Try to not use 'attach', or if you do, at least do a 'detach'.  Use 'with'
or just fully qualify the names.  'attach' can lead to other problems.
Every time you use it, you will get similar messages.

On Thu, Dec 31, 2009 at 10:50 AM, Gerald I. Evenden <
geraldi.evenden@gmail.com> wrote:

> I do not know if I have a problem or not.
>
> The R script at the end of this email seems to
> run properly and a I get a boxplot that looks
> proper but I get the long string of messages
> during execution of the script looking like:
>
> ...
>       The following object(s) are masked from dat ( position 8 ) :
>
>         sugar
>
>
>        The following object(s) are masked from dat ( position 9 ) :
>
>         sugar
>
>
>        The following object(s) are masked from dat ( position 10 ) :
>
>         sugar
>
> ...
> I have absolutely no idea what they mean.
>
> An interprestion or suggestion would be greatly
> appreciated.
>
> Running on Kubuntu using
> R version 2.6.2 (2008-02-08)
>
> PS: I'm obviously a newbie and this script is my first serious
> attempt at using R.
>
> R text follows: --------------------
>
> source("dbi-start.R")
> am_pm<-"PM Glucose for"
> fc_year<-2008
> bfc_head<-"select blood.sugar from blood where"
> bfc_PM<-"blood.time>\"22:00:00\" and blood.time<=\"23:59:00\""
> bfc_tail<-"order by blood.date,blood.time"
> bfc<-"blood.date"
> nmon<-c(2:12,1)
>
> lst<-list() # init null list
> for (i in 1:12) {
>        year<-fc_year
>        fc_date <- paste(bfc,">=\"", year, "-", i, "-01\" and ", sep="")
>        if (i == 12) year<-fc_year+1 else year<-fc_year
>        fc_date <-      paste(fc_date,bfc,"<\"",year,"-",nmon[i],"-01\" and
> ",sep="")
>        fc_res<-dbSendQuery(gielog, paste(bfc_head,fc_date,bfc_PM,bfc_tail))
>        dat<-fetch(fc_res, n=-1)
>        attach(dat)
>        lst<-c(lst,list(sugar))
> }
> boxplot(lst,
>        main=paste(am_pm, fc_year),
>        mai=c(.5,.5,.5,.3),
>        axis=FALSE,
>        ylab="Glucose", xlab="Month")
> axis(2,seq(40,200,by=10))
> axis(4,seq(40,200,by=10))
> axis(1,1:12)
>
>
> --
> The whole religious complexion of the modern world is due
> to the absence from Jerusalem of a lunatic asylum.
> -- Havelock Ellis (1859-1939) British psychologist
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?

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