Yohan:
First, thanks so much for the virtually instantaneous reponse. I really
appreciate it.
It seems I now have a different problem. I did an update.packages() and
that resulted in getting timeDate package installed.
Here is what happens now. Note that as soon as I load RMySQL, I can't
print the dateTime object DT. But, I can do math on it and then print
the result by turning it into characters. It does seem odd that dt (June
13) converts to DT (June 12th). I assume this has to do with timezones.
Perhaps if you tell me exactly where you obtained your RMySQL and
timeDate libraries, that would help. I am running Ubuntu (Intrepid).
At any rate, this is definitely progress. Again, I appreciate your help.
Elizabeth
e...@fibonacci:/etc/apt$ R
R version 2.7.1 (2008-06-23)
Copyright (C) 2008 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
Natural language support but running in an English locale
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library(timeDate)
> dt<-"1947-06-13"
> myFC<-"America/NewYork"
> DT<-timeDate(dt, format="%Y-%m-%d", FinCenter=myFC)
> DT
America/NewYork
[1] [1947-06-12 20:00:00]
> DT + 3600*24
America/NewYork
[1] [1947-06-13 20:00:00]
>
> library(RMySQL) # For db access
> DT
Error in function (object, ...) :
Invalid generic function in 'usemethod'
> foo<-DT + 3600*24
> foo
Error in function (object, ...) :
Invalid generic function in 'usemethod'
> as.character(foo)
[1] "1947-06-13 20:00:00"
Yohan Chalabi wrote:
"EN" == Elizabeth Nichols <betsy.nich...@plexlogic.com>
on Thu, 05 Mar 2009 05:45:40 -0500
EN> Hello:
EN> I am trying to use fCalendar for date arithmetic and the
EN> RMySQL package
EN> for accessing a MySQL database. The fCalendar math operations
EN> seem to
EN> work fine UNTIL I load the RMySQL package. Here is a
EN> demonstration:
EN>
EN> e...@fibonacci:~/Desktop/amCharts/rsa-metrics$ R
EN>
EN> R version 2.7.1 (2008-06-23)
EN> Copyright (C) 2008 The R Foundation for Statistical Computing
EN> ISBN 3-900051-07-0
EN>
EN> R is free software and comes with ABSOLUTELY NO WARRANTY.
EN> You are welcome to redistribute it under certain conditions.
EN> Type 'license()' or 'licence()' for distribution details.
EN>
EN> Natural language support but running in an English locale
EN>
EN> R is a collaborative project with many contributors.
EN> Type 'contributors()' for more information and
EN> 'citation()' on how to cite R or R packages in publications.
EN>
EN> Type 'demo()' for some demos, 'help()' for on-line help, or
EN> 'help.start()' for an HTML browser interface to help.
EN> Type 'q()' to quit R.
EN>
EN> [Previously saved workspace restored]
EN>
EN> > library(fCalendar, pos=2) # For date math
EN> Loading required package: MASS
EN> Loading required package: fUtilities
EN> Rmetrics Package fUtilities (290.76) loaded.
EN> Loading required package: fEcofin
EN> Rmetrics Package fCalendar (270.78.2) loaded.
EN> The new version of 'fCalendar' has been renamed to 'timeDate'
EN> > dt<-1947-06-13
EN> > myFC<-America/NewYork
EN> > DT<-timeDate(dt, zone=myFC, FinCenter=myFC)
EN> > DT + 3600
EN> America/NewYork
EN> [1] [1947-06-13 01:00:00]
EN> > library(RMySQL, pos=4) # For db access
EN> > DT + 3600
EN> Error in (DT, 3600) :
EN> no slot of name Data for this object of class timeDate
EN> In addition: Warning message:
EN> In (DT, 3600) :
EN> trying to get slot Data from an object (class timeDate) that
EN> is not
EN> an S4 object
EN> >
EN>
EN> As you can see, I can do date arithmetic (DT + 3600) before
EN> I load the
EN> RMySQL package but not after. The pos arguments to the
EN> library()
EN> calls are an unsuccessful attempt to get R to use the Rmetrics
EN> fCalendar
EN> package that works instead of whatever gets loaded by RMySQL.
EN>
EN> I have Googled until my fingers turned blue and I can't find
EN> any useful
EN> information to fix this. Any help would be most appreciated.
EN> Thanks,
EN> eanichols
Hi Elizabeth,
Please note that the new version of 'fCalendar' has been renamed to
'timeDate'
I tried your example with the new timeDate package and it worked fine
for me.
HTH
Yohan
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