Well, it seems a simple "c" will do.

e.g. 

df <- matrix(rnorm(100), ncol=4)
c(t(df[1:10,]))  # concatenate rows

c(df)  # concatenate columns






>
>From: santana sarma <aimanusarma@gmail.com>
>To: "Shi, Tao" <shidaxia@yahoo.com>; r-help@r-project.org
>Sent: Thu, May 20, 2010 11:45:25 PM
>Subject: Re: Concatenation
>
>
>Ok -let's forget about the dataframe. 
>
>
>Say, I have this (huge) spreadsheet that has some rows and columns, with unique rownames and column names. 
>
>Using R, I wish to FINALLY have a spreadsheet where the values of the first 10 rows remain in a single row. And, the values of the next 10 rows remain in the next row .... and so on.
>
>
>Example: 
>
>
>row1 = 2, 3.4, 5, 6
>row2 = 3, 4.3, 0, 2
>.......
>row 10 = 1,3, 4, 5
>
>
>new_row_should_be_like = 2, 3.4, 5, 6, 3, 4.3, 0, 2, ...... 1, 3, 4, 5  
>
>
>
>
>Similarly, 
>
>Similarly, for columns, the new spreadsheet should FINALLY contain : the values of the columns coming one below the other (i.e., resulting in a single column, without the identifiers). 
>
>
>col1   col2   col3......... col10 
>2       3         4                5
>1       2         5                0
>...........
>...........
>
>
>new_column_should_be_like = 
>2 
>1 
>...
>3 
>2 
>....
>4 
>5
>... 
>5
>0  
>.....
>......
>
>
>
>
>
>
>Cheers,
>
>
>
>
>= = = === = = = = =
>
>
>On Fri, May 21, 2010 at 5:51 PM, Shi, Tao <shidaxia@yahoo.com> wrote:
>
>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@gmail.com>
>>>>> To: David Winsemius <dwinsemius@comcast.net>
>>>>> Cc: r-help@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@comcast.net"
>>>>> href="mailto:dwinsemius@comcast.net">dwinsemius@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]]
>>
>>>>______________________________________________
>>
>>>>> ymailto="mailto:R-help@r-project.org"
>>>>> href="mailto:R-help@r-project.org">R-help@r-project.org mailing list
>>
>>>>> href="https://stat.ethz.ch/mailman/listinfo/r-help" target=_blank
>>>>> >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.
>>
>>
>>
>>
>


      
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