Jose Narillos de Santos wrote:
Hi all,
I have a matrix dd with dates and data. i WANT to create a grpah with shade
between the line and the zero axis. I´m trying to use polygon but something
doesn´ t work
Imagine.
I want to plot
g<-read.table("dd.txt", col.names=c("fecha","DP"))
g$fecha <- as.Date(g$fecha, format="%d/%m/%Y")
t<-g$fecha
st<-length(g$DP)
ft<-plot(t,g$DP,type="l",ylab="DP")
polygon(c(1, 1:st, st), c(0, g$USGDP, 0), col = "blue")
abline(h = 0, lwd = 1, col = "black")
If I ommit ploygon line the doc works properly (it plots a graph line).
But I want to colur the area below or over the line and the zero axis.
Can you guide or indicate because in this case polygon doesn´t work.
I attach the two files.
(You need to get your variable names straight: DP, not USGDP)
As you have it, polygon is looking for values 1:28 on the x-axis.
It won't find them:
par('usr')
will tell you what the range of x-values is on the plot.
Change your line to:
polygon(c(t[1],t,t[st]), c(0, g$DP, 0), col = "blue")
This should work (untested).
-Peter Ehlers
Thanks in advance for all.
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