[R] curve fitting with given term

[gregor rolshausen]

ok. sorry for being blurry.

I have x,y data, that probably fits a asymptotic curve (asymptote at N). 
now I want to fit a curve onto the data, that gives me the N. therefore 
I thought to fit an e-function, namely N(1-e^(y/x)) onto the data and 
get the N from the fitted curves' equation.
in the course of this, I was looking for a R-function to fit a given 
function to data.
(I believe there is some implementation in MatLab for this kind of 
question, anyhow, I wanted to look in R as well...)

I am not an expert, so excuse my misuse of terms. I hope my problem 
graspable...?

cheers,
gregor




Uwe Ligges wrote:
>
>
> gregor rolshausen wrote:
>> hello,
>> I want to fit a curve to a simple x,y dataset - my problem is, that I 
>> want to fit it for the following term:
>>
>> n(1-e^x/y) - so I get the n constant for my data...
>
> Not an R problem in the first place, but the question arises what 
> "n(1-e^x/y)" means, its is just some scalar value so far. I am looking 
> for some equation ...
>
> Uwe Ligges
>
>
>
>> can anyone help/comment on that?
>>
>> cheers,
>> gregor
>>
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