> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
> On Behalf Of Ted Harding
> Sent: Wednesday, December 22, 2010 2:39 PM
> To: r-help@r-project.org
> Subject: Re: [R] A question to get all possible combinations
>
> On
On 22-Dec-10 18:19:38, Ron Michael wrote:
> Let say, I have a matrix with 8 rows and 6 columns:_
> df1 <- matrix(NA, 8, 4)
> df1
> [,1] [,2] [,3] [,4]
> [1,] NA NA NA NA
> [2,] NA NA NA NA
> [3,] NA NA NA NA
> [4,] NA NA NA NA
> [5,] NA NA NA NA
> [6,]
Dear Ron,
On Wed, Dec 22, 2010 at 1:19 PM, Ron Michael wrote:
> Let say, I have a matrix with 8 rows and 6 columns:
>
>> df1 <- matrix(NA, 8, 4)
>> df1
> [,1] [,2] [,3] [,4]
> [1,] NA NA NA NA
> [2,] NA NA NA NA
> [3,] NA NA NA NA
> [4,] NA NA NA NA
> [5,]
which 6 cells do you want? do you want one from each column? You
could use expand.grid:
> x <- expand.grid(1:8, 1:8, 1:8, 1:8, 1:8, 1:8)
> str(x)
'data.frame': 262144 obs. of 6 variables:
$ Var1: int 1 2 3 4 5 6 7 8 1 2 ...
$ Var2: int 1 1 1 1 1 1 1 1 2 2 ...
$ Var3: int 1 1 1 1 1 1 1 1
Let say, I have a matrix with 8 rows and 6 columns:
> df1 <- matrix(NA, 8, 4)
> df1
[,1] [,2] [,3] [,4]
[1,] NA NA NA NA
[2,] NA NA NA NA
[3,] NA NA NA NA
[4,] NA NA NA NA
[5,] NA NA NA NA
[6,] NA NA NA NA
[7,] NA NA NA NA
[
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