From: jim holtman <jholtman_at_gmail.com>

Date: Mon, 21 Apr 2008 12:53:55 -0400

Date: Mon, 21 Apr 2008 12:53:55 -0400

# Seed and data frames X, Y and Z

set.seed(123) X=matrix(rnorm(300),ncol=5) Y=matrix(rpois(300,10),ncol=5) Z=matrix(rexp(300,1),ncol=5)

index <- seq(1, by=3, length=nrow(X))

FINAL <- matrix(ncol=5, nrow=3*nrow(X))

FINAL[index,] <- X FINAL[index + 1,] <- Y FINAL[index + 2,] <- Z

On Mon, Apr 21, 2008 at 11:44 AM, Jorge Ivan Velez
<jorgeivanvelez_at_gmail.com> wrote:

> Dear R-users,

*>
**> I've been working with three different data sets (X, Y and Z) with the same
**> dimension (i.e, n \times k). What I needed to do was to conform a 4th data
**> set, i.e. FINAL, which first row was the X's first row, its second row was
**> the Y's first row, and its third row was the Z's first row, and so on.
**>
**> My code is below. Is it possible to avoid the loop?
**>
**> Thanks in advance,
**>
**> Jorge
**>
**>
**>
**> # ----- Code starts here
**>
**> # Seed and data frames X, Y and Z
**> set.seed(123)
**> X=matrix(rnorm(300),ncol=5)
**> Y=matrix(rpois(300,10),ncol=5)
**> Z=matrix(rexp(300,1),ncol=5)
**>
**> # First five columns and rows
**> X[1:3,1:5]
**> Y[1:3,1:5]
**> Z[1:3,1:5]
**>
**> # FINAL' six rows
**> res=NULL; for(i in 1:nrow(X)) res=rbind(res,X[i,],Y[i,],Z[i,])
**> FINAL=data.frame(from.data=c('X','Y','Z'),res)
**> FINAL[1:9,1:6]
**>
**> # ----- Code ends here
**>
**> [[alternative HTML version deleted]]
**>
**> ______________________________________________
**> R-help_at_r-project.org mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
**> and provide commented, minimal, self-contained, reproducible code.
**>
*

-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Mon 21 Apr 2008 - 17:38:23 GMT

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