On May 5, 2011, at 1:31 AM, Maximo Polanco wrote:
I have been trying to do a nls model and gives me the error of a
nonnumeric
argument
This is my data set
TT
FFT
V
C
table(file="c:/tt2.txt",header=T)
fit.model <- nls(TT~60*(1+alpha*(v/c)^beta),data=tt2,
start=list(alpha=1,
beta=3, v=1000))
Error in v/c : non-numeric argument to binary operator
You have (perhaps) defined a column name of "C" and then attempted to
reference it with "c". Since `c` is a (rather fundamental) function in
R, the interpreter has no problem accessing `c` but trying to take
the ratio of a scalar to a function fails.
You can try changing "c" to "C" above and it may "work", but in the
future, please heed the issues raised at the bottom of this trimmed
message!
(It would be much better to not use either "C" or "c" for object names
since they are both function names.)
?"C"
C {stats}
R Documentation
Sets Contrasts for a FactorDescription
Sets the "contrasts" attribute for the factor.
Usage
C(object, contr, how.many, ...)
is.numeric(tt2)
[1] FALSE
is.character(tt2)
[1] FALSE
as.numeric(tt2)
Error: (list) object cannot be coerced to type 'double'
This is my data set
TT
FFT
V
C
1
70.475
60
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plain text.
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David Winsemius, MD
West Hartford, CT
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