[R] Skipping lines and incomplete rows

[Rui Barradas]

Or maybe it's better to coerce Temp and Press to numeric, if they are 
variables temperature and presssure.

dat$Time <- as.Date(dat$Time, format="%m/%d/%Y")
dat$Temp <- as.numeric(dat$Temp)
dat$Press <- as.numeric(dat$Press)

This makes those '#N/A' values NA.

Rui Barradas

Em 10-07-2012 09:34, Rui Barradas escreveu:
> Hello,
>
> My approach was slightly different, to use readLines to take care of the
> header and read.table for the data. This works with the new dataset
> you've posted, but we must use the option comment.char = "".
>
> Try the following.
>
>
> head <- readLines("test.txt", n=4)[4]
> dat <- read.table("test.txt", skip=5, sep=";", stringsAsFactors=FALSE,
> comment.char="c")
> names(dat) <- unlist(strsplit(head, ";"))
>
> dat$Time <- as.Date(dat$Time, format="%m/%d/%Y")
> dat$Temp[dat$Temp == '#N/A'] <- NA
> dat$Press[dat$Press == '#N/A'] <- NA
> dat
>
>
> It works with me, good luck.
>
> Rui Barradas
>
> Em 10-07-2012 06:41, vioravis escreveu:
>> Thanks a lot Rui and Arun.
>>
>> The methods work fine with the data I gave but when I tried the two
>> methods
>> with the following semi-colon separated data using sep = ";". Only the
>> first
>> 3 columnns are read properly rest of the columns are either empty or NAs.
>>
>>
>> **********************************************************************************************
>>
>> Remove this line
>> Remove this line
>> Remove this line
>> Time;Actual Speed;Actual Direction;Temp;Press;Value1;Value2
>> ;[m/s];[°];°C;[hPa];[MWh];[MWh]
>> 1/1/2012;0.0;0;#N/A;#N/A;0.0000;0.0000
>> 1/2/2012;0.0;0;#N/A;#N/A;0.0000;0.0000
>> 1/3/2012;0.0;0;#N/A;#N/A;1.5651;2.2112
>> 1/4/2012;0.0;0;#N/A;#N/A;1.0000;2.0000
>> 1/5/2012;0.0;0;#N/A;#N/A;3.2578;7.5455
>> ***********************************************************************************************
>>
>>
>> I used the following code:
>> dat1<-read.table("testInput.txt",sep=";",skip=3,fill=TRUE,header=TRUE)
>> dat1<-dat1[-1,]
>> row.names(dat1)<-1:nrow(dat1)
>>
>> Could you please let me know what is wrong with this approach?
>>
>> Thank you.
>>
>> Ravi
>>
>> --
>> View this message in context:
>> http://r.789695.n4.nabble.com/Skipping-lines-and-incomplete-rows-tp4635830p4635952.html
>>
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>>
>
> ______________________________________________
> R-help at r-project.org mailing list
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> and provide commented, minimal, self-contained, reproducible code.