[R] Error in plotting non-linear regression

[Muhammad Rahiz]

It now works. Thanks both.

Muhammad





Peter Ehlers wrote:
> On 2010-04-22 11:09, Muhammad Rahiz wrote:
>   
>> Hello everyone,
>>
>> I'm trying to draw the non-linear regression curve to look at the
>> distance decay relationship between distance and correlation values. But
>> I'm not able to plot the curve as I'm struggling with the following
>> error ("parameters without starting value in 'data': x") and found no
>> answers online.*
>>
>> *Can anyone help...
>>
>> --
>> Muhammad*
>>
>>
>> * s1 cm
>> 1 0 0.57223196
>> 2 10 0.33110049
>> 3 20 0.11163181
>> 4 30 0.10242237
>> 5 40 0.09254315
>> 6 50 0.02739370
>> 7 60 0.02567137
>> 8 70 0.02492397
>> 9 80 0.03206637
>> 10 90 0.02487381
>> 11 100 0.01747584
>> 12 110 0.15977533
>> 13 120 0.13317708
>>
>> new <- data.frame(s1,cm)
>> plot(s1,cm)
>> f <- function(x,a,b){a*exp(-b*x)} fm <-
>> nls(cm~f(x,a,b),data=new,start=c(a=1,b=1)) co <- coef(fm)
>>     
>
> Presumably you want f(s1,a,b) in your nls call.
>
>   -Peter Ehlers
>
>   
>> curve(f(x,a=co[1],b=co[2]),add=TRUE,col="blue")
>>
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>>
>>
>>     
>
>