[R] Generating list of vector coordinates
Bill.Venables@csiro.au
Bill.Venables at csiro.au
Tue Mar 29 02:09:28 CEST 2005
> rev(expand.grid(k = 1:5, j = 1:4, i = 1:3))
i j k
1 1 1 1
2 1 1 2
3 1 1 3
4 1 1 4
5 1 1 5
6 1 2 1
7 1 2 2
8 1 2 3
...
55 3 3 5
56 3 4 1
57 3 4 2
58 3 4 3
59 3 4 4
60 3 4 5
>
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Ronnen Levinson
Sent: Tuesday, 29 March 2005 9:21 AM
To: r-help at stat.math.ethz.ch
Subject: [R] Generating list of vector coordinates
Hi.
Can anyone suggest a simple way to obtain in R a list of
vector
coordinates of the following form? The code below is Mathematica.
In[5]:=
Flatten[Table[{i,j,k},{i,3},{j,4},{k,5}], 2]
Out[5]=
{{1,1,1},{1,1,2},{1,1,3},{1,1,4},{1,1,5},{1,2,1},{1,2,2},{1,2,3},{1
,2,4},{1,2,
5},{1,3,1},{1,3,2},{1,3,3},{1,3,4},{1,3,5},{1,4,1},{1,4,2},{1,4,3},
{1,4,
4},{1,4,5},{2,1,1},{2,1,2},{2,1,3},{2,1,4},{2,1,5},{2,2,1},{2,2,2},
{2,2,
3},{2,2,4},{2,2,5},{2,3,1},{2,3,2},{2,3,3},{2,3,4},{2,3,5},{2,4,1},
{2,4,
2},{2,4,3},{2,4,4},{2,4,5},{3,1,1},{3,1,2},{3,1,3},{3,1,4},{3,1,5},
{3,2,
1},{3,2,2},{3,2,3},{3,2,4},{3,2,5},{3,3,1},{3,3,2},{3,3,3},{3,3,4},
{3,3,
5},{3,4,1},{3,4,2},{3,4,3},{3,4,4},{3,4,5}}
I've been futzing with apply(), outer(), and so on but haven't
found
an elegant solution.
Thanks,
Ronnen.
P.S. E-mailed CCs of posted replies appreciated.
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