function[RAB]=circ（xyN）
x1=0;
x2=0;
x3=0;
y1=0;
y2=0;
y3=0;
x1y1=0;
x1y2=0;
x2y1=0;
for?i?=1:N
x1=x1+x（i）;
x2=x2+x（i）*x（i）;
x3=x3+x（i）*x（i）*x（i）;
y1=y1+y（i）;
y2=y2+y（i）*y（i）;
y3=y3+y（i）*y（i）*y（i）;
x1y1=x1y1+x（i）*y（i）;
x1y2=x1y2+x（i）*y（i）*y（i）;
x2y1=x2y1+x（i）*x（i）*y（i）;
end
C=N*x2-x1*x1;
D=N*x1y1-x1*y1;
E=N*x3+N*x1y2-（x2+y2）*x1;
G=N*y2-y1*y1;
H=N*x2y1+N*y3-（x2+y2）*y1;
a=（H*D-E*G）/（C*G-D*D）;
b=（H*C-E*D）/（D*D-G*C）;
c=-（a*x1+b*y1+x2+y2）/N;

A=a/（-2）;?%x坐標
B=b/（-2）;?%y坐標
R=sqrt（a*a+b*b-4*c）/2;

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

?????文件?????276879??2012-08-01?10:26??校正\060-1.fig

?????文件?????415798??2012-07-18?09:51??校正\060.bmp

?????文件?????268030??2012-08-01?09:39??校正\060.fig

?????文件?????415798??2012-07-18?09:51??校正\080.bmp

?????文件?????415798??2012-07-18?09:51??校正\090l.bmp

?????文件?????415798??2012-07-18?09:51??校正\090r.bmp

?????文件?????283827??2012-08-01?09:34??校正\090r.fig

?????文件?????415798??2012-07-20?16:14??校正\90.bmp

?????文件????????533??2012-07-30?15:32??校正\circ.m

?????文件????4001078??2012-08-01?19:52??校正\correct_image_061g.bmp

?????文件???????3203??2012-07-28?22:38??校正\fitellipse.m

?????文件????????621??2012-08-01?09:57??校正\markpoint.m

?????文件???????3368??2012-08-04?10:40??校正\rec.asv

?????文件???????3399??2012-08-04?11:16??校正\rec.m

?????文件???????2067??2012-08-01?15:54??校正\rec2.asv

?????文件???????2067??2012-08-01?15:55??校正\rec2.m

?????文件???????3777??2012-07-27?15:30??校正\shiyan5.m

?????文件???????1626??2012-08-01?11:04??校正\test.asv

?????文件???????1668??2012-08-01?16:43??校正\test.m

?????文件???????4018??2012-08-01?10:09??校正\test2.asv

????..A.SH.?????36864??2012-07-18?09:51??校正\Thumbs.db

?????文件???????1538??2012-08-02?16:59??校正\trapezial_correction-wrong.m

?????文件???????3308??2012-08-02?17:23??校正\trapezial_correction.asv

?????文件???????1695??2012-08-04?10:09??校正\trapezial_correction.m

?????文件???????1480??2012-07-26?20:43??校正\Untitled.m

?????文件???????4075??2012-07-25?15:44??校正\Untitled3.m

?????文件???????3845??2012-07-23?08:58??校正\Untitled5.m

?????文件???????3914??2012-07-23?15:35??校正\Untitled6.m

?????文件?????128822??2012-07-29?20:25??校正\截圖.jpg

?????目錄??????????0??2013-04-09?09:07??校正

............此處省略3個文件信息