function?[X?fX?i]?=?fmincg（f?X?options?P1?P2?P3?P4?P5）
%?最小值搜索
if?exist（‘options‘?‘var‘）?&&?~isempty（options）?&&?isfield（options?‘MaxIter‘）
????length?=?options.MaxIter;
else
????length?=?100;
end


RHO?=?0.01;????????????????????????????%?a?bunch?of?constants?for?line?searches
SIG?=?0.5;???????%?RHO?and?SIG?are?the?constants?in?the?Wolfe-Powell?conditions
INT?=?0.1;????%?don‘t?reevaluate?within?0.1?of?the?limit?of?the?current?bracket
EXT?=?3.0;????????????????????%?extrapolate?maximum?3?times?the?current?bracket
MAX?=?20;?????????????????????????%?max?20?function?evaluations?per?line?search
RATIO?=?100;??????????????????????????????????????%?maximum?allowed?slope?ratio

argstr?=?[‘feval（f?X‘];??????????????????????%?compose?string?used?to?call?function
for?i?=?1:（nargin?-?3）
??argstr?=?[argstr?‘P‘?int2str（i）];
end
argstr?=?[argstr?‘）‘];

if?max（size（length））?==?2?red=length（2）;?length=length（1）;?else?red=1;?end
S=[‘Iteration?‘];

i?=?0;????????????????????????????????????????????%?zero?the?run?length?counter
ls_failed?=?0;?????????????????????????????%?no?previous?line?search?has?failed
fX?=?[];
[f1?df1]?=?eval（argstr）;??????????????????????%?get?function?value?and?gradient
i?=?i?+?（length<0）;????????????????????????????????????????????%?count?epochs?!
s?=?-df1;????????????????????????????????????????%?search?direction?is?steepest
d1?=?-s‘*s;?????????????????????????????????????????????????%?this?is?the?slope
z1?=?red/（1-d1）;??????????????????????????????????%?initial?step?is?red/（|s|+1）

while?i???i?=?i?+?（length>0）;??????????????????????????????????????%?count?iterations?!

??X0?=?X;?f0?=?f1;?df0?=?df1;???????????????????%?make?a?copy?of?current?values
??X?=?X?+?z1*s;?????????????????????????????????????????????%?begin?line?search
??[f2?df2]?=?eval（argstr）;
??i?=?i?+?（length<0）;??????????????????????????????????????????%?count?epochs?!
??d2?=?df2‘*s;
??f3?=?f1;?d3?=?d1;?z3?=?-z1;?????????????%?initialize?point?3?equal?to?point?1
??if?length>0?M?=?MAX;?else?M?=?min（MAX?-length-i）;?end
??success?=?0;?limit?=?-1;?????????????????????%?initialize?quanteties
??while?1
????while?（（f2?>?f1+z1*RHO*d1）?|?（d2?>?-SIG*d1））?&?（M?>?0）?
??????limit?=?z1;?????????????????????????????????????????%?tighten?the?bracket
??????if?f2?>?f1
????????z2?=?z3?-?（0.5*d3*z3*z3）/（d3*z3+f2-f3）;?????????????????%?quadratic?fit
??????else
????????A?=?6*（f2-f3）/z3+3*（d2+d3）;?????????????????????????????????%?cubic?fit
????????B?=?3*（f3-f2）-z3*（d3+2*d2）;
????????z2?=?（sqrt（B*B-A*d2*z3*z3）-B）/A;???????%?numerical?error?possible?-?ok!
??????end
??????if?isnan（z2）?|?isinf（z2）
????????z2?=?z3/2;??????????????????%?if?we?had?a?numerical?problem?then?bisect
??????end
??????z2?=?max（min（z2?INT*z3）（1-INT）*z3）;??%?don‘t?accept?too?close?to?limits
??????z1?=?z1?+?z2;???????????????????????????????????????????%?update?the?step
??????X?=?X?+?z2*s;
??????[f2?df2]?=?eval（argstr）;
??????M?=?M?-?1;?i?=

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
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?????文件?????1163264??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\基于BP神經網絡車牌照識別和分類方法的研究.doc
?????文件?????2011136??2020-03-29?11:52??基于matlab?BP網絡車牌照識別\基于MATLAB的車牌識別系統的設計與實現.ppt
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?????文件???????84248??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\介紹\2.jpg
?????文件?????2722454??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\介紹\3.bmp
?????文件???????93815??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\介紹\4.jpg
?????文件?????2722454??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\介紹\5.bmp
?????文件?????1011224??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\介紹\71.mp4
?????目錄???????????0??2020-04-21?21:15??基于matlab?BP網絡車牌照識別\源程序\
?????文件???????39868??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\1.jpg
?????文件???????38920??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\10.jpg
?????文件???????56181??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\11.jpg
?????文件??????861592??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\12.jpg
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?????文件?????1446998??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\15.bmp
?????文件???????31142??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\2.jpg
?????文件???????35001??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\3.jpg
?????文件???????93105??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\4.jpg
?????文件??????128421??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\5.jpg
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?????文件????????6215??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\fmincg.m
?????文件????????1418??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\nnCostFunction.m
?????文件????????2742??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\nnmain.m
?????文件?????????346??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\predict.m
?????文件?????????160??2020-03-23?23:35??基于matlab?BP網絡車牌照識別\源程序\randInitializeWeights.m
............此處省略5740個文件信息