Dear all,
I have a data.frame xy which I am plotting like in the code below (provided is
a small data sample with dummy data that should work).
Is there a way how I could convert my xx and yy in the xy plot to a points
command so that I could set type='n' and add points afterwards in order to
control it better?
In the end what I am also aiming for is a fixed x-axis range (e.g. from 1940 to
2014) and if values before 1940 are present the x axis should be automatic. The
y axis should always be in the range of the values generated for each plot.
Thank you for your help!
Kind regards,
Kurt
###########################
Here is my code with sample data:
# read in sample data
xy <-
data.frame(NAME=c("NAME1","NAME1","NAME1","NAME2","NAME2","NAME2"),ID=c(87,87,87,199,199,199),
X_START_YEAR=c(1984,1986,1984,1899,1909,1924),Y_START_VALUE=c(75,25,-90,-8,-55,-10),X_END_YEAR=c(1986,1994,1999,1909,1924,1927),
Y_END_VALUE=c(20,50,-15,-70,-80,-100))
# split data.frame into groups (defined by ID in this case)
ind <- split(xy,xy$ID)
# plot data by group
for (x in ind){
xx = unlist(x[,grep('X_',colnames(x))])
yy = unlist(x[,grep('Y_',colnames(x))])
fname <- paste0(x[1, 'ID'], '.png')
png(fname, width=1679, height=1165, res=150)
par(mar=c(6,8,6,5))
plot(xx,
yy,
main=unique(x[,1]),
xlab="Time [Years]",
ylab="Value [m]")
axis(1, at = seq(1000, 2050, 5), cex.axis=1, labels=FALSE, tcl=-0.3)
axis(2, at = seq(-100000, 100000, 500), cex.axis=1, labels=FALSE, tcl=-0.3)
x <- x[,-1]
segments(x[,2],x[,3],x[,4],x[,5],lwd=2)
dev.off()
}
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