R help - May 2016 - inserting row(column) in array or dataframe at specified row(column)

Hello dear R users,

Is there a function or package which can insert row, column or array in
another array at specified place (row or column)?

I have made several attempts at this function optimizing both speed, code
readability and ease of use. The functions are of following format:

appcol=function(original_array, inserted_object, column_number,
overwrite=FALSE)

# If overwrite=TRUE the columns after column_number are ovewritten by
inserted_object else the columns after column_number are shifted.

Now I have started using package dplyr and it seams that there is no
inserting function either. One can only append at the end or at the
beginning of tbl_df. Is it true?

	[[alternative HTML version deleted]]

If you can address your columns by name then order shouldn't matter. If the
column order does matter, perhaps a matrix is a better structure to use?

On Sun, May 1, 2016, 10:56 AM Jan Kacaba <jan.kacaba at gmail.com> wrote:
> Hello dear R users,
>
> Is there a function or package which can insert row, column or array in
> another array at specified place (row or column)?
>
> I have made several attempts at this function optimizing both speed, code
> readability and ease of use. The functions are of following format:
>
> appcol=function(original_array, inserted_object, column_number,
> overwrite=FALSE)
>
> # If overwrite=TRUE the columns after column_number are ovewritten by
> inserted_object else the columns after column_number are shifted.
>
> Now I have started using package dplyr and it seams that there is no
> inserting function either. One can only append at the end or at the
> beginning of tbl_df. Is it true?
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>
	[[alternative HTML version deleted]]

> On May 1, 2016, at 10:53 AM, Jan Kacaba <jan.kacaba at gmail.com>
wrote:
> 
> Hello dear R users,
> 
> Is there a function or package which can insert row, column or array in
> another array at specified place (row or column)?
> 
> I have made several attempts at this function optimizing both speed, code
> readability and ease of use. The functions are of following format:
> 
> appcol=function(original_array, inserted_object, column_number,
> overwrite=FALSE)
This does not offer code, only the list of formals. If you want help with
coding, then you should provide some. I remember a posting by Gabor Grothendieck
on StackOverflow (where he cited another blogger) where he demonstrated how to
implement a postfix "+" function like that of C, that I _think_ might
address this question but without a MWE and desired result I cannot do any
testing.
> 
>  If overwrite=TRUE the columns after column_number are ovewritten by
> inserted_object else the columns after column_number are shifted.
> 
> Now I have started using package dplyr and it seams that there is no
> inserting function either. One can only append at the end or at the
> beginning of tbl_df. Is it true?
Probably not. There's always:
> fortunes::fortune("Yoda")
Evelyn Hall: I would like to know how (if) I can extract some of the
information from the summary of my nlme.
Simon Blomberg: This is R. There is no if. Only how.
   -- Evelyn Hall and Simon 'Yoda' Blomberg
      R-help (April 2005)
> 	[[alternative HTML version deleted]]
One of _your_ tasks is now to learn "how" to tell gmail to post in
plaintext.

-- 

David Winsemius
Alameda, CA, USA

Hi

You can use rbind, cbind but you need to be aware of what objects you are
binding together.

mm<-matrix(rnorm(12), 3,4)
> rbind(mm[1:2,], 1:4, mm[3,])
           [,1]       [,2]       [,3]       [,4]
[1,] -0.2029407 -1.5910628 -0.2582281 -0.1649921
[2,] -0.6913951  0.3591561  0.8236836 -0.3592203
[3,]  1.0000000  2.0000000  3.0000000  4.0000000
[4,] -0.2096650 -2.3671913 -0.4444438  0.3846274

Anyway, you can append rows/columns and perform sort/order afterwards if you
consider ordering important.

Cheers
Petr



> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Jan
Kacaba
> Sent: Sunday, May 1, 2016 7:54 PM
> To: r-help at r-project.org
> Subject: [R] inserting row(column) in array or dataframe at specified
> row(column)
>
> Hello dear R users,
>
> Is there a function or package which can insert row, column or array in
> another array at specified place (row or column)?
>
> I have made several attempts at this function optimizing both speed, code
> readability and ease of use. The functions are of following format:
>
> appcol=function(original_array, inserted_object, column_number,
> overwrite=FALSE)
>
> # If overwrite=TRUE the columns after column_number are ovewritten by
> inserted_object else the columns after column_number are shifted.
>
> Now I have started using package dplyr and it seams that there is no
inserting
> function either. One can only append at the end or at the beginning of
> tbl_df. Is it true?
>
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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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