.TH "sc::HessianUpdate" 3 "Sun Oct 4 2020" "Version 2.3.1" "MPQC" \" -*- nroff -*-
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.SH NAME
sc::HessianUpdate \- The \fBHessianUpdate\fP abstract class is used to specify a hessian update scheme\&.  

.SH SYNOPSIS
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.PP
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\fC#include <update\&.h>\fP
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Inherits \fBsc::SavableState\fP\&.
.PP
Inherited by \fBsc::DFPUpdate\fP, and \fBsc::PowellUpdate\fP\&.
.SS "Public Member Functions"

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.RI "\fBHessianUpdate\fP (\fBStateIn\fP &)"
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.RI "\fBHessianUpdate\fP (const \fBRef\fP< \fBKeyVal\fP > &)"
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.RI "void \fBsave_data_state\fP (\fBStateOut\fP &)"
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.RI "Save the base classes (with save_data_state) and the members in the same order that the \fBStateIn\fP CTOR initializes them\&. "
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.RI "virtual void \fBupdate\fP (const \fBRefSymmSCMatrix\fP &hessian, const \fBRef\fP< \fBFunction\fP > &, const \fBRefSCVector\fP &xnew, const \fBRefSCVector\fP &gnew)=0"
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.RI "virtual void \fBset_inverse\fP ()"
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.RI "virtual void \fBapply_transform\fP (const \fBRef\fP< \fBNonlinearTransform\fP > &)"
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.SS "Protected Attributes"

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.RI "int \fBinverse_hessian_\fP"
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.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP 
The \fBHessianUpdate\fP abstract class is used to specify a hessian update scheme\&. 

It is used, for example, by \fBQNewtonOpt\fP objects\&. Based on the value of inverse_hessian_ x and g may be reversed (see Schlegel, Ab initio Methods in Quantum Chemistry I, 1987, p 10)\&. 
.SH "Member Function Documentation"
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.SS "void sc::HessianUpdate::save_data_state (\fBStateOut\fP &)\fC [virtual]\fP"

.PP
Save the base classes (with save_data_state) and the members in the same order that the \fBStateIn\fP CTOR initializes them\&. This must be implemented by the derived class if the class has data\&. 
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Reimplemented from \fBsc::SavableState\fP\&.
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Reimplemented in \fBsc::PowellUpdate\fP, \fBsc::BFGSUpdate\fP, and \fBsc::DFPUpdate\fP\&.

.SH "Author"
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Generated automatically by Doxygen for MPQC from the source code\&.