R help - Jun 2017 - Keep only those values in a row in a data frame which occur only once.

Dear All,

I have a file data.txt as follows:

Name_1,A,B,C
Name_2,E,F
Name_3,I,J,I,K,L,M

I will read this with:
my_data<-
read.csv("data.txt",header=FALSE,col.names=paste0("V",
seq(1:10)),fill=TRUE)

Then the file will have 10 columns. I am assuming that each row in data.txt
will have at the max 10 entries.

Note: Here each row will have a different number of columns in data.txt but
each row will have 10 ( some trailing blank columns ) columns.

My query is how can I keep only the unique elements in each row? For
example: I want the row 3 to be Name_3,I,J,K,L,M

Please note I don't want the 2nd I to appear.

How can I do this?

Best Regards,
Ashim

	[[alternative HTML version deleted]]

Hi Ashim,
One way is this, assuming that your data frame is named akdf:

akdf<-t(apply(akdf,1,function(x) return(unique(x)[1:length(x)])))

If you want factors instead of strings, more processing will be required.
Jim

On Mon, Jun 12, 2017 at 3:23 PM, Ashim Kapoor <ashimkapoor at gmail.com>
wrote:
> Dear All,
>
> I have a file data.txt as follows:
>
> Name_1,A,B,C
> Name_2,E,F
> Name_3,I,J,I,K,L,M
>
> I will read this with:
> my_data<-
read.csv("data.txt",header=FALSE,col.names=paste0("V",
> seq(1:10)),fill=TRUE)
>
> Then the file will have 10 columns. I am assuming that each row in data.txt
> will have at the max 10 entries.
>
> Note: Here each row will have a different number of columns in data.txt but
> each row will have 10 ( some trailing blank columns ) columns.
>
> My query is how can I keep only the unique elements in each row? For
> example: I want the row 3 to be Name_3,I,J,K,L,M
>
> Please note I don't want the 2nd I to appear.
>
> How can I do this?
>
> Best Regards,
> Ashim
>
>         [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.

> I have a file data.txt as follows:
> 
> Name_1,A,B,C
> Name_2,E,F
> Name_3,I,J,I,K,L,M
> 
> My query is how can I keep only the unique elements in each row? For
> example: I want the row 3 to be Name_3,I,J,K,L,M
> 
> Please note I don't want the 2nd I to appear.
> 
> How can I do this?
Use unique() on each row and pad with NA?

Example:
uniq10 <- function(x, L=10) {
	u <- unique(x)
	c(u, rep(NA, L-length(u)) )
}

as.data.frame(  t( apply(tmp, 1, uniq10)  )  )

assuming tmp is the name of your initial data frame.

S Ellison




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