hey!!
Another data.frame question:
I have the following data.frame (pop)
pp=textConnection("
+ xloc yloc gonad ind Ene W Agent
+ 1 23 20 516.74 1 0.02 20.21 0.25
+ 2 23 20 1143.20 1 0.02 20.21 0.50
+ 3 23 20 250.00 1 0.02 20.21 0.25
+ 4 22 15 251.98 1 0.02 18.69 0.25
+ 5 24 18 598.08 1 0.02 18.69 0.25
+ 6 24 18 598.08 1 0.02 18.69 0.25
+ 7 22 17 598.08 1 0.02 18.69 0.25
+ 8 23 19 598.08 1 0.02 18.69 0.25
+ 9 21 18 598.08 1 0.02 18.69 0.25
+ 10 25 15 598.08 1 0.02 18.69 0.25
+ ")
pop <- read.table(pp, header = TRUE)
close(pp)
And I need to extract only 50% of the rows within same (xloc,yloc) until
I reach a number (n=4) of unique (xloc,yloc). For example:
1. If I need n=4, I will extract those rows that unique (xloc,yloc) sum
up 4. That would be rows 1 to 7.
2. However I need only need half (or rounded to half) the rows in unique
(loc,yloc).That means from (xloc=23, yloc=20) I will extract only rows 1
and 2 (n=1); then I will extract row 3 (22,15) to get n=2; then I will
extract row 4 (22,15) to get n=3; and finally extract row 5 (24,18) to
get n=4. This would get me the following data.frame with 5 rows instead
of 7 rows:
xloc yloc gonad ind Ene W Agent
1 23 20 516.74 1 0.02 20.21 0.25
2 23 20 1143.20 1 0.02 20.21 0.50
3 22 15 251.98 1 0.02 18.69 0.25
4 24 18 598.08 1 0.02 18.69 0.25
5 22 17 598.08 1 0.02 18.69 0.25
Hope I'm not too confusing.. and THANKS for any help!
Nico
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