Hello, I have a problem with using replace() to convert a vector of dates 
from yyyy-mm-dd to julian date.

For example, I type 

        replace(x,2004-05-14,134)

and I receive an error:

        Error in `[<-.data.frame`(`*tmp*`, list, value = 134) : 
  new columns would leave holes after existing columns

If I can successfully convert, I have a script that will convert all of 
the dates in the vector (i.e., the same line repeated with the next 
yyyy-mm-dd and corresponding julian day).  Any help would be much 
appreciated.

Thank you,
Kirsten

Kirsten Barrett
Mendenhall Postdoctoral Fellow, USGS
Alaska Science Center
4210 University Drive
Anchorage, AK
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