[R] Plotting Lines Through multiple groups

[clara_eco]

Hi I have data in the following format
Cort Day Animal
23    0      1
27    3      1
24    0      2
27    1      2
34    2      2
30    3      2
24    4      2
20    0      3
24    1      3
28    2      3
34    4      3
etc.
It is measured across time(day) however no every individual is measured the
same number of times.  All I want to do is plot the Raw data and then run a
line connecting the data points of each individual animal, for the example
above there would be three lines as there are three animals.
I've tried, gplots, lattice and car but I'm not really figuring it out, any
help would be greatly appreciated!

Thanks 
Clara


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