[R] 'substitute' question

[Bojanowski, M.J. (Michal)]

I do not understand why you play with 'substitute' instead of something
like this:

# CAUTION: this will work only for bivariate case

# plotmaking function
plotModel <- function(m)
{
	x <- m$model$x
	y <- m$model$y
	r2 <- summary(m)$r.squared
	plot(x,y)
	abline(m)
	text( min(x), max(y), paste("And the R^2 is", round(r2,3)),
pos=4)
	invisible(NULL)
}

# your data
x <- rnorm(100)
y <- x + rnorm(100)
lm1 <- lm(y~x)
# make the plot
plotModel(lm1)



*** Note that my e-mail address has changed to m.j.bojanowski at uu.nl
*** Please update your address books accordingly. Thank you!

_________________________________________
Michal Bojanowski
ICS / Sociology
Utrecht University
Heidelberglaan 2; 3584 CS Utrecht
Room 1428
m.j.bojanowski at uu.nl
http://www.fss.uu.nl/soc/bojanowski
-----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 2:02 PM
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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