On Jun 26, 2015, at 3:02 PM, Rich Shepard wrote:
> On Fri, 26 Jun 2015, MacQueen, Don wrote:
>
>> I would have just assigned them all to the first day of the month, using
>> as.Date( paste0(allchem$sampdate,'-01') )
>> (or maybe the middle of the month represented by the 15th)
>> and then had a
On Fri, 26 Jun 2015, MacQueen, Don wrote:
I would have just assigned them all to the first day of the month, using
as.Date( paste0(allchem$sampdate,'-01') )
(or maybe the middle of the month represented by the 15th)
and then had a variable that was of the Date class in the base R (with
which I
I would have just assigned them all to the first day of the month, using
as.Date( paste0(allchem$sampdate,'-01') )
(or maybe the middle of the month represented by the 15th)
and then had a variable that was of the Date class in the base R (with
which I am familiar, no small consideration).
Depe
as.yearmon(allchem$sampdate)
worked for me.
David
On 26 June 2015 at 19:44, Rich Shepard wrote:
> Data file 'example.dat' has this format:
>
> stream,sampdate,param,quant
> B,1992-03,Cl,4
> B,1992-03,SO4,33
> B,1992-03,pH,8.43
> B,1992-04,Cl,4
> B,1992-04,SO4,32
> B,1992-04,pH,8.46
> B,1992-0
On Fri, 26 Jun 2015, Rich Shepard wrote:
allchem$sampdate <- as.yearmon(format(%Y-%m))allchem$sampdate
Reading the yearmon help page again led me to try
allchem$sampdate <- as.yearmon(allchem$sampdate)
which produces the following structure:
'data.frame': 2226 obs. of 4 variables
Data file 'example.dat' has this format:
stream,sampdate,param,quant
B,1992-03,Cl,4
B,1992-03,SO4,33
B,1992-03,pH,8.43
B,1992-04,Cl,4
B,1992-04,SO4,32
B,1992-04,pH,8.46
B,1992-05,Cl,4
B,1992-05,SO4,31
B,1992-05,pH,8.43
It's read into R with
allchem <- read.table('example.dat', stringsAsFacto
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