On Oct 15, 2009, at 11:39 AM, Steve Murray wrote:
Dear all,
I am attempting to subset a data frame based on a range of latitude
values. I want to extract the values of 'interception' where
latitude ranges between 50 and 60. I am doing this using the
following code, yet it doesn't return the results I expected:
test <- subset(int1901, Latitude>=50 & Latitude <60,
select=c(Latitude, Interception))
head(test)
Latitude Interception
2 6.25 0.04725863
3 6.75 67.02455139
82 50.75 51.74784088
83 51.25 57.04327774
84 51.75 51.51020432
85 52.25 53.30662537
As you can see, latitude values outside the 50 to 60 range have been
retained (e.g. the top two rows of 'test'). Why is this, and how can
I ensure that I subset the data as initially intended?
What does str(int1901) show to be the type for Latitude? (I'm guessing
it's a factor.)
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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