Hi,
            I am trying to show time( HH:MM:SS) in my x-axis. I have these 
two questions.

1. The error in the code is 

Error in axis(1, at = data$Time, labels = data$Time, las = 2, cex.axis = 
1.2) : 
  (list) object cannot be coerced to type 'double'

Should I use 'POSIXCt' or 'strptime' ?

2. I have times that are repeated because it is the next or previous day. 
But I want to show the times and data points in sequence - as they are in 
the data frame - along the axis.

Thanks,
Mohan

        X1       X2             X3                      X4 
OldGenAfterFullGC      X6               X7      PermGenAfterFullGC  Time
1        0              3285    873856          3456              3285 
1256128         12862              12862                19:36:16
2     3285      30437   873856          31324             30437 1256128 
39212              39212                19:36:26
3   312755      313565   873856         313843            313565  1214080 
182327             182327               20:36:27
4   313565      281379  873856          313789            281379 1213248 
182338             147729               21:36:29
5        0              3285    873856          3456              3285 
1256128         12862              12862                19:36:16

plot(data$Time,levels(data$PermGenAfterFullGC)[data$PermGenAfterFullGC],col="darkblue",pch=2,type="b", 
ylab="Megabytes", xlab="Time",las=2,lwd=2, cex.lab=1,cex.axis=1,xaxt="n")

axis(1, at = data$Time, labels = data$Time, las = 2,cex.axis=1.2)
text(data$Time,data$Time, data$Time, 2, cex=1.45)


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