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Dóra Kocsis
dynare
Commits
4ce4242d
Commit
4ce4242d
authored
Sep 21, 2012
by
Stéphane Adjemian
Browse files
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Added new numgrad* routines (h specific to each direction).
parent
3589c04f
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3 changed files
matlab/numgrad2_.m
+60
-0
60 additions, 0 deletions
matlab/numgrad2_.m
matlab/numgrad3_.m
+72
-0
72 additions, 0 deletions
matlab/numgrad3_.m
matlab/numgrad5_.m
+91
-0
91 additions, 0 deletions
matlab/numgrad5_.m
with
223 additions
and
0 deletions
matlab/numgrad2_.m
0 → 100644
+
60
−
0
View file @
4ce4242d
function
[
g
,
badg
]
=
numgrad2_
(
fcn
,
f0
,
x
,
epsilon
,
scale
,
varargin
)
% function [g badg] = numgrad2(fcn,xvarargin)
% Original file downloaded from:
% http://sims.princeton.edu/yftp/optimize/mfiles/numgrad.m
% Copyright (C) 1993-2007 Christopher Sims
% Copyright (C) 2012 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
fh
=
NaN
;
delta
=
epsilon
*
max
(
abs
(
x
));
n
=
length
(
x
);
g
=
zeros
(
n
,
1
);
badg
=
0
;
goog
=
1
;
g0
=
0
;
for
i
=
1
:
n
xiold
=
x
(
i
);
h
=
step_length_correction
(
xiold
,
scale
,
i
)
*
delta
;
x
(
i
)
=
xiold
+
h
;
[
fh
,
junk1
,
junk2
,
cost_flag
]
=
feval
(
fcn
,
x
,
varargin
{:});
if
cost_flag
g0
=
(
fh
-
f0
)/
h
;
else
x
(
i
)
=
xiold
-
h
;
[
fh
,
junk1
,
junk2
,
cost_flag
]
=
feval
(
fcn
,
x
,
varargin
{:});
if
cost_flag
g0
=
(
f0
-
fh
)/
h
;
else
goog
=
0
;
end
end
if
goog
&&
abs
(
g0
)
<
1e15
g
(
i
)
=
g0
;
else
disp
(
'bad gradient ------------------------'
)
% fprintf('Gradient w.r.t. %3d: %10g\n',i,g0)
g
(
i
)
=
0
;
badg
=
1
;
end
x
(
i
)
=
xiold
;
end
\ No newline at end of file
This diff is collapsed.
Click to expand it.
matlab/numgrad3_.m
0 → 100644
+
72
−
0
View file @
4ce4242d
function
[
g
,
badg
,
f0
,
f1
,
f2
]
=
numgrad3_
(
fcn
,
f0
,
x
,
epsilon
,
scale
,
varargin
)
% Computes the gradient of the objective function fcn using a three points
% formula if possible.
%
% Adapted from Sims' numgrad routine.
%
% See section 25.3.4 in Abramovitz and Stegun (1972, Tenth Printing, December) Handbook of Mathematical Functions.
% http://www.math.sfu.ca/~cbm/aands/
% Original file downloaded from:
% http://sims.princeton.edu/yftp/optimize/mfiles/numgrad.m
% Copyright (C) 1993-2007 Christopher Sims
% Copyright (C) 2008-2012 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
f1
=
NaN
;
f2
=
NaN
;
delta
=
epsilon
;
n
=
length
(
x
);
g
=
zeros
(
n
,
1
);
badg
=
0
;
goog
=
1
;
zgrad
=
1
;
for
i
=
1
:
n
xiold
=
x
(
i
);
h
=
step_length_correction
(
xiold
,
scale
,
i
)
*
delta
;
x
(
i
)
=
xiold
+
h
;
[
f1
,
junk1
,
junk2
,
cost_flag1
]
=
feval
(
fcn
,
x
,
varargin
{:});
x
(
i
)
=
xiold
-
h
;
[
f2
,
junk1
,
junk2
,
cost_flag2
]
=
feval
(
fcn
,
x
,
varargin
{:});
if
cost_flag1
&&
cost_flag2
g0
=
(
f1
-
f2
)
/
(
2
*
h
);
if
zgrad
&&
f1
>
f0
&&
f2
>
f0
% Note that this condition is consistent with a minimization problem!
g0
=
0
;
end
else
if
cost_flag1
g0
=
(
f1
-
f0
)/
h
;
elseif
cost_flag2
g0
=
(
f0
-
f2
)/
h
;
else
goog
=
0
;
end
end
if
goog
&&
abs
(
g0
)
<
1e15
g
(
i
)
=
g0
;
else
disp
(
'bad gradient ------------------------'
)
g
(
i
)
=
0
;
badg
=
1
;
end
x
(
i
)
=
xiold
;
end
\ No newline at end of file
This diff is collapsed.
Click to expand it.
matlab/numgrad5_.m
0 → 100644
+
91
−
0
View file @
4ce4242d
function
[
g
,
badg
,
f0
,
f1
,
f2
,
f3
,
f4
]
=
numgrad5_
(
fcn
,
f0
,
x
,
epsilon
,
scale
,
varargin
)
% Computes the gradient of the objective function fcn using a five points
% formula if possible.
%
% Adapted from Sims' numgrad.m routine.
%
% See section 25.3.6 Abramovitz and Stegun (1972, Tenth Printing, December) Handbook of Mathematical Functions.
% http://www.math.sfu.ca/~cbm/aands/
%
% TODO Try Four points formula when cost_flag3=0 or cost_flag4=0.
% Original file downloaded from:
% http://sims.princeton.edu/yftp/optimize/mfiles/numgrad.m
% Copyright (C) 1993-2007 Christopher Sims
% Copyright (C) 2008-2012 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
f1
=
NaN
;
f2
=
NaN
;
f3
=
NaN
;
f4
=
NaN
;
delta
=
epsilon
;
n
=
length
(
x
);
tvec
=
delta
*
eye
(
n
);
g
=
zeros
(
n
,
1
);
badg
=
0
;
goog
=
1
;
zgrad
=
1
;
for
i
=
1
:
n
xiold
=
x
(
i
);
h
=
step_length_correction
(
xiold
,
scale
,
i
)
*
delta
;
x
(
i
)
=
xiold
+
h
;
[
f1
,
junk1
,
junk2
,
cost_flag1
]
=
feval
(
fcn
,
x
,
varargin
{:});
x
(
i
)
=
xiold
-
h
;
[
f2
,
junk1
,
junk2
,
cost_flag2
]
=
feval
(
fcn
,
x
,
varargin
{:});
if
~
cost_flag1
||
~
cost_flag2
cost_flag3
=
0
;
cost_flag4
=
0
;
disp
(
'numgrad:: I cannot use the five points formula!!'
)
else
x
(
i
)
=
xiold
+
2
*
h
;
[
f3
,
junk1
,
junk2
,
cost_flag3
]
=
feval
(
fcn
,
x
,
varargin
{:});
x
(
i
)
=
xiold
-
2
*
h
;
[
f4
,
junk1
,
junk2
,
cost_flag4
]
=
feval
(
fcn
,
x
,
varargin
{:});
end
if
cost_flag1
&&
cost_flag2
&&
cost_flag3
&&
cost_flag4
% Five Points formula
g0
=
(
8
*
(
f1
-
f2
)
+
f4
-
f3
)
/
(
12
*
h
);
if
zgrad
&&
f0
<
f1
&&
f0
<
f2
&&
f1
<
f3
&&
f2
<
f4
% Note that this condition is consistent with a minimization problem!
g0
=
0
;
end
elseif
~
cost_flag3
||
~
cost_flag4
if
cost_flag1
&&
cost_flag2
% Three points formula
g0
=
(
f1
-
f2
)/(
2
*
h
);
else
if
cost_flag1
% Two points formula
g0
=
(
f1
-
f0
)/
h
;
elseif
cost_flag2
% Two points formula
g0
=
(
f0
-
f2
)/
h
;
else
% Bad gradient!
goog
=
0
;
end
end
end
if
goog
&&
abs
(
g0
)
<
1e15
g
(
i
)
=
g0
;
else
disp
(
'bad gradient ------------------------'
)
g
(
i
)
=
0
;
badg
=
1
;
end
x
(
i
)
=
xiold
;
end
\ No newline at end of file
This diff is collapsed.
Click to expand it.
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