[R] Questions remaining: define any character as na.string RE: merging data list in to single data frame

[Umesh Rosyara]

Dear Uwe and R community members 

Thank you Uwe for the help. 

I have still a question remaining, I am trying to find answer from long
time.  

While exporting my data, I have some characters mixed into it. I want to
define any characters as na.string? Is it possible to do so?

Thanks;

Umesh 



-----Original Message-----
From: Uwe Ligges [mailto:ligges at statistik.tu-dortmund.de] 
Sent: Monday, April 04, 2011 12:22 PM
To: Umesh Rosyara
Cc: r-help at r-project.org; rosyaraur at gmail.com
Subject: Re: [R] merging data list in to single data frame



On 04.04.2011 16:41, Umesh Rosyara wrote:
> Dear R community members
>
>
>
> I did find a good way to merge my 200 text data files in to a single data
> file with one column added will show indicator for that file.
>
>
>
> filelist = list.files(pattern = "K*cd.txt")


I doubt you meant "K*cd.txt" but "^K[[:digit:]]*cd\\.txt$".



# the file names are K1cd.txt
> .................to K200cd.txt
>
> data_list<-lapply(filelist, read.table, header=T, comment=";", fill=T)


Replace by:

data_list <- lapply(filelist, function(x)
    cbind(Filename = x, read.table(x, header=T, comment=";", fill=TRUE))


And then:

result <- do.call("rbind", data_list)

Uwe Ligges


>
>
>
> This will create list, but this is not what I want.
>
>
>
> I want a single dataframe (all separate dataframes have same variable
> headings) with additional row for example
>
>
>
> ; just for example, two small datasets are created by my component
datasets
> are huge, need automation
>
> ;read from file K1cd.txt
>
> var1  var2  var3    var4
>
> 1           6         0.3         8
>
> 3          4         0.4         9
>
> 2          3         0.4         6
>
> 1           0.4    0.9          3
>
>
>
> ;read from file K2cd.txt
>
> var1  var2  var3    var4
>
> 1           16         0.6        7
>
> 3          14         0.4         6
>
> 2         1 3         0.4         5
>
> 1          0.6    0.9          2
>
>
>
> the output dataframe should look like
>
>
>
> Fileno  var1  var2  var3    var4
>
> 1              1           6         0.3        8
>
> 1              3          4         0.4         9
>
> 1              2          3         0.4         6
>
> 1              1           0.4      0.9        3
>
> 2              1           16       0.6        7
>
> 2              3          14         0.4        6
>
> 2              2         1 3         0.4        5
>
> 2              1          0.6         0.9       2
>
>
>
> Please note that new file no column is added
>
>
>
> Thank you for the help.
>
>
>
> Umesh R
>
>
>
>
> 	[[alternative HTML version deleted]]
>
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