searchers and those offering help. Neither of the above names appear

to be used at present.

> 1. Please always reply to the list unless there is a compelling reason

> to keep the discussion private. You will have a better chance of

> getting something useful that way.

>

> 2. I don't know what you mean by "I don't have a fixed number of

> variables." You have to specify at least the number of variables and

> how many levels each has in order to work out what you requested,

> which is **NOT** the number of permutations but the number of

> combinations AFAICS, which is exactly what expand.grid will give you.

>

> 3. Maybe what you're looking for is the ... arguments in function

> calls, which would be used along the lines of:

>

> myfun <- function( x,y,...)

> {

> ## some code

> combs <- expand.grid(...)

> ## some more code

> }

>

> Any good R tutorial will tell you about this if this is unfamiliar.

>

> 4. Another possibility might be to deliver a list of named variables

> as an argument and then use do.call, e.g.

>

> myfun <- (x,y, alist)

> {

> ## some code

> combs <- do.call(expand.grid, alist)

> ## some more code

> }

>

> ?do.call and/or a tutorial for details.

>

> 5. Otherwise, maybe someone else can figure out what you're looking for.

>

> Cheers,

> Bert

>

>

>

> Bert Gunter

> Genentech Nonclinical Biostatistics

> (650) 467-7374

>

> "Data is not information. Information is not knowledge. And knowledge

> is certainly not wisdom."

> Clifford Stoll

>

>

>

>

> On Sat, May 16, 2015 at 11:16 AM, WRAY NICHOLAS

> <

[hidden email]> wrote:

>> I might be but doesn't expand.grid need a defined and listed number of

>> inputs? The problem I'm having is that the number of variables is not

>> fixed, so I'm not sure whether I can reference the variable number of

>> variables by using a vector -- haven't had time to try yet But thanks

>> anyway Nick Wray

>>

>> On 16 May 2015 at 14:28, Bert Gunter <

[hidden email]> wrote:

>>>

>>> Are you trying to reinvent ?expand.grid ?

>>>

>>> -- Bert

>>>

>>> Bert Gunter

>>> Genentech Nonclinical Biostatistics

>>> (650) 467-7374

>>>

>>> "Data is not information. Information is not knowledge. And knowledge

>>> is certainly not wisdom."

>>> Clifford Stoll

>>>

>>>

>>>

>>>

>>> On Fri, May 15, 2015 at 1:40 PM, WRAY NICHOLAS

>>> <

[hidden email]> wrote:

>>> > I am trying to build a programme which will work out the permutations of

>>> > a

>>> > number of variables, eg a=0 to 1, b=0 to 1, and c=0 to 2, so

>>> > permutations

>>> > would be (0,0,0), (1,0,0), (0,1,0)... etc In this case there would be 2

>>> > x

>>> > 2x 3 = 12 permutations. If the number of variables are fixed it's easy

>>> > to

>>> > loop round with nesting

>>> >

>>> > However I don't have a fixed number of variables, so I have a variable

>>> > number of loops. I am trying to use a recursive function to do this and

>>> > have been building it up step-wise

>>> >

>>> > I want to return a list of all the permutations at the end, but the

>>> > programme I have so ar doesn't return a full list, but just the first

>>> > element

>>> >

>>> > 2 things -- 1 I don't see why this is happening, and 2 is this the right

>>> > way to approach this problem? I cannot find find anything about this in

>>> > R

>>> > on the net

>>> >

>>> > recursfunc1<-function(xf,shiftvecf,vlistf){

>>> > if(xf<4){

>>> > xf<-xf+1

>>> > vlistf[[length(vlistf)+1]]<-shiftvec[xf]

>>> > #print(paste(xf,"and",shiftvec[xf]))

>>> > print(vlistf)

>>> > #print(shiftvec[xf])

>>> > xf<-recursfunc1(xf,shiftvecf,vlistf)}

>>> > return(vlistf)}

>>> >

>>> > shiftvec<-c(2,1,1,0)

>>> > vlist<-list()

>>> > perm<-recursfunc1(xf=0,shiftvecf=shiftvec,vlistf=vlist)

>>> > perm

>>> >

>>> > I want perm to return the elements of shiftvec as a list so that I can

>>> > then

>>> > do all the permutations as the next stage, but it only returns the first

>>> > element of shiftvec

>>> >

>>> > Thanks, Nick Wray

>>> >

>>> > [[alternative HTML version deleted]]

>>> >

>>> > ______________________________________________

>>> >

[hidden email] 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.

>>

>>

>

> ______________________________________________

>

[hidden email] 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.