[R] R - Reading a horizontally arranged csv file, replacing values and saving again

[William Dunlap]

Read the help file for write.table
   ?write.table
and look at the descriptions of its arguments.
  > df <- data.frame(Text=c("Abe","Ben",NA,"David"), Age=c(19, NA, 12, 10))
  > write.table(file=stdout(), t(df), sep=",")
  "V1","V2","V3","V4"
  "Text","Abe","Ben",NA,"David"
  "Age","19",NA,"12","10"
  > write.table(file=stdout(), t(df), quote=FALSE, na="", sep=",")
  V1,V2,V3,V4
  Text,Abe,Ben,,David
  Age,19,,12,10




Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Mon, Oct 1, 2018 at 2:24 AM, Manoranjan Muthusamy <
ranjanmano167 using gmail.com> wrote:

> I have a horizontally arranged CSV file
> <https://www.dropbox.com/s/0ukyuifvpq1olqk/samplefile.csv?dl=0> (
> samplefile.csv) with headers are in the first column. Also, each row has a
> different number of columns. I want to read this CSV file, replace one of
> the cell value and save again as a CSV file with the same format as the
> original file with exactly same number of columns and rows. It sounds like
> a simple task, but I am struggling to find a way. I tried to do this with
> the help of this
> <https://stackoverflow.com/questions/17288197/reading-a-
> csv-file-organized-horizontally>
>  and this
> <https://stackoverflow.com/questions/20308621/how-do-i-
> write-a-csv-file-in-r-where-my-input-is-written-to-the-file-as-row>
> posts,
> but still, I can't get the output the way I want. Can somebody help me
> here?
>
> My attempt using the answer in this post
> <https://stackoverflow.com/questions/17288197/reading-a-
> csv-file-organized-horizontally>
> to
> read the CSV file (samplefile.csv) gives me the following output where
> headers are kinda messed up and empty cells are replaced with NA values
> which is not what I want
>
> aaa <- read.tcsv("samplefile.csv")
> aaa
>
>      Header.1 Header.2..units. Header.3..units. Header.3..units..11
> Some text           0.0625                0             2648962
> <NA>           0.0625             1200             6647473        <NA>
>           0.0625             1380                  14        <NA>
>      0.2500             1500                  15        <NA>
> 0.6250             1620                 NA6        <NA>
> 1.3125             1740                 NA7        <NA>
> 2.4375             1860                 NA8        <NA>
> 3.5625             1980                 NA9        <NA>
> 4.6250             2100                 NA10       <NA>
> 5.0000             2220                 NA11       <NA>
> 5.0000             2340                 NA12       <NA>
> 4.6250             2460                 NA13       <NA>
> 3.5625             2580                 NA14       <NA>
> 2.4375             2700                 NA15       <NA>
> 1.3125             2820                 NA16       <NA>
> 0.6250             2940                 NA17       <NA>
> 0.2500             3060                 NA18       <NA>
> 0.0625             3180                 NA19       <NA>
> 0.0000             3300                 NA20       <NA>
> 0.0000            18000                 NA
>
> Also, I am not sure how to go back to original format when I save the file
> again after a modification (for example after replacing a cell value)
>
> I tried saving the file again by using t (transpose) as given below
>
> write.csv(t(aaa), file ="samplefile_e.csv", row.names=T)
>
> but still, there are following issues in the saved file
>
>    1. messed up headers
>    2. empty cells are replaced with NA
>    3. when I open the file in a text editor all the values are shown as
>    characters
>
> Thanks,
> Mano
>
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>
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