One-dimensional minimization [abstract base]. More...
#include <min.h>
Public Member Functions | |
virtual int | print_iter (double x, double y, int iter, double value=0.0, double limit=0.0, std::string comment="") |
Print out iteration information. More... | |
virtual int | min (double &x, double &fmin, func_t &func)=0 |
Calculate the minimum min of func w.r.t 'x'. More... | |
virtual int | min_bkt (double &x2, double x1, double x3, double &fmin, func_t &func)=0 |
Calculate the minimum min of func with x2 bracketed between x1 and x3. More... | |
virtual int | min_de (double &x, double &fmin, func_t &func, dfunc_t &df)=0 |
Calculate the minimum min of func with derivative dfunc w.r.t 'x'. More... | |
virtual int | bracket (double &ax, double &bx, double &cx, double &fa, double &fb, double &fc, func_t &func) |
Given interval (ax,bx) , attempt to bracket a minimum for function func . More... | |
virtual const char * | type () |
Return string denoting type ("min") | |
Public Attributes | |
int | verbose |
Output control. | |
int | ntrial |
Maximum number of iterations. | |
double | tol_rel |
The tolerance for the minimum function value. | |
double | tol_abs |
The tolerance for the location of the minimum. | |
int | last_ntrial |
The number of iterations used in the most recent minimization. | |
int | bracket_iter |
The number of iterations for automatically bracketing a minimum (default 20) | |
bool | err_nonconv |
If true, call the error handler if the routine does not "converge". | |
|
inlinevirtual |
Upon success, fa=func(ax)
, fb=func(bx)
, and fc=func(cx)
with fb<fa
, fb<fc
and ax<bx<cx
. The initial values of cx
, fa
, fb
, and fc
are all ignored.
The number of iterations is controlled by bracket_iter.
ax
, bx
, and the midpoint (ax+bx)/2
.
|
pure virtual |
If this is not overloaded, it attempts to bracket the minimum using bracket() and then calls min_bkt() with the newly bracketed minimum.
Implemented in o2scl::min_de_base< func_t, dfunc_t >, o2scl::min_bkt_base< func_t, dfunc_t >, and o2scl::min_bkt_base< func_t >.
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pure virtual |
If this is not overloaded, it ignores the bracket and calls min().
Implemented in o2scl::min_quad_golden< func_t >, o2scl::min_brent_gsl< func_t >, o2scl::min_de_base< func_t, dfunc_t >, o2scl::min_bkt_base< func_t, dfunc_t >, o2scl::min_bkt_base< func_t >, o2scl::min_cern< func_t >, and o2scl::min_brent_boost< func_t >.
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pure virtual |
If this is not overloaded, it attempts to bracket the minimum using bracket() and then calls min_bkt_de() with the newly bracketed minimum.
Implemented in o2scl::min_de_base< func_t, dfunc_t >, o2scl::min_bkt_base< func_t, dfunc_t >, and o2scl::min_bkt_base< func_t >.
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inlinevirtual |
Depending on the value of the variable verbose, this prints out the iteration information. If verbose=0, then no information is printed, while if verbose>1, then after each iteration, the present values of x and y are output to std::cout along with the iteration number. If verbose>=2 then each iteration waits for a character.
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