Help with function "fitdistr" in "MASS"

Please read the footer of this message.  ?fitdistr says

        x: A numeric vector.

and setting the class does not make it a numeric vector (it is just a 
label).  And fitdistr early on does

     if (missing(x) || length(x) == 0L || mode(x) != "numeric")
         stop("'x' must be a non-empty numeric vector")

so you do have a non-empty numeric vector.

It is likely that your data contains NAs, in which case the quoted 
result is correct.  But despite the posting guide we have no details 
of your 'mydata' and have to guess.

Hi, R users:

I want to fit my data into a normal distribution by using the command
"fitdistr" in "MASS".
I changed my data class from "ts" to "numeric" by

class(mydata)="numeric"

but after using "fitdistr", I got the result below

fitdistr(mydata,"normal")

 mean    sd
 NA     NA
(NA)   (NA)

the help doc of "fitdistr" does not mention anything about that, thus I need
your help.

The help page is not intended to be a very basic statistics/R textbook.

Thank you in advanced,
Saji from Shanghai
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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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