function?fx=Dx_backward（f）;
%?Dx_backward（f）?computes?backward?difference?with?respect?to?x?（or?j?the
%?idex?of?column）?for?coordinate?system?as?below
%?
%
%???????????x（j）
%????????|---------->
%????y（i）|
%????????|
%????????|
%????????V
%
%?Copyright?（c）?2001--2006?by?Chunming?Li
%?Author:?Chunming?Li?11/02/2003
%?Revision?by?Chunming?Li?7/24/2005

[nrnc]=size（f）;
fx=zeros（nrnc）;
fx（:2:nc）=f（:2:nc）-f（:1:nc-1）;

fx（:1）=f（:2）-f（:1）;?%?for?the?first?column?use?the?forward?difference?as?the?backward?difference

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????543??2006-01-15?14:02??GAC_Matlab\Dx_backward.m

?????文件????????555??2006-01-15?14:01??GAC_Matlab\Dx_forward.m

?????文件????????538??2006-01-15?14:03??GAC_Matlab\Dy_backward.m

?????文件????????545??2006-01-15?13:58??GAC_Matlab\Dy_forward.m

?????文件???????1260??2006-03-23?00:31??GAC_Matlab\EVOLUTION_GAC.m

?????文件???????1589??2006-03-23?00:33??GAC_Matlab\GAC_demo.m

?????文件????????456??2006-03-22?22:40??GAC_Matlab\gradientNorm_upwind.m

?????文件???????8134??2004-07-05?18:59??GAC_Matlab\noisyImg.bmp

?????文件???????3929??2006-03-23?00:29??GAC_Matlab\reinit_SD.m

?????文件????????120??2006-03-22?23:05??GAC_Matlab\sdf2circle.m

????..A.SH.??????7680??2006-03-16?19:51??GAC_Matlab\Thumbs.db

?????目錄??????????0??2006-03-23?00:27??GAC_Matlab

-----------?---------??----------?-----??----

????????????????25567????????????????????13