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

[matthewbk]

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])
...

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




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