On Feb 22, 2011, at 7:10 PM, Ista Zahn wrote:
Hi,
This is R, so there are bound to be severay ways to do it. This would
be my first choice:
library(ggplot2)
ggplot(d, aes(x=V2, y=V3, color=V1)) + geom_step()
Best,
Ista
On Tue, Feb 22, 2011 at 3:08 PM, Techni X <fiboswo...@yahoo.com>
wrote:
Hi all,
I have a question, that might be a „rookie“ question – but I’m
trying now for days and cannot get my head around. The general
question is:
How can I plot a stepped line chart with multiple lines from a
subset of a dataframe?
An example:
d <- matrix(rep(0,24), ncol=3, nrow=8)
d <- as.data.frame(d)
d$V1 <- c("A","A","A","B","B","C","C","C")
d$V2 <- c(5,10,15,10,15,5,13,15)
d$V3 <- c(10,20,30,7.5,10,3,7,10)
Probably the second to these:
require(lattice)
xyplot(V3 ~ V2|V1, data=d, type="s") #separate panels
xyplot(V3 ~ V2, group=V1, data=d, type="s") # all on one panel
which gives me the following dataframe:
V1 V2 V3
1 A 5 10.0
2 A 10 20.0
3 A 15 30.0
4 B 10 7.5
5 B 15 10.0
6 C 5 3.0
7 C 13 7.0
8 C 15 10.0
I now want to plot three stepped lines into a x-y chart, the lines
representing A, B, C. The x-axis is given by V2, the y-axis by V3,
thus each line will be “ascending”
It must be something with SUBSET or so, but I do not find an easy
way.
Can anybody help me?
Thanks
Stephan
David Winsemius, MD
West Hartford, CT
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