[R] Concatenation

[Shi, Tao]

Still not clear.  Follow the posting guide and some examples always help.   

Not sure how you "concatenate" numbers?

You can try, for example,

apply(df[1:10,], 2, paste, collapse=" ")

but this will turn everything into strings.  Is this what you want?

..Tao




----- Original Message ----
> From: santana sarma <aimanusarma at gmail.com>
> To: David Winsemius <dwinsemius at comcast.net>
> Cc: r-help at r-project.org
> Sent: Thu, May 20, 2010 9:21:33 PM
> Subject: Re: [R] Concatenation
> 
> Hi David,

SORRY - I am trying to be more clearer this time.

Let's 
> say the dataframe has some rows and columns, with unique rownames and
column 
> names. The rest of the data in the dataframe are just numbers.

I wish to 
> concatenate those rows. That means : I wish to concatenate first
10 rows' 
> values in one row, then next 20 rows's values in the next row ....
and so 
> on.

Similarly, for columns : The first 10 column's values will be one 
> below the
other ... and so on.

Cheers,


= = = = = = = = 
> =  = =


On Fri, May 21, 2010 at 3:53 PM, David Winsemius <
> ymailto="mailto:dwinsemius at comcast.net" 
> href="mailto:dwinsemius at comcast.net">dwinsemius at comcast.net>wrote:

>
> 
> 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
>
>

    [[alternative HTML 
> version deleted]]

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