[R] need help with a time series plotting problem

[vibhava]

sorry about the change in variable name (data has column named usgs700 but
code has usgs700). actually i am trying to get familiar with R as i need to
make more complex time series plots in near future (stackplots, scatterplot
etc.). Let me try to explain what i am intending to achieve here. below i
have copied first few lines of a large dataset (daily flow records for 4017
days at 8 usgs locations). first column is date and rest of them are flow
data measured at these 8 different location. now all i wish to do is to read
them in and make time series plots for the entire period of record for each
stations. i have attached some figures that i made in excel and i wish to do
something like this using R. 

I know my code might have some errors and that's the reason why i am
requesting for help from people who know R better than I do. i am R user for
less than a day but i know what i am trying to do is really simple and all i
need is to read 9 columns and make a simple time series plot.

i would appreciate if anyone can correct the code that i have written below
or if they have some alternate way of doing this i would be happy to learn
something new

regards

vibhava

Date	USGS700	USGS1000	USGS1500	USGS 1898	USGS1975	USGS2500	USGS2700	USGS2800
10/1/2000	0.05	0.57	2.32	2.27	4.11	29.45	29.45	29.45
10/2/2000	0.04	0.54	2.12	1.70	4.05	29.17	29.17	29.17
10/3/2000	0.03	0.48	1.93	1.98	3.96	28.88	28.88	28.88
10/4/2000	0.03	0.45	1.76	1.42	3.91	28.60	28.60	28.60
10/5/2000	0.03	0.42	1.64	1.27	3.82	28.32	28.32	28.32
10/6/2000	0.03	0.42	1.53	1.13	3.74	28.26	28.26	28.26
10/7/2000	0.11	0.51	1.59	5.66	3.68	28.23	28.23	28.23
10/8/2000	0.16	0.45	1.70	3.40	3.62	27.84	27.84	27.84
10/9/2000	0.10	0.42	1.78	2.55	3.54	26.56	26.56	26.56

> setwd("J:/Rstuff/flow")                                                                                    
> # defining the working directory
> flow=read.delim("flow.dat",header=TRUE,sep="\t")                             
> # opening the above tab separated data file
> plot(flow$USGS1500~as.Date(flow$Date,
> "%m/%d/%y"),type="l",xlab="date",ylab="daily discharge (m3/s)
> ",main="USGS1500",yaxs="i", xaxs="i")                                                      
> #just to test my code, i am trying to make time series   
                                                                                                                                    
#plot of 1 variable USGS1500

http://r.789695.n4.nabble.com/file/n4231737/flow.docx flow.docx 

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