The figure is not ok. The coordinate of the normal curve is not the same
as that of the circle. In fact, there are only four intersections other
than eight that your figure show.
Best,
Jinsong
On 2022/10/23 3:05, L... L... wrote:
Dear, I have a picture in which I draw a circle over the standard normal curve.
See below the lines used to draw the figure. The figure is ok, but my problem
is: How to shade the areas A, B, C, D, E and F? I know I have to find the
points of intersection but I don't know how to find them. Suggestions will be
welcome.
library(plotrix)
x <- seq(-3.0, 3.0, 0.01)
fy <- dnorm(x)
fy <- fy / max(fy)
x11()
plot(x, fy, ylim = c(-1, 1), col = "white", lwd = 1.5, xlim = c(-3, 3), lty = 1)
draw.circle(0.0, 0.0, 2.00, border = 'blue', lty = 1, lwd = 0.8)
lines(x, fy, type = 'l', ylim = c(-1,1), col = 'red', )
lines(x,-fy, type = 'l', ylim = c(-1,1), col = 'red')
text( 0.0, 0.90, "A"); text( 0.0,-0.90, "B")
text(-1.8, 0.25, "C"); text( 1.8, 0.25, "D")
text(-1.8,-0.25, "E"); text( 1.8,-0.25, "F")
Best regards
ML
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