[R] Receiving NaN message

[David L Carlson]

And (re: "dat[,ID]"), the page on "Extract or Replace Parts of an Object":

? Extract

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Rui Barradas
Sent: Tuesday, January 17, 2017 5:51 AM
To: PIKAL Petr <petr.pikal at precheza.cz>; Robert Piliero <robert.piliero at gmail.com>; r-help at r-project.org
Subject: Re: [R] Receiving NaN message

Hello,

And in addition to what Jim and Petr said, take a look at ?%in%.

Rui Barradas

Em 17-01-2017 10:50, PIKAL Petr escreveu:
> Hi
>
> And above what Jim adviced you should look also at
> ?match
>
> help page.
>
> Cheers
> Petr
>
>> -----Original Message-----
>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Robert
>> Piliero
>> Sent: Monday, January 16, 2017 9:10 PM
>> To: r-help at r-project.org
>> Subject: [R] Receiving NaN message
>>
>> Hello,
>>
>> I am working on a Coursera assignment and have combined 332 files into a
>> single data frame called "dat". The dataframe has 4 columns,
>>
>> 1. Date
>> 2. Sulfate (numerical values)
>> 3. Nitrate  (numerical  values)
>> 4. ID # (numerical values).
>>
>> Our assignment is to write a function pollutantmean <- function(directory,
>> pollutant, ID). whereby we can calculate the mean by inputting the pollutant
>> name and ID #.
>>
>> I have reached the stage of subsetting the date e.g. by ID # 1-10, however
>> when I do so and then calculate the mean of this subset I receive the NaN
>> message (even though I have instructed R to disregard the "NA"'s).
>>
>>
>> *Beginning Code: *
>> getwd()
>> read.csv(specdata)
>> specdata <- ("C:/Users/rober/specdata")
>> list.files(specdata)
>> files_full <- list.files(specdata, full.names=TRUE) files_full dat <- data.frame()
>> for (i in 1:332){
>>    dat <- rbind(dat,read.csv(files_full[i]))
>> }
>> str(dat)
>> mean(dat$sulfate, na.rm=TRUE)
>>
>> *Code which generated the NaN message. *
>> dat1_10 <- dat[which(dat[,ID] ==1:10),]
>> mean(dat1_10$sulfate, na.rm=TRUE)
>>
>> Am I making a mistake in subsetting the rows with ID's 1:10? Any advice
>> would be appreciated.
>>
>> Thank you,
>>
>> Robert
>>
>> Robert J. Piliero
>>
>> Cell: (617) 283 1020
>> 38 Linnaean St. #6
>> Cambridge, MA, 02138
>> USA
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
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______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.