[R] non linear estimation

[JamesHuang]

hey guys, 

I got a problem when I tried to estimate parameters in a non linear function
with restrictions. The function is: Y=a+(b+c*x)*exp(-d*x), given values of x
and y. The least squares method is required and there are many restriction
on a,b,c,d, such as a>10, a+b<19,b<3, d>0 and the starting values are given
for c,d. how can I realize such estimation? or which package should i use?
thanks a lot~~ 


Regards, James 
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