shaded.range: Base plotting helper function to draw a shaded polygon

In SwampThingPaul/AnalystHelper: Helper functions developed over the years to extract and format data

Base plotting helper function to draw a shaded polygon

Description

Base plotting helper function to draw a shaded polygon

Usage

shaded.range(x, y.L, y.U, bg, col = bg, lty = 3, col.adj = 0.25, lwd = 1)

Arguments

x	x-value
y.L	lower y-value
y.U	upper y-value
bg	background shading
col	line color
lty	line type
col.adj	factor modifying the opacity alpha. See alpha.f in adjustcolor()
lwd	lines width around polygon

Value

draws polygon based on x, y (upper and lower) values

Note

see polygon() function

Examples

set.seed(456)
y.val=rnorm(100)
x.val=y.val*rnorm(100)
mod=lm(y.val~x.val)
x.pred=seq(min(x.val),max(x.val),max(x.val)/10)
mod.pred=predict(mod, newdata=data.frame(x.val=x.pred),interval="confidence")

plot(y.val~x.val,type="n")
shaded.range(x.pred,mod.pred[,2],mod.pred[,3],"grey")
points(x.val,y.val,pch=19)

SwampThingPaul/AnalystHelper documentation built on March 29, 2024, 6:41 p.m.