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On Jan 17, 2011, at 4:38 PM, André Dias wrote:
OK!!
So, the ideia is from the 1st matrix get the 2nd matrix with the use
of a vector.
is it possible?
Peter B already gave you an answer.
> m[c(2,7, 8), c(1,4,6, 7)]
V1 V4 V6 V7
[1,] 7 3 16 9
[2,] 3 2 9 18
[3,] 13 16 8 9
In the example I have a 10x10 matrix and I get from that one a
second 4x3 matrix selected from a vector.
Then you should have presented the logical conditions for selecting
that matrix rather than expecting us to guess what they might be.
Please (re?)read the Posting Guide about what is expected of
questioners regarding presenting complete examples of data and code.
--
David.
thanks
ADias
2011/1/17 David Winsemius <dwinsem...@comcast.net>
On Jan 17, 2011, at 11:16 AM, ADias wrote:
Hi,
yes it works perfectly.
I have another question:
Is there way of selecting with a vector the values I wish to take
out from a
matrix.
Example:
I have this matrix and I want to take out the numbers in bold and
get the
second matrix below
This is a plain text mailing list (despite what the Nabble mirror
may (mis-)lead you into believing) ... no bold.
--
david.
m
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 17 1 6 5 19 2 19 1 15 8
[2,] 7 7 20 3 2 16 9 9 19 13
[3,] 2 4 3 11 18 11 14 13 3 1
[4,] 3 7 5 7 17 18 10 6 5 15
[5,] 8 20 13 10 8 12 20 19 1 16
[6,] 9 14 1 12 12 12 17 18 10 17
[7,] 3 10 11 2 12 9 18 6 19 9
[8,] 13 2 17 16 18 8 9 14 9 16
[9,] 9 4 11 4 1 17 9 7 20 12
[10,] 9 1 4 8 8 19 19 8 17 18
[,1] [,2] [,3] [,4]
[1,] 7 3 16 9
[2,] 3 2 9 18
[3,] 13 16 8 9
thanks
AD
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David Winsemius, MD
West Hartford, CT
David Winsemius, MD
West Hartford, CT
______________________________________________
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