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?
Thanks!
Why-so-serious

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