R help - May 2010 - Concatenation

Hi,

I have a dataframe with some 800 rows and 14 columns.

Could you please advise how I can concatenate the rows - one after another.
Similarly for columns, one below the other.

Many thanks.

Cheers,
Santana

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On May 20, 2010, at 11:05 PM, santana sarma wrote:
>  Hi,
>
> I have a dataframe with some 800 rows and 14 columns.
>
> Could you please advise how I can concatenate the rows - one after  
> another.
> Similarly for columns, one below the other.
Not sure exactly what you are after:

unlist might accomplish the second task.

Whether c(apply(df, 1, I)) would be satisfactory for the first task  
might depend on whether the columns in the dataframe were all of the  
same type. Now that I think of it, both soolutions would force the  
types to be that same.

?"c"
?I
?apply

df[1:nrow(df), ]   ...  would essentially give you the first request,  
but it would not be any different than just typing df. So .... what do  
intend this process to accomplish?

--

David Winsemius, MD
West Hartford, CT

A dummy way is to resequence or rematrix


olddata <- data.frame(matrix(rnorm(200), nrow=40))
newdata <- data.frame(matrix(as.vector(t(olddata)), nrow=nrow(olddata)/10))
dim(olddata)
dim(newdata)


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Sorry, I made a mistake. Should add "byrow = TRUE".
Using randomly created values can't check the result, a sequence will be
better.

olddata <- data.frame(matrix(1:200, nrow=40, byrow = TRUE))
newdata <- data.frame(matrix(as.vector(t(olddata)),
nrow=nrow(olddata)/10,byrow = TRUE))
dim(olddata)
dim(newdata)
olddata[1:2,]
newdata[1:2,]

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