Hi,
             I am able to create a graph with this code but the decimal 
numbers are not plotted accurately because the ylim values are not set 
properly. x-axis is proper.

How do I accurately set the ylim for duration.1 column ?

Thanks,
Mohan

set1$duration<- as.POSIXct(paste('2013-08-24', set1$duration))
plot(set1$duration,set1$duration.1,type="b",col = "blue",  ylab="", xaxt = 
'n', xlab="",las=2,lwd=2.5, lty=1,cex.axis=2.5)
# now plot you times
axis(1, at = set1$duration, labels = set1$duration, las = 2,cex.axis=2.5)

   duration duration.1
2  16:03:41       0.05
3  17:03:41       0.27
4  18:03:43       1.22
5  19:03:45       1.51
6  20:03:47       1.27
7  21:03:48       1.15
8  22:03:50       1.22
9  23:03:52       1.27
10 00:03:54       1.27
11 01:03:55       1.22
12 02:03:57       1.26
13 03:03:59       1.57
14 04:04:01       1.31
15 05:04:03       1.24


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