Dear all R Users:
How can I shade the solution (-Inf,-2) or (2,Inf) of the inequality -x^2+40
within the curve of f(x)=-x^2+4.
and
the solution (-Inf,-2)or(2,Inf) of the inequality x^2-40 within the curve of
f(x)=x^2-4.
with many thanks
abou
==
You should probably say more about which graphics engine you are
using, but here's a start:
curve(x^2-4, from = -3, to = 3)
x - seq(-3, 3, length.out = 200)
polygon(c(x, rev(x)), c(x^2-4, rep(Inf, length(x))), col = 2)
The red is a little oppressive so I'd try to add transparency if
your device
I'm not sure exactly what sort of plot was desired, but I'll offer 1.5
possibilities.
Currently you can do something like this:
require(mosaic)
plotFun( x^2 - 4 ~ x , xlim=c(-6,6), col='blue' )
plotFun( (x^2 - 4)/as.numeric(x^2 -4 0) ~ x , xlim=c(-6,-2),
add=TRUE, col='blue', lwd=4 )
It
The xlim=c(-6,-2) is extraneous in the code below. It snuck in from
something else I was doing. It doesn't hurt any, but it doesn't do
anything either since the plotting limits are inferred from the
surrounding plot when add=TRUE is used.
On Feb 16, 2012, at 10:07 AM, Randall Pruim
Dear all R Users:
How can I shade the solution (-Inf,-2) or (2,Inf) of the inequality -x^2+40
within the curve of -x^2+4=0.
and
the solution (-Inf,-2)or(2,Inf) of the inequality x^2-40 within the curve of
x^2-4=0.
with many thanks
abou
==
AbouEl-Makarim
