function?h=circle（rx0y0CNb）
%circle.m
%circle?adds?circles?to?the?current?plot
%
%check?the?number?of?input?argument

if?nargin<1r=[];end;
if?nargin==2error（‘Not?enough?arguments‘）;end;
if?nargin<3x0=[];y0=[];end;
if?nargin<4C=[];end;
if?nargin<5Nb=[];end

%set?up?the?default?values

if?isempty（r）r=1;end;
if?isempty（x0）x0=0;end;
if?isempty（y0）y0=0;end;
if?isempty（Nb）Nb=300;end;
if?isempty（C）C=get（gca‘colororder‘）;end

%work?on?the?variable?sizes

x0=x0（?:?）;
y0=y0（?:?）;
r=r（?:?）;
Nb=Nb（?:?）;

if?isstr（C）C=C（?:?）;end;
if?length（x0）~=length（y0）error（‘length（x0）~=length（y0）‘）;end

%how?many?rings?are?ploted

if?length（r）~=length（

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

?????文件???????1366??2010-04-07?17:48??circle.m

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

?????????????????1366????????????????????1