reltext: Add text using relative x,y plot coordinates

In marchtaylor/sinkr: Collection of functions with emphasis on multivariate data analysis

Add text using relative x,y plot coordinates

Description

reltext adds text using relative x,y plot coordinates. Wrapper for text.

Usage

reltext(relx = 0.5, rely = 0.5, labels = seq_along(relx), ...)

Arguments

relx, rely	numeric vectors of coordinates where the text labels should be written.
labels	label argument passed to text
...	other parameters passed to text

Examples

# Make data
set.seed(1)
n <- 100
a <- 3
b <- 5
x <- rnorm(n, mean = 10)
y <- a + b*x + rnorm(n, sd=2)
fit <- lm(y ~ x)

# Plot with regression results in top left corner
op <- par(mar=c(3,3,0.5,0.5), mgp=c(1.5,0.5,0), tcl=-0.25, las=1, bty="l")
plot(x, y)
abline(fit, lty=2, col=4)
reltext(0, 0.95, pos=4, col=4,
   labels=bquote( italic(y) == .(sprintf("%0.2f", (coef(fit)[1])))+
     .(sprintf("%0.2f", (coef(fit)[2])))~"*"~italic(x) 
   )
)
reltext(0, 0.85, pos=4, col=4,
        labels=bquote( bolditalic(R)^2 == .(round(summary(fit)$adj.r.squared,2)) )
)
par(op)

# Plot multiple labels at once
plot(x, y)
abline(fit, lty=2, col=8)
reltext(c(0,0.95), c(0.95, 0.05), pos=c(4,3), col=c(3,4), labels=c("text1", "text2"))


# plot when axes are log-scaled
plot(x, y, log = "xy")
reltext(c(0,0.95), c(0.95, 0.05), pos=c(4,3), col=c(3,4), labels=c("text1", "text2"))

marchtaylor/sinkr documentation built on June 15, 2025, 1:17 a.m.