.

## Contents

## Syntax

[H,data]=hessreg(spin_system,H,g,data)

## Arguments

H - Hessian matrix to be regularised g - gradient computed at the same point as H data - diagnostic data structure

## Returns

H - regularised Hessian data - updated diagnostic data structure with data.count.rfo incremented by the number of RFO iterations taken

## See also

linesearch.m, fminnewton.m, lbfgs.m

*Version 2.2, authors: David Goodwin, Ilya Kuprov*