[R] Copying a dataframe

[John Kane]

With the orginal data.frame being df1

df2  <- data.frame(matrix(rep(NA, nrow(df1)*ncol(df1)), nrow = nrow(df1)))df2  <- data.frame(matrix(rep(NA, nrow(df1)*ncol(df1)), nrow = nrow(df1)))


John Kane
Kingston ON Canada


> -----Original Message-----
> From: sahanasrinivasan.91 at gmail.com
> Sent: Thu, 7 Mar 2013 17:23:10 +0000
> To: r-help at r-project.org
> Subject: [R] Copying a dataframe
> 
> Hi, I am trying to create a data frame using the dimensions of another
> data
> frame that I have input. This is the code I am using:
> 
> tab is the data frame that is input.
> c.leng<-length(tab[,1]); r.leng<-length(tab[1,]);
> opdf<-data.frame(ncol=c.leng, nrow=r.leng);
> a<-1;
> while(a<=c.leng)
> {
> opdf[[1]][a]<-tab[[1]][a];
> a<-a+1;
> }
> 
> This is the error message I am getting:
> Error in `[[<-.data.frame`(`*tmp*`, 1, value = c(4626L, 1L)) :
> replacement has 2 rows, data has 1
> 
> I have tried printing out the dimensions of tab and mat separately to see
> if they are the same, but tab is 4626 rows, 21 columns (which is
> correct),
> while mat says 1row and 2columns.
> 
> Would be grateful if you could tell me where I am going wrong? Is there
> are
> better function to transfer/copy values?
> 
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> 
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