Greetings,
I am trying to take values in one field and write the ranks for those values to a new field. For example:
3 -> 2
2 -> 1
5 -> 3
6 -> 4
9 -> 6
7 -> 5
In an ideal world, I'd like to deal with ties in a particular way (as follows), but one step at a time...
3 -> 2
2 -> 1
2 -> 1
2 -> 1
5 -> 3
9 -> 5
7 -> 4
Using numpy and scipy, I have gotten this to work using just Python (PythonWin), outside of ArcMap. The following averages the ranks of ties, which is good enough for now:
import numpy
import scipy
from scipy import stats
x=numpy.ma.array([0,1,1,1,2,2,4,4,5,6])
rank = stats.mstats.rankdata()
print rank
Results in:
[[ 1 3 3 3 5.5 5.5 7.5 7.5 9 10 ]]
At this point, i am trying to figure out how to pass values from a field into the input array and then write the results back to the other field. I'm not sure if a cursor is the best way to do this, or if all the values in a field can be passed into an array. Again, I'm a python newbie, so any ideas or suggestions are welcome.
Thanks,
-Erik
