[R] Adding text to multiple plots

[ksaw]

Dear R-helpers,

I am trying to add an information about the mean value for each variable
within each plot by adding text to the multiple plots in this way:

par(mfrow=c(2,2))
df$Date <- as.Date(df$Date, format="%d/%m/%Y")

for (i in 2:5){ 
	plot(df$Date, df[[i]])
	Mean <- mean(na.omit(df[[i]]))
	text(x=max(na.omit(df[[i]])), labels=paste("Mean = ", Mean, sep=""))
	}

where df is an example table:
Date	A	B	C	D
01/12/2008	3	6	3	6
14/12/2008	4	7	4	7
27/12/2008	4	5	65	8
09/01/2009	5	5	7	6
22/01/2009	23	4	8	6
04/02/2009	2	3	5	2
17/02/2009	4	65	4	2
02/03/2009	5	6	3	2
15/03/2009	5	7	3	5
28/03/2009	6	7	2	5
10/04/2009	78	5	2	6
23/04/2009	3	3	1	NA
06/05/2009	4	3	4	6

It does work if the Date is not in a date format. When changing the Date
format into date there is no output from text within a loop. Is there a way
to keep the date format as.Date and be able to print the information about
the mean on each plot?

Many thanks
Kasia

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