On Feb 2, 2011, at 8:22 AM, Ben Bolker wrote:
Ramya <ramya.victory <at> gmail.com> writes:
I have the code for the density plot
j <- 8
plot(density(diff_in_sample[,1]), main = list.files()[j])
for(i in 1:25){
lines(density(diff_in_sample[,i]))
}
This gives me an error
Error in density.default(diff_in_sample[, i]) :
'x' contains missing values
[snip]
?NA
lines(na.omit(density(diff_in_sample[,i])))
I don't know if that will work, but since Bolker wrtote it, it's got
a reasonable probability of being correct code. I generally use the
na.rm argument inside the density function rather than na.omit wrapped
around it.
lines(density(diff_in_sample[,i], na.rm=TRUE))
Although if there are a lot of NA's then the registration of the lines
results are going to be way off from the original plot axis.
--
David.
Consider replacing the loop by apply() [no efficiency
gain, but more compact code]
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David Winsemius, MD
West Hartford, CT
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