On Mar 25, 2010, at 9:21 PM, tj wrote:
Anyone who can help me with this?
I have 48 observations (I dont want to alter their order). I want to
group
these observations into 16 blocks. So I should have 3 observations
for each
block. This is what I did in R, but it has warnings.
y #contains my 48 observations
[1] 2.4 2.4 2.4 2.2 2.1 1.5 2.3 2.3 2.5 2.0 1.9 1.7 2.2 1.8 3.2 3.2
2.7 2.2
2.2
[20] 1.9 1.9 1.8 2.7 3.0 2.3 2.0 2.0 2.9 2.9 2.7 2.7 2.3 2.6 2.4 1.8
1.7 1.5
1.4
[39] 2.1 3.3 3.5 3.5 3.1 2.6 2.1 3.4 3.0 2.9
Consider:
> ygrp <- matrix(y, ncol=3, byrow=TRUE)
> ygrp
[,1] [,2] [,3]
[1,] 2.4 2.4 2.4
[2,] 2.2 2.1 1.5
[3,] 2.3 2.3 2.5
[4,] 2.0 1.9 1.7
[5,] 2.2 1.8 3.2
[6,] 3.2 2.7 2.2
[7,] 2.2 1.9 1.9
[8,] 1.8 2.7 3.0
[9,] 2.3 2.0 2.0
[10,] 2.9 2.9 2.7
[11,] 2.7 2.3 2.6
[12,] 2.4 1.8 1.7
[13,] 1.5 1.4 2.1
[14,] 3.3 3.5 3.5
[15,] 3.1 2.6 2.1
[16,] 3.4 3.0 2.9
> ygrp[16, ]
[1] 3.4 3.0 2.9
--
David.
g=c(0,0,0) #storage vector
for (i in 1:16){
+ g[i]=y[(3*i-2) : (3*i)]
+ }
There were 16 warnings (use warnings() to see them)
g[1]
[1] 2.4
g[2]
[1] 2.2
###### g[1] should show 2.4 2.4 2.4
###### g[2] should show 2.2 2.1 1.5
######g[16] should show 3.4 3.0 2.9
Can you please tell me how I should correct my program?
Thank you.
~tj
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