I am trying to do a natural breaks (Jenks) classification on a data set
with some 300,000 observations. I started with
salescat=classIntervals(sales, 100, style="jenks")
and cut this process off after it ran for 12 hours. Then I tried it with
just ten classes but this made no difference.
With a subset of just 300 observations, it runs for 36 seconds.
For 1,000 records, it runs seven minutes and then throws the following
error:
Error in if (mat2[l, j] >= (v + mat2[i4, j - 1])) { :
missing value where TRUE/FALSE needed
In addition: Warning message:
In val * val : NAs produced by integer overflow
I checked the data interactively; there are no missing or non-integer
values.
ArcMap classifies it instantaneously without hiccups and takes about ten
seconds for all 300,000 records (though limiting itself to a maximum of
32 classes).
Do you have any suggestions as to what I am doing wrong or what could be
done to resolve my problem?
Cheers,
Jochen
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