[R] using its to import time series data with uneven dates

From: Sheri Conner Gausepohl <sheri_at_atmos.colostate.edu>
Date: Wed 13 Jul 2005 - 07:46:57 EST


Good day:

I am trying to use
readcsvIts("nwr_data_qc.txt",informat=its.format("%Y%m%d%h%M %Y"),header=TRUE,sep="",skip=0,row.names=NULL,as.is=TRUE,dec=".")

to read in a file (nwr_data_qc.txt) that looks like this:

Time Y M D H Min CO2

2000.18790   2000.  3.  9. 18. 30.    373.60
2000.20156   2000.  3. 14. 18. 30.    373.34
2000.22609   2000.  3. 23. 18.  0.    373.01

and R returns this:

         Y M D H Min CO2
<NA> 2000 3 9 18 30 373.60
<NA> 2000 3 14 18 30 373.34
<NA> 2000 3 23 18 0 373.01

I have tried every format option on the help page. How can I read in my decimal dates (e.g., 2000.18790)?

Note that these data (CO2) are irregularly spaced in time (Time).

Ultimately I would like to fit a trigonometric polynomial (first harmonic) to these data in order to smooth them and obtain values between measurements. Any suggestions you can provide on how to do this would be much appreciated.

Thank you for your help.

Sheri

Sheri L. Conner Gausepohl
Graduate Research Assistant
Department of Atmospheric Science
Colorado State University



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