[R] Help with function "fitdistr" in "MASS"

[Saji Ren]

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.

Thank you in advanced,
Saji from Shanghai
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