[R] transforming a .csv file column names as per a particular column rows using R code

[David L Carlson]

You can also get the Tool column repeated by tricking reshape() into letting
you use Tool in the v.name and idvar arguments:

> dta1 <- read.csv( text=
+ "Tool,Step_Number,Data1,Data2
+ A,1,0,1
+ A,2,3,2
+ A,3,2,3
+ B,1,3,2
+ B,2,1,2
+ B,3,3,2
+ ")
# Repeat the first column. R will append .1 to the second copy.
> dta2 <- reshape(dta1[, c(1, 1:4)], v.names=c("Tool", "Data1", "Data2"),
     timevar="Step_Number", idvar="Tool.1", direction="wide")
> rownames(dta2) <- NULL
> colnames(dta2) <- gsub("\\.", "_", colnames(dta2))
> dta2
  Tool_1 Data1_1 Data2_1 Tool_2 Data1_2 Data2_2 Tool_3 Data1_3 Data2_3
1      A       0       1      A       3       2      A       2       3
2      B       3       2      B       1       2      B       3       2

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352



> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of arun
> Sent: Sunday, October 14, 2012 1:29 PM
> To: siddu479
> Cc: R help
> Subject: Re: [R] transforming a .csv file column names as per a
> particular column rows using R code
> 
> HI,
> If you need the "Tool" column repeated,
> Try this:
> dat1<-read.table(text="
> Tool Step_Number Data1 Data2 Data3
> A 1 0 1 2
> A 2 3 1 4
> A 3 2 1 3
> B 1 3 2 1
> B 2 1 2 3
> B 3 3 2 0
> ",sep="",header=TRUE,stringsAsFactors=FALSE)
> 
> dat3<-with(dat1,aggregate(dat1[,3:5],list(Tool=Tool),function(x) x))
> dat3
> #Tool Data1.1 Data1.2 Data1.3 Data2.1 Data2.2 Data2.3 Data3.1 Data3.2
> Data3.3
> #1    A       0       3       2       1       1       1       2
> 4       3
> #2    B       3       1       3       2       2       2       1
> 3       0
> dat4<-do.call(data.frame,lapply(lapply(dat3[,-1],function(x)
> x),function(x) cbind(Tool=dat3[,1],x)))
> colnames(dat4)<-gsub(".*\\.(Tool)","\\1",gsub("[V]","",colnames(dat4)))
> dat4[grepl("Data.*",colnames(dat4))]<-
> sapply(dat4[grepl("Data.*",colnames(dat4))],function(x)as.numeric(as.ch
> aracter(x)))
>  dat4
> #  Tool Data1.2 Data1.3 Data1.4 Tool Data2.2 Data2.3 Data2.4 Tool
> Data3.2
> #1    A       0       3       2    A       1       1       1    A
> 2
> #2    B       3       1       3    B       2       2       2    B
> 1
>   Data3.3 Data3.4
> 1       4       3
> 2       3       0
>  str(dat4)
> #'data.frame':    2 obs. of  12 variables:
> # $ Tool   : Factor w/ 2 levels "A","B": 1 2
> # $ Data1.2: num  0 3
> # $ Data1.3: num  3 1
>  #$ Data1.4: num  2 3
>  #$ Tool   : Factor w/ 2 levels "A","B": 1 2
>  #$ Data2.2: num  1 2
>  #$ Data2.3: num  1 2
>  #$ Data2.4: num  1 2
> # $ Tool   : Factor w/ 2 levels "A","B": 1 2
> # $ Data3.2: num  2 1
> # $ Data3.3: num  4 3
> # $ Data3.4: num  3 0
> 
> A.K.
> 
> 
> 
> 
> ----- Original Message -----
> From: siddu479 <onlyfordigitalstuff at gmail.com>
> To: r-help at r-project.org
> Cc:
> Sent: Sunday, October 14, 2012 12:13 PM
> Subject: [R] transforming a .csv file column names as per a particular
> column rows using R code
> 
> Hello all,
> I have a .csv file like below.
> Tool,Step_Number,Data1,Data2... etc up to 100 columns.
> A,1,0,1
> A,2,3,1
> A,3,2,1
> .
> .
> B,1,3,2
> B,2,1,2
> B,3,3,2
> .
> .
> ...... so on upto 50 rows
> where the column "*Tool*" has distinct steps in second column
> "*Step_Number*",but both have same entries in Step_Number column.
> I want the output like below.
> 
> Tool_1,Data1_1,Data2_1,Tool_2,Data1_2,Data2_2,Tool_3,Data1_3,Data2_3...
> so
> on
> A,0,1,A,3,1,A,2,1
> B,3,2,B,1,2,B,3,2
> ......
> so on.
> 
> basically I am transposing entire data based on a specific column row
> values
> and renaming the column headers.
> I have a shell script based on awk which can do this task, but the
> script is
> taking exceptionally higher processing time.
> 
> So I am looking for a script in R which can save the time.
> "Please revert to me if the problem description is not clear."
> 
> Regards
> Sidda
> 
> 
> 
> 
> -----
> Sidda
> Business Analyst Lead
> Applied Materials Inc.
> 
> --
> View this message in context:
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> per-a-particular-column-rows-using-R-code-tp4646137.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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