[R] R_nls_iter error: REAL() can only be applied to a 'numeric', not a 'logical'

[R. Michael Weylandt]

On Wed, Aug 1, 2012 at 11:40 AM, matthewbk <matthew_bk8 at hotmail.com> wrote:
> Hi
>
> I am using the nls function in R however it is causing the following error:
> REAL() can only be applied to a 'numeric', not a 'logical'
>
> Using traceback shows this occurs after the .Call(R_nls_iter, m, ctrl,
> trace) call. However I do not know how to debug this further to find out
> what is causing the error.
>
> The data I give the nls call definitely starts as numeric. The data.frame is
> generated by using the following:
>
> d = data.read('data.csv', header=FALSE)
> x = as.numberic(d[,1])
> y = as.numberic(d[,2])
> z = as.numberic(d[,3])
> ...

Certainly no "b" ?

>
> dat = data.frame(x,y,z...)
>
> nls is started by calling:
> mdl = nls(y ~ Model(x,y,z....,b1,b2,b3), data = dat)
>
> Thanks in advance for any help.
>
> Matthew
>
>

This one's actually tricky since that's an error arising from the C
code. I don't think there's an error in the C code, but let's do some
work on debugging. To start with, can you make a small reproducible
example following the advice given here:

http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

To wit, we don't have your "dat" data (use dput! but please, only a
small-ish subset)  nor the function "Model" and the lines of code
replaced by "..." worry me as well.

Best,
Michael

>
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