Hi everyone,
i am trying to group close numbers in a vector.
For example i have a vector x = [1 2 4 7 9 10 15].
I want the code to pick 1 2 4 (max difference between successive numbers
is
2) and assign them to variable a, then pick 7 9 10 and assign them to b
and
15 to c. But since i do not know how many groups there will be the code
should create a,b,c etc as it goes along. So if x = [1 2 4 7 9 10 15 20]
it
should create a,b,c and d this time and assign 20 to d (while the others
remain the same).
I think the following function should do basically what you want:
codeit = function(x){
action = c(TRUE, diff(x) <= 2)
g = paste('x', '1', sep='')
j = 1
for (i in 2: length(x)){
if (action[i-1] != action[i] | action[i] == FALSE) j = j+1
g[i] = paste('x', j, sep='')
}
df = data.frame(x, grp.x=g)
}
------------------------------------------
Robert W. Baer, Ph.D.
Professor of Physiology
Kirksville College of Osteopathic Medicine
A. T. Still University of Health Sciences
800 W. Jefferson St.
Kirksville, MO 63501
660-626-2322
FAX 660-626-2965
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