[R] expand.grid function

dxc13 dxc13 at health.state.ny.us
Mon Dec 24 05:41:16 CET 2007

Yes, that works perfectly.  Thank you for your help!


Charilaos Skiadas-3 wrote:
> Hi Derek,
> On Dec 23, 2007, at 10:59 PM, dxc13 wrote:
>> useR's,
>> I have used expand.grid() several times and like the results it  
>> gives me.  I
>> am now trying something with it that I have not been able to get to  
>> work.
>> For any n column matrix I would like to run this function on those  
>> n columns
>> and store the results.
>> For example, if my matrix has 1 column then this is just expand.grid 
>> (x =
>> column1).  If my matrix has two columns, then I want expand.grid(x =
>> column1, y = column2), and so on for any number of columns...
> Does this do what you want  (x is the matrix)?
> do.call(expand.grid, as.data.frame(x))
>> In a program I am writing, the user can specify any matrix.  Does  
>> anyone
>> know of a way for R to calculate this based on what the input  
>> matrix is?
>> e.g. if this user gives a 3 column matrix, I want to be able to  
>> perform
>> expand.grid() on these 3 columns without having to hard code it b/c  
>> I want
>> to have this small function embedded in my code and the results  
>> stored as a
>> variable.
>> If this isn't clear, I can try to be more detailed.  Thank you for any
>> thoughts.
>> Derek
> Haris Skiadas
> Department of Mathematics and Computer Science
> Hanover College
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