Dear all,
 
My name is Maria Lathouri and I am currently doing a PhD at Imperial College of London about time series of environmental variables in surface waters. I am trying to do some time plots with R but it seems that it is not working. 
The problem is that the time is not regular, for example, a small dataset can be seen below:
Date              pH
1/02/1998      5.5
5/03/1998      5
8/12/1998      6
1/02/1999      6.1
...
08/10/2000    7.2
 
I have used the function >plot(DATE, pH) and then >lines(pH), but the line does not join the points. I have used many combinations, e.g. >plot(DATE, pH) and then >lines(DATE, pH), where I get a plot with full of lines inside or just >plot(pH) and then >lines(pH) where the line connects the points but in x-axis I do not have the DATE. It says Index from 0 to 80. 
 
Do you know if there is a function where I can have in x-axis the DATE (irregular dates) and in y-axis the variable with a continuous line, showing how it changes through time?
 
I know that your time is valuable but I would appreciate it if you could help me. 
 
Thank you very much in advance for your time and help.
 
I am looking forward to hearing from you.
 
Sincerely yours 
Lathouri Maria

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