[R] Using multiple dat files

[David Winsemius]

On 11/5/24 22:29, Sibylle Stöckli via R-help wrote:
> Dear community
>
> To import multiple .dat  weather files I am using list.files().
> I intend to use the R package “ClimInd” to calculate different agroclimatic indicators.
>
> Question: Is there another solution to import multiple .dat files so that I can select elements from the list, e.g. one specific weather file (example AAR_DailyWeather)?
>   
>   
> # Import multiple .dat files weather data
> filelist <- list.files(path = "O:/Data-Work/……./Daten_RA-MeteoCH_1990-2021", pattern='*.dat', all.files= T, full.names= T)
> W <- lapply(filelist, function(x) read.table(x, header = TRUE, sep = "", colClasses = "numeric", comment.char = ""))
> W[[1]]

`W[[1]]` should be a data.frame, but it will not have the name 
"AAR_DailyWeather" unless you assign names using the values in `filelist`.


>> dd(data = W[[1]]$Precip, time.scale = W[[1]]$year)
It is unclear what this code snippet is supposed to represent. There is 
no function named `dd` in the base packages. There is a `dd` function in 
package Hmisc but if you use it you need to assign the results to an 
object name. Just executing the call will do nothing except perhaps 
checking to see if there are errors.
> Fehler in W[[1]]$year : $ operator is invalid for atomic vectors


Also unclear is how that error message came about. It seems to indicate 
that W[[1]] is not a dataframe. You can examine the `W` object with 
`str(W)`.

Looking at the help page for ClimInd::dd it appears that the 
'time.scale' argument is supposed to signify what time scale to assume, 
namely one of {month, season, year}. Pretty crappy documentation since 
it is unstated what type the allowable values are and the usage example 
shows

|time.scale = YEAR|

And there does not appear to be any definition of what the value of `YEAR` is supposed to be.

It appears to me that you have been assigned a task in a poorly 
documented package.

Contact the package author.

-- 

David.

>   
> Kind regards
> Sibylle
>   
>   
>   
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