matlab dsolve求解微分方程组出错，求高人指点，万分感谢

程序如下：
syms v1 v2 x y
S=dsolve('Dx=v1-v2*x/(x^2+y^2)^(1/2)','Dy=-v2*y/(x^2+y^2)^(1/2)','x(0)=0','y(0)=100')
运行之后：??? Error using ==> dsolve
Error, (in dsolve/IC) The 'implicit' option is not available when giving Initial Conditions.

答案：我用的matlab2010b 没有解析解
>> S=dsolve('Dx=v1-v2*x/(x^2+y^2)^(1/2)','Dy=-v2*y/(x^2+y^2)^(1/2)','x(0)=0','y(0)=100','t')
Warning: Explicit solution could not be found. 
> In dsolve at 101
 
S =
 
[ empty sym ]

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