[R] displaying label meeting condition (i.e. significant, i..e p value less than 005) in plot function

From: Umesh Rosyara <rosyaraur_at_gmail.com>
Date: Sat, 05 Mar 2011 12:29:44 -0500


Dear R users,  

Here is my problem:  

# example data
name <- c(paste ("M", 1:1000, sep = "")) xvar <- seq(1, 10000, 10)
set.seed(134)
p <- rnorm(1000, 0.15,0.05)
dataf <- data.frame(name,xvar, p)
plot (dataf$xvar,p)
abline(h=0.05)  

# I can know which observation number is less than 0.05 which (dataf$p < 0.05)
[1] 12 20 80 269 272 338 366 368 397 403 432 453 494 543 592 691 723 789
811
[20] 854 891 931 955
 

I want to display (label) corresponding names on the plot above: means that 12th observation M12, 20th observation M20 and so on. Please note that I have names not in numerical sequience (rather different names), just provided for this example to create dataset easily.  

Thanks in advance  

Umesh R  

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