[mytopot]

我又用psolve做了一下：
>> y=dsolve('D2y=a*y/(b*y+1)','y(0)=1','y(1)=1','x')
Warning: Explicit solution could not be found.
> In dsolve at 333

y =

[ empty sym ]

感觉还是不对，常数a，b是不是要设置什么？help了dsolve的用法，里面没有关于常数设置的描述~~~~~~~~没办法了~~