R help - Jan 2012 - Adding text to multiple plots

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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On Jan 24, 2012, at 8:12 AM, ksaw wrote:
> 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.
Most likely because the plot is being constructed with dates as the x- 
value and your `text` call has the x's as what you are considering to  
be the y-values.

> 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
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Adding-text-to-multiple-plots-tp4323717p4323717.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT