[R] Filtering few column from one data frame based on another data frame

[Rui Barradas]

Hello,

You're right, that's the result of not having test data (and being in a 
hurry).
Anyway, apologies to the op, and thanks for the correction.

Rui Barradas
Em 13-10-2012 19:13, arun escreveu:
> Hi Rui,
>
> By running your code on an example dataset:
> set.seed(1)
> dat1<-data.frame(Sno=sample(1:50,10,replace=TRUE),Data_1=rnorm(10,15),Data_2=rnorm(10,25),Data_3=runif(10,0.5))
>
> dat2<-read.table(text="
> Data_2
> Data_3
> ",sep="",header=FALSE,stringsAsFactors=FALSE)
>
>
> keep <- which(!names(dat2) %in% names(dat1))
> dat1[, keep]
> #[1] 14 19 29 46 11 45 48 34 32  4
> I guess, the OP needs both "Sno" and "Data_1" i the resultant dataframe.
>
> #My code:
> res<-dat1[!colnames(dat1)%in%dat2[,1]]
> head(res)
> # Sno   Data_1
> #1  14 14.17953
> #2  19 15.48743
> #3  29 15.73832
> #4  46 15.57578
> #5  11 14.69461
> #6  45 16.51178
> A.K.
>
>
>
> ----- Original Message -----
> From: Rui Barradas <ruipbarradas at sapo.pt>
> To: siddu479 <onlyfordigitalstuff at gmail.com>
> Cc: r-help at r-project.org
> Sent: Saturday, October 13, 2012 12:10 PM
> Subject: Re: [R] Filtering few column from one data frame based on another data frame
>
> Hello,
>
> Try the following.
>
> keep <- which(!names(data2) %in% names(data1))
> data1[, keep]
>
> Hope this helps,
>
> Rui Barradas
> Em 13-10-2012 15:48, siddu479 escreveu:
>> Dear R-Users and experts,
>> This is my first post in this forum.
>>
>> I have two csv files file1 and file2.
>> file1(many rows and columns) is read into dataframe *data1*
>> File2 is read into dataframe *data2* which have only one column of data
>> which contains the column names that need to be removed from dataframe
>> *data1*columns and update the *data1 *data frame.
>> Example:
>> data1 <-read.csv(file1.......,header=T)
>> Sno,Data_1,Data_2,Data_3
>> 1,2,3,4
>>
>> data2<- read.csv(file2,......header=F)
>> Data_2
>> Data_3
>>
>> The output *data1.new* data frame  should be like this
>>
>> Sno,Data_1
>> 1,2
>>
>> So I request the R code to accomplish this task.
>>
>> Regards
>> Sidda
>>
>>
>>
>>
>> --
>> View this message in context: http://r.789695.n4.nabble.com/Filtering-few-column-from-one-data-frame-based-on-another-data-frame-tp4646072.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>