[R] argument "x" is missing in minpack.lm

Luigi Marongiu m@rong|u@|u|g| @end|ng |rom gm@||@com
Tue Jun 30 13:53:10 CEST 2020


But I get the same error even if I run:
```
parms = list(a=3261, b=10, x=CH$Cum_Dead[1:60])
O = nls.lm(parms, holling,
           lower=NULL, upper=NULL, jac = NULL)
> Error in fn(par, ...) : argument "x" is missing, with no default
```
the function to be optimized is:
```
function(a, b, x) {
  y = (a * x^2) / (b^2 + x^2)
  return(y)
}
```
so the parameters a, b, x are the same I called within nls.lm

On Tue, Jun 30, 2020 at 1:32 PM Sarah Goslee <sarah.goslee using gmail.com> wrote:
>
> You create objects A, B, and K, but then use A, B, and X in the call to nls.lm().
>
> I have no idea if nls.lm is the right tool for your job, but I do know that you need to use the same names.
>
> Sarah
>
> On Tue, Jun 30, 2020 at 6:01 AM Luigi Marongiu <marongiu.luigi using gmail.com> wrote:
>>
>> Hello,
>> I am trying to optimize a function with the function nls.lm from the
>> package minpack.lm. But I can't get it right:
>> ```
>> A = 3261
>> B = 10
>> K = c(8,   24,   39,   63,   89,  115,  153,  196,  242,  287,  344,  408,  473,
>>       546,  619,  705,  794,  891,  999, 1096, 1242, 1363, 1506, 1648, 1753,
>>       1851, 1987, 2101, 2219, 2328, 2425, 2575, 2646, 2698, 2727, 2771, 2818,
>>       2853, 2895, 2926, 2964, 2995, 3025, 3053, 3080, 3102, 3119, 3141, 3152,
>>       3159, 3172, 3182, 3196, 3209, 3220, 3231, 3239, 3246, 3252, 3261)
>> O = nls.lm(list(a=A, b=B, x=X), holling,
>>            lower=NULL, upper=NULL, jac = NULL)
>> > Error in fn(par, ...) : argument "x" is missing, with no default
>> ```
>> What am I missing?
>> Is nls.lm the right function for functions that are not linear?
>> Thank you
>> --
>> Best regards,
>> Luigi
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>
> --
> Sarah Goslee (she/her)
> http://www.sarahgoslee.com



-- 
Best regards,
Luigi



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