R help - Dec 2011 - Paste() - Get all possible combinations from multiple vectors

Hello fellow R-users,

Given are three vectors and the outcome would be all possible combinations in
combination with the paste() function.
For example:

x <- c(1:3)
y <- letters[1:3]
z <- LETTERS[1:3]

My result would thus be 18 names based on all possible combinations between
these vectors:
"1 a A" "1 a B", "1 a C", "1 b A",
"1 b B", "1 b C", "1 c A", "1 c B",
"1 c C", etc.

To solve the issue above I would use:

paste(rep(x, each=9), rep(y, each=6), z)

This is a very straightforward example, but when I have vectors of different
sizes, it will be much more difficult (for me) to create this. Is there an
easier way to do this?

Many thanks in advance,

  -- Stan

	[[alternative HTML version deleted]]

outer(outer(x, y, paste), z, paste)

Michael

On Tue, Dec 6, 2011 at 7:53 AM, Gaj Stan (BIGCAT)
<stan.gaj at maastrichtuniversity.nl> wrote:
> Hello fellow R-users,
>
> Given are three vectors and the outcome would be all possible combinations
in combination with the paste() function.
> For example:
>
> x <- c(1:3)
> y <- letters[1:3]
> z <- LETTERS[1:3]
>
> My result would thus be 18 names based on all possible combinations between
these vectors:
> "1 a A" "1 a B", "1 a C", "1 b A",
"1 b B", "1 b C", "1 c A", "1 c B",
"1 c C", etc.
>
> To solve the issue above I would use:
>
> paste(rep(x, each=9), rep(y, each=6), z)
>
> This is a very straightforward example, but when I have vectors of
different sizes, it will be much more difficult (for me) to create this. Is
there an easier way to do this?
>
> Many thanks in advance,
>
> ?-- Stan
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.

Hi. Maybe this will help you:

expand.grid(x,y,z)
apply(expand.grid(x,y,z),1, function (x) paste(x[1], x[2], x[3],
sep=""))

Andrija

On Tue, Dec 6, 2011 at 1:53 PM, Gaj Stan (BIGCAT) <
stan.gaj@maastrichtuniversity.nl> wrote:
> Hello fellow R-users,
>
> Given are three vectors and the outcome would be all possible combinations
> in combination with the paste() function.
> For example:
>
> x <- c(1:3)
> y <- letters[1:3]
> z <- LETTERS[1:3]
>
> My result would thus be 18 names based on all possible combinations
> between these vectors:
> "1 a A" "1 a B", "1 a C", "1 b A",
"1 b B", "1 b C", "1 c A", "1 c B",
"1
> c C", etc.
>
> To solve the issue above I would use:
>
> paste(rep(x, each=9), rep(y, each=6), z)
>
> This is a very straightforward example, but when I have vectors of
> different sizes, it will be much more difficult (for me) to create this. Is
> there an easier way to do this?
>
> Many thanks in advance,
>
>  -- Stan
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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]]