v4 csminwel.m: new version from Chris Sims
git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@654 ac1d8469-bf42-47a9-8791-bf33cf982152time-shift
parent
50ab0c0473
commit
244d8775e3
|
@ -1,274 +1,275 @@
|
|||
function [fh,xh,gh,H,itct,fcount,retcodeh] = csminwel(fcn,x0,H0,grad,crit,nit,varargin)
|
||||
%[fhat,xhat,ghat,Hhat,itct,fcount,retcodehat] = csminwel(fcn,x0,H0,grad,crit,nit,varargin)
|
||||
% fcn: string naming the objective function to be minimized
|
||||
% x0: initial value of the parameter vector
|
||||
% H0: initial value for the inverse Hessian. Must be positive definite.
|
||||
% grad: Either a string naming a function that calculates the gradient, or the null matrix.
|
||||
% If it's null, the program calculates a numerical gradient. In this case fcn must
|
||||
% be written so that it can take a matrix argument and produce a row vector of values.
|
||||
% crit: Convergence criterion. Iteration will cease when it proves impossible to improve the
|
||||
% function value by more than crit.
|
||||
% nit: Maximum number of iterations.
|
||||
% varargin: A list of optional length of additional parameters that get handed off to fcn each
|
||||
% time it is called.
|
||||
% Note that if the program ends abnormally, it is possible to retrieve the current x,
|
||||
% f, and H from the files g1.mat and H.mat that are written at each iteration and at each
|
||||
% hessian update, respectively. (When the routine hits certain kinds of difficulty, it
|
||||
% write g2.mat and g3.mat as well. If all were written at about the same time, any of them
|
||||
% may be a decent starting point. One can also start from the one with best function value.)
|
||||
global bayestopt_
|
||||
[nx,no]=size(x0);
|
||||
nx=max(nx,no);
|
||||
Verbose=1;
|
||||
NumGrad= isempty(grad);
|
||||
done=0;
|
||||
itct=0;
|
||||
fcount=0;
|
||||
snit=100;
|
||||
%tailstr = ')';
|
||||
%stailstr = [];
|
||||
% Lines below make the number of Pi's optional. This is inefficient, though, and precludes
|
||||
% use of the matlab compiler. Without them, we use feval and the number of Pi's must be
|
||||
% changed with the editor for each application. Places where this is required are marked
|
||||
% with ARGLIST comments
|
||||
%for i=nargin-6:-1:1
|
||||
% tailstr=[ ',P' num2str(i) tailstr];
|
||||
% stailstr=[' P' num2str(i) stailstr];
|
||||
%end
|
||||
f0 = feval(fcn,x0,varargin{:});
|
||||
%ARGLIST
|
||||
%f0 = feval(fcn,x0,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
% disp('first fcn in csminwel.m ----------------') % Jinill on 9/5/95
|
||||
if f0 > 1e50, disp('Bad initial parameter.'), return, end
|
||||
if NumGrad
|
||||
if length(grad)==0
|
||||
[g badg] = numgrad(fcn,x0, varargin{:});
|
||||
%ARGLIST
|
||||
%[g badg] = numgrad(fcn,x0,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
else
|
||||
badg=any(find(grad==0));
|
||||
g=grad;
|
||||
end
|
||||
%numgrad(fcn,x0,P1,P2,P3,P4);
|
||||
else
|
||||
[g badg] = feval(grad,x0,varargin{:});
|
||||
%ARGLIST
|
||||
%[g badg] = feval(grad,x0,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
end
|
||||
retcode3=101;
|
||||
x=x0;
|
||||
f=f0;
|
||||
H=H0;
|
||||
cliff=0;
|
||||
while ~done
|
||||
bayestopt_.penalty = f;
|
||||
g1=[]; g2=[]; g3=[];
|
||||
%addition fj. 7/6/94 for control
|
||||
disp('-----------------')
|
||||
disp('-----------------')
|
||||
%disp('f and x at the beginning of new iteration')
|
||||
disp(sprintf('f at the beginning of new iteration, %20.10f',f))
|
||||
%-----------Comment out this line if the x vector is long----------------
|
||||
% disp([sprintf('x = ') sprintf('%15.8g %15.8g %15.8g %15.8g\n',x(1:12))]);
|
||||
%-------------------------
|
||||
itct=itct+1;
|
||||
[f1 x1 fc retcode1] = csminit(fcn,x,f,g,badg,H,varargin{:});
|
||||
%ARGLIST
|
||||
%[f1 x1 fc retcode1] = csminit(fcn,x,f,g,badg,H,P1,P2,P3,P4,P5,P6,P7,...
|
||||
% P8,P9,P10,P11,P12,P13);
|
||||
% itct=itct+1;
|
||||
fcount = fcount+fc;
|
||||
% erased on 8/4/94
|
||||
% if (retcode == 1) | (abs(f1-f) < crit)
|
||||
% done=1;
|
||||
% end
|
||||
% if itct > nit
|
||||
% done = 1;
|
||||
% retcode = -retcode;
|
||||
% end
|
||||
if retcode1 ~= 1
|
||||
if retcode1==2 | retcode1==4
|
||||
wall1=1; badg1=1;
|
||||
else
|
||||
if NumGrad
|
||||
[g1 badg1] = numgrad(fcn, x1,varargin{:});
|
||||
%ARGLIST
|
||||
%[g1 badg1] = numgrad(fcn, x1,P1,P2,P3,P4,P5,P6,P7,P8,P9,...
|
||||
% P10,P11,P12,P13);
|
||||
else
|
||||
[g1 badg1] = feval(grad,x1,varargin{:});
|
||||
%ARGLIST
|
||||
%[g1 badg1] = feval(grad, x1,P1,P2,P3,P4,P5,P6,P7,P8,P9,...
|
||||
% P10,P11,P12,P13);
|
||||
end
|
||||
wall1=badg1;
|
||||
% g1
|
||||
save g1 g1 x1 f1 varargin;
|
||||
%ARGLIST
|
||||
%save g1 g1 x1 f1 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13;
|
||||
end
|
||||
if wall1 % & (~done) by Jinill
|
||||
% Bad gradient or back and forth on step length. Possibly at
|
||||
% cliff edge. Try perturbing search direction.
|
||||
%
|
||||
%fcliff=fh;xcliff=xh;
|
||||
Hcliff=H+diag(diag(H).*rand(nx,1));
|
||||
disp('Cliff. Perturbing search direction.')
|
||||
[f2 x2 fc retcode2] = csminit(fcn,x,f,g,badg,Hcliff,varargin{:});
|
||||
%ARGLIST
|
||||
%[f2 x2 fc retcode2] = csminit(fcn,x,f,g,badg,Hcliff,P1,P2,P3,P4,...
|
||||
% P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
fcount = fcount+fc; % put by Jinill
|
||||
if f2 < f
|
||||
if retcode2==2 | retcode2==4
|
||||
wall2=1; badg2=1;
|
||||
else
|
||||
if NumGrad
|
||||
[g2 badg2] = numgrad(fcn, x2,varargin{:});
|
||||
%ARGLIST
|
||||
%[g2 badg2] = numgrad(fcn, x2,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
else
|
||||
[g2 badg2] = feval(grad,x2,varargin{:});
|
||||
%ARGLIST
|
||||
%[g2 badg2] = feval(grad,x2,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
end
|
||||
wall2=badg2;
|
||||
% g2
|
||||
badg2
|
||||
save g2 g2 x2 f2 varargin
|
||||
%ARGLIST
|
||||
%save g2 g2 x2 f2 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13;
|
||||
end
|
||||
if wall2
|
||||
disp('Cliff again. Try traversing')
|
||||
if norm(x2-x1) < 1e-13
|
||||
f3=f; x3=x; badg3=1;retcode3=101;
|
||||
else
|
||||
gcliff=((f2-f1)/((norm(x2-x1))^2))*(x2-x1);
|
||||
[f3 x3 fc retcode3] = csminit(fcn,x,f,gcliff,0,eye(nx),varargin{:});
|
||||
%ARGLIST
|
||||
%[f3 x3 fc retcode3] = csminit(fcn,x,f,gcliff,0,eye(nx),P1,P2,P3,...
|
||||
% P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
fcount = fcount+fc; % put by Jinill
|
||||
if retcode3==2 | retcode3==4
|
||||
wall3=1; badg3=1;
|
||||
else
|
||||
if NumGrad
|
||||
[g3 badg3] = numgrad(fcn, x3,varargin{:});
|
||||
%ARGLIST
|
||||
%[g3 badg3] = numgrad(fcn, x3,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
else
|
||||
[g3 badg3] = feval(grad,x3,varargin{:});
|
||||
%ARGLIST
|
||||
%[g3 badg3] = feval(grad,x3,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
end
|
||||
wall3=badg3;
|
||||
% g3
|
||||
badg3
|
||||
save g3 g3 x3 f3 varargin;
|
||||
%ARGLIST
|
||||
%save g3 g3 x3 f3 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13;
|
||||
end
|
||||
end
|
||||
else
|
||||
f3=f; x3=x; badg3=1; retcode3=101;
|
||||
end
|
||||
else
|
||||
f3=f; x3=x; badg3=1;retcode3=101;
|
||||
end
|
||||
else
|
||||
% normal iteration, no walls, or else we're finished here.
|
||||
f2=f; f3=f; badg2=1; badg3=1; retcode2=101; retcode3=101;
|
||||
end
|
||||
else
|
||||
f2=f;f3=f;f1=f;retcode2=retcode1;retcode3=retcode1;
|
||||
end
|
||||
%how to pick gh and xh
|
||||
if f3<f & badg3==0
|
||||
ih=3
|
||||
fh=f3;xh=x3;gh=g3;badgh=badg3;retcodeh=retcode3;
|
||||
elseif f2<f & badg2==0
|
||||
ih=2
|
||||
fh=f2;xh=x2;gh=g2;badgh=badg2;retcodeh=retcode2;
|
||||
elseif f1<f & badg1==0
|
||||
ih=1
|
||||
fh=f1;xh=x1;gh=g1;badgh=badg1;retcodeh=retcode1;
|
||||
else
|
||||
[fh,ih] = min([f1,f2,f3]);
|
||||
disp(sprintf('ih = %d',ih))
|
||||
%eval(['xh=x' num2str(ih) ';'])
|
||||
switch ih
|
||||
case 1
|
||||
xh=x1;
|
||||
case 2
|
||||
xh=x2;
|
||||
case 3
|
||||
xh=x3;
|
||||
end %case
|
||||
%eval(['gh=g' num2str(ih) ';'])
|
||||
%eval(['retcodeh=retcode' num2str(ih) ';'])
|
||||
retcodei=[retcode1,retcode2,retcode3];
|
||||
retcodeh=retcodei(ih);
|
||||
if exist('gh')
|
||||
nogh=isempty(gh);
|
||||
else
|
||||
nogh=1;
|
||||
end
|
||||
if nogh
|
||||
if NumGrad
|
||||
[gh badgh] = numgrad(fcn,xh,varargin{:});
|
||||
else
|
||||
[gh badgh] = feval(grad, xh,varargin{:});
|
||||
end
|
||||
end
|
||||
badgh=1;
|
||||
end
|
||||
%end of picking
|
||||
%ih
|
||||
%fh
|
||||
%xh
|
||||
%gh
|
||||
%badgh
|
||||
stuck = (abs(fh-f) < crit);
|
||||
if (~badg)&(~badgh)&(~stuck)
|
||||
H = bfgsi(H,gh-g,xh-x);
|
||||
end
|
||||
if Verbose
|
||||
disp('----')
|
||||
disp(sprintf('Improvement on iteration %d = %18.9f',itct,f-fh))
|
||||
end
|
||||
if Verbose
|
||||
if itct > nit
|
||||
disp('iteration count termination')
|
||||
done = 1;
|
||||
elseif stuck
|
||||
disp('improvement < crit termination')
|
||||
done = 1;
|
||||
end
|
||||
rc=retcodeh;
|
||||
if rc == 1
|
||||
disp('zero gradient')
|
||||
elseif rc == 6
|
||||
disp('smallest step still improving too slow, reversed gradient')
|
||||
elseif rc == 5
|
||||
disp('largest step still improving too fast')
|
||||
elseif (rc == 4) | (rc==2)
|
||||
disp('back and forth on step length never finished')
|
||||
elseif rc == 3
|
||||
disp('smallest step still improving too slow')
|
||||
elseif rc == 7
|
||||
disp('warning: possible inaccuracy in H matrix')
|
||||
end
|
||||
end
|
||||
f=fh;
|
||||
x=xh;
|
||||
g=gh;
|
||||
badg=badgh;
|
||||
end
|
||||
% what about making an m-file of 10 lines including numgrad.m
|
||||
% since it appears three times in csminwel.m
|
||||
function [fh,xh,gh,H,itct,fcount,retcodeh] = csminwel(fcn,x0,H0,grad,crit,nit,varargin)
|
||||
%[fhat,xhat,ghat,Hhat,itct,fcount,retcodehat] = csminwel(fcn,x0,H0,grad,crit,nit,varargin)
|
||||
% fcn: string naming the objective function to be minimized
|
||||
% x0: initial value of the parameter vector
|
||||
% H0: initial value for the inverse Hessian. Must be positive definite.
|
||||
% grad: Either a string naming a function that calculates the gradient, or the null matrix.
|
||||
% If it's null, the program calculates a numerical gradient. In this case fcn must
|
||||
% be written so that it can take a matrix argument and produce a row vector of values.
|
||||
% crit: Convergence criterion. Iteration will cease when it proves impossible to improve the
|
||||
% function value by more than crit.
|
||||
% nit: Maximum number of iterations.
|
||||
% varargin: A list of optional length of additional parameters that get handed off to fcn each
|
||||
% time it is called.
|
||||
% Note that if the program ends abnormally, it is possible to retrieve the current x,
|
||||
% f, and H from the files g1.mat and H.mat that are written at each iteration and at each
|
||||
% hessian update, respectively. (When the routine hits certain kinds of difficulty, it
|
||||
% write g2.mat and g3.mat as well. If all were written at about the same time, any of them
|
||||
% may be a decent starting point. One can also start from the one with best function value.)
|
||||
global bayestopt_
|
||||
[nx,no]=size(x0);
|
||||
nx=max(nx,no);
|
||||
Verbose=1;
|
||||
NumGrad= isempty(grad);
|
||||
done=0;
|
||||
itct=0;
|
||||
fcount=0;
|
||||
snit=100;
|
||||
%tailstr = ')';
|
||||
%stailstr = [];
|
||||
% Lines below make the number of Pi's optional. This is inefficient, though, and precludes
|
||||
% use of the matlab compiler. Without them, we use feval and the number of Pi's must be
|
||||
% changed with the editor for each application. Places where this is required are marked
|
||||
% with ARGLIST comments
|
||||
%for i=nargin-6:-1:1
|
||||
% tailstr=[ ',P' num2str(i) tailstr];
|
||||
% stailstr=[' P' num2str(i) stailstr];
|
||||
%end
|
||||
f0 = feval(fcn,x0,varargin{:});
|
||||
%ARGLIST
|
||||
%f0 = feval(fcn,x0,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
% disp('first fcn in csminwel.m ----------------') % Jinill on 9/5/95
|
||||
if f0 > 1e50, disp('Bad initial parameter.'), return, end
|
||||
if NumGrad
|
||||
if length(grad)==0
|
||||
[g badg] = numgrad(fcn,x0, varargin{:});
|
||||
%ARGLIST
|
||||
%[g badg] = numgrad(fcn,x0,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
else
|
||||
badg=any(find(grad==0));
|
||||
g=grad;
|
||||
end
|
||||
%numgrad(fcn,x0,P1,P2,P3,P4);
|
||||
else
|
||||
[g badg] = feval(grad,x0,varargin{:});
|
||||
%ARGLIST
|
||||
%[g badg] = feval(grad,x0,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
end
|
||||
retcode3=101;
|
||||
x=x0;
|
||||
f=f0;
|
||||
H=H0;
|
||||
cliff=0;
|
||||
while ~done
|
||||
bayestopt_.penalty = f;
|
||||
g1=[]; g2=[]; g3=[];
|
||||
%addition fj. 7/6/94 for control
|
||||
disp('-----------------')
|
||||
disp('-----------------')
|
||||
%disp('f and x at the beginning of new iteration')
|
||||
disp(sprintf('f at the beginning of new iteration, %20.10f',f))
|
||||
%-----------Comment out this line if the x vector is long----------------
|
||||
% disp([sprintf('x = ') sprintf('%15.8g %15.8g %15.8g %15.8g\n',x)]);
|
||||
%-------------------------
|
||||
itct=itct+1;
|
||||
[f1 x1 fc retcode1] = csminit(fcn,x,f,g,badg,H,varargin{:});
|
||||
%ARGLIST
|
||||
%[f1 x1 fc retcode1] = csminit(fcn,x,f,g,badg,H,P1,P2,P3,P4,P5,P6,P7,...
|
||||
% P8,P9,P10,P11,P12,P13);
|
||||
% itct=itct+1;
|
||||
fcount = fcount+fc;
|
||||
% erased on 8/4/94
|
||||
% if (retcode == 1) | (abs(f1-f) < crit)
|
||||
% done=1;
|
||||
% end
|
||||
% if itct > nit
|
||||
% done = 1;
|
||||
% retcode = -retcode;
|
||||
% end
|
||||
if retcode1 ~= 1
|
||||
if retcode1==2 | retcode1==4
|
||||
wall1=1; badg1=1;
|
||||
else
|
||||
if NumGrad
|
||||
[g1 badg1] = numgrad(fcn, x1,varargin{:});
|
||||
%ARGLIST
|
||||
%[g1 badg1] = numgrad(fcn, x1,P1,P2,P3,P4,P5,P6,P7,P8,P9,...
|
||||
% P10,P11,P12,P13);
|
||||
else
|
||||
[g1 badg1] = feval(grad,x1,varargin{:});
|
||||
%ARGLIST
|
||||
%[g1 badg1] = feval(grad, x1,P1,P2,P3,P4,P5,P6,P7,P8,P9,...
|
||||
% P10,P11,P12,P13);
|
||||
end
|
||||
wall1=badg1;
|
||||
% g1
|
||||
save g1 g1 x1 f1 varargin;
|
||||
%ARGLIST
|
||||
%save g1 g1 x1 f1 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13;
|
||||
end
|
||||
if wall1 % & (~done) by Jinill
|
||||
% Bad gradient or back and forth on step length. Possibly at
|
||||
% cliff edge. Try perturbing search direction.
|
||||
%
|
||||
%fcliff=fh;xcliff=xh;
|
||||
Hcliff=H+diag(diag(H).*rand(nx,1));
|
||||
disp('Cliff. Perturbing search direction.')
|
||||
[f2 x2 fc retcode2] = csminit(fcn,x,f,g,badg,Hcliff,varargin{:});
|
||||
%ARGLIST
|
||||
%[f2 x2 fc retcode2] = csminit(fcn,x,f,g,badg,Hcliff,P1,P2,P3,P4,...
|
||||
% P5,P6,P7,P8,P9,P10,P11,P12,P13);
|
||||
fcount = fcount+fc; % put by Jinill
|
||||
if f2 < f
|
||||
if retcode2==2 | retcode2==4
|
||||
wall2=1; badg2=1;
|
||||
else
|
||||
if NumGrad
|
||||
[g2 badg2] = numgrad(fcn, x2,varargin{:});
|
||||
%ARGLIST
|
||||
%[g2 badg2] = numgrad(fcn, x2,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
else
|
||||
[g2 badg2] = feval(grad,x2,varargin{:});
|
||||
%ARGLIST
|
||||
%[g2 badg2] = feval(grad,x2,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
end
|
||||
wall2=badg2;
|
||||
% g2
|
||||
badg2
|
||||
save g2 g2 x2 f2 varargin
|
||||
%ARGLIST
|
||||
%save g2 g2 x2 f2 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13;
|
||||
end
|
||||
if wall2
|
||||
disp('Cliff again. Try traversing')
|
||||
if norm(x2-x1) < 1e-13
|
||||
f3=f; x3=x; badg3=1;retcode3=101;
|
||||
else
|
||||
gcliff=((f2-f1)/((norm(x2-x1))^2))*(x2-x1);
|
||||
if(size(x0,2)>1), gcliff=gcliff', end
|
||||
[f3 x3 fc retcode3] = csminit(fcn,x,f,gcliff,0,eye(nx),varargin{:});
|
||||
%ARGLIST
|
||||
%[f3 x3 fc retcode3] = csminit(fcn,x,f,gcliff,0,eye(nx),P1,P2,P3,...
|
||||
% P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
fcount = fcount+fc; % put by Jinill
|
||||
if retcode3==2 | retcode3==4
|
||||
wall3=1; badg3=1;
|
||||
else
|
||||
if NumGrad
|
||||
[g3 badg3] = numgrad(fcn, x3,varargin{:});
|
||||
%ARGLIST
|
||||
%[g3 badg3] = numgrad(fcn, x3,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
else
|
||||
[g3 badg3] = feval(grad,x3,varargin{:});
|
||||
%ARGLIST
|
||||
%[g3 badg3] = feval(grad,x3,P1,P2,P3,P4,P5,P6,P7,P8,...
|
||||
% P9,P10,P11,P12,P13);
|
||||
end
|
||||
wall3=badg3;
|
||||
% g3
|
||||
badg3
|
||||
save g3 g3 x3 f3 varargin;
|
||||
%ARGLIST
|
||||
%save g3 g3 x3 f3 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13;
|
||||
end
|
||||
end
|
||||
else
|
||||
f3=f; x3=x; badg3=1; retcode3=101;
|
||||
end
|
||||
else
|
||||
f3=f; x3=x; badg3=1;retcode3=101;
|
||||
end
|
||||
else
|
||||
% normal iteration, no walls, or else we're finished here.
|
||||
f2=f; f3=f; badg2=1; badg3=1; retcode2=101; retcode3=101;
|
||||
end
|
||||
else
|
||||
f2=f;f3=f;f1=f;retcode2=retcode1;retcode3=retcode1;
|
||||
end
|
||||
%how to pick gh and xh
|
||||
if f3 < f - crit & badg3==0
|
||||
ih=3
|
||||
fh=f3;xh=x3;gh=g3;badgh=badg3;retcodeh=retcode3;
|
||||
elseif f2 < f - crit & badg2==0
|
||||
ih=2
|
||||
fh=f2;xh=x2;gh=g2;badgh=badg2;retcodeh=retcode2;
|
||||
elseif f1 < f - crit & badg1==0
|
||||
ih=1
|
||||
fh=f1;xh=x1;gh=g1;badgh=badg1;retcodeh=retcode1;
|
||||
else
|
||||
[fh,ih] = min([f1,f2,f3]);
|
||||
disp(sprintf('ih = %d',ih))
|
||||
%eval(['xh=x' num2str(ih) ';'])
|
||||
switch ih
|
||||
case 1
|
||||
xh=x1;
|
||||
case 2
|
||||
xh=x2;
|
||||
case 3
|
||||
xh=x3;
|
||||
end %case
|
||||
%eval(['gh=g' num2str(ih) ';'])
|
||||
%eval(['retcodeh=retcode' num2str(ih) ';'])
|
||||
retcodei=[retcode1,retcode2,retcode3];
|
||||
retcodeh=retcodei(ih);
|
||||
if exist('gh')
|
||||
nogh=isempty(gh);
|
||||
else
|
||||
nogh=1;
|
||||
end
|
||||
if nogh
|
||||
if NumGrad
|
||||
[gh badgh] = numgrad(fcn,xh,varargin{:});
|
||||
else
|
||||
[gh badgh] = feval(grad, xh,varargin{:});
|
||||
end
|
||||
end
|
||||
badgh=1;
|
||||
end
|
||||
%end of picking
|
||||
%ih
|
||||
%fh
|
||||
%xh
|
||||
%gh
|
||||
%badgh
|
||||
stuck = (abs(fh-f) < crit);
|
||||
if (~badg)&(~badgh)&(~stuck)
|
||||
H = bfgsi(H,gh-g,xh-x);
|
||||
end
|
||||
if Verbose
|
||||
disp('----')
|
||||
disp(sprintf('Improvement on iteration %d = %18.9f',itct,f-fh))
|
||||
end
|
||||
% if Verbose
|
||||
if itct > nit
|
||||
disp('iteration count termination')
|
||||
done = 1;
|
||||
elseif stuck
|
||||
disp('improvement < crit termination')
|
||||
done = 1;
|
||||
end
|
||||
rc=retcodeh;
|
||||
if rc == 1
|
||||
disp('zero gradient')
|
||||
elseif rc == 6
|
||||
disp('smallest step still improving too slow, reversed gradient')
|
||||
elseif rc == 5
|
||||
disp('largest step still improving too fast')
|
||||
elseif (rc == 4) | (rc==2)
|
||||
disp('back and forth on step length never finished')
|
||||
elseif rc == 3
|
||||
disp('smallest step still improving too slow')
|
||||
elseif rc == 7
|
||||
disp('warning: possible inaccuracy in H matrix')
|
||||
end
|
||||
% end
|
||||
f=fh;
|
||||
x=xh;
|
||||
g=gh;
|
||||
badg=badgh;
|
||||
end
|
||||
% what about making an m-file of 10 lines including numgrad.m
|
||||
% since it appears three times in csminwel.m
|
||||
|
|
Loading…
Reference in New Issue