I need to have the maths symbol for >= in the legend, and to
substitute threshold variable with its value. Somehow, various
attempts weren't successful. Please help.
threshold <- 0.5
plot(NA, xlab="", ylab="", main="", axes=F, xlim=c(0,1), ylim=c(0,1),
xaxs="i", yaxs="i")
legend(x=0, y=1, fill=c("orange", "white", "green", "gray90"),
cex=0.8, pt.cex=1.8, x.intersp=0.6, bg = "white",
legend=c(expression("Up (" >= threshold ")"), "Normal",
"Down", "NA"), bty = "n")
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