hey,
thanks and I actually ready found such packages such as nlme, but i failed
to found the comment for restrictions, so.anyway, thanks fro your help.
James
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it is an assignment, haha~~
I just simplify the question and i could do that in Excel using solver. I
just wonder whether I can find a way to do that in R. The main problem is
adding restrictions, I managed to do one question without restrictions in R
by nls.
James
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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 a10, a+b19,b3, d0 and the starting
any suggestion? actually I just wanna know if there is a package for non
linear estimation with restriction, thanks. I am a new for R
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