[R] 'substitute' question

[Mendiburu, Felipe (CIP)]

Dear Renko

To modify the script

plot(x,y)
r2<-summary(lm1)$r.squared*100
# label
R2text <- substitute(paste(R^2," = ",r2),list(r2=r2))
text(-1,1,R2text, col="red") # To see of the coordinates of the graph.

Grettings

Felipe

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of remko duursma
Sent: Tuesday, March 13, 2007 8:02 AM
To: r-help at stat.math.ethz.ch
Subject: [R] 'substitute' question



# I use this code to label a graph with the R2:

# graph
x <- rnorm(100)
y <- x + rnorm(100)
lm1 <- lm(y~x)
plot(x,y)

# label
R2text <- substitute(paste(R^2," = ",r2),list(r2=r2))
text(1,-3,R2text, col="red")

# i have modified this a bit, so that i have a vector with other labels, 
each of which
# will be labelled on the graph. Example:
texts <- c("And the R2 is", R2text)
x <- c(-2,-2)
y <- c(2,1)
for(i in 1:length(texts))text(x[i],y[i],texts[i],pos=4, col="blue")

# As you can see the label "R2 = 48.7" remains at "paste(R^2, " = ", 48.7)"
# What to do?



Thanks for your help,

Remko



..-~-.-~-.-~-.-~-.-~-.-~-.-~-.-~-.-~-
Remko Duursma
Post-doctoral researcher
Dept. Forest Ecology
University of Helsinki, Finland

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