On May 6, 2011, at 2:28 PM, Pavan G wrote:
Hello All,
Let's say I have data spanning all quadrants of x-y plane. If I plot
data
with a certain x and y range using xlim and ylim or by using
plot.formula as
described in this link:
http://www.mathkb.com/Uwe/Forum.aspx/statistics/5684/plotting-in-R
*DF <- data.frame(x = rnorm(1000), y = rnorm(1000))
*
*> str(DF)*
*'data.frame': 1000 obs. of 2 variables:
$ x: num -0.0265 0.1554 -0.1050 -0.9697 -0.3430 ...
$ y: num 1.386 -1.356 -1.170 0.426 0.204 ...
Now, let's plot the data meeting the criteria you indicated above:
plot(y ~ x, data = DF, subset = (x > 0) & (y > 0))*
How then can I get the length of that data? If have 1000 data points
and 200
lie in x,y>0, how do I find that the length is 200?
with(DF, sum((x > 0) & (y > 0), na.rm=TRUE) ) # since it is 1 for
TRUE and 0 for false after coercion.
--
David Winsemius, MD
West Hartford, CT
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