overlay points on plot
Checking the documentation on lists: help.start() -> "An
Introduction to R" -> "Lists and data frames" -> ... "It is very
important to distinguish Lst[[1]] from Lst[1]. [[...]] is the operator
used to select a single element, whereas [...] is a general subscripting
operator. Thus the former is the first object in the list Lst, and if it
is a named list the name is not included. The latter is a sublist of the
list Lst consisting of the first entry only. If it is a named list, the
name is transferred to the sublist."
hope this helps. spencer graves
femke wrote:
Brilliant! Why the double brackets though? thanks femke ----- Original Message ----- From: <james.holtman at convergys.com> To: "femke" <femke at geog.umd.edu> Sent: Wednesday, February 18, 2004 1:58 PM Subject: Re: [R] overlay points on plot
have you tried: points(v[[2]],v[[3]])
__________________________________________________________
James Holtman "What is the problem you are trying to solve?"
Executive Consultant -- Office of Technology, Convergys
james.holtman at convergys.com
+1 (513) 723-2929
"femke"
<femke at geog.umd.edu> To:
<r-help at stat.math.ethz.ch>
Sent by: cc:
r-help-bounces at stat.m Subject: [R] overlay
points on plot
ath.ethz.ch
02/18/2004 13:03
Dear R-help list,
I'm trying to overlay a number of data objects in a plot. Following an
earlier example on the list I've created an empty plot as follows
xlim <- range(as.numeric(c("0","10000")))
ylim <- range(as.numeric(c("0","25")) )
plot(NA, xlim=xlim, ylim=ylim, xlab="distance", ylab="semivariance")
However when I try to plot something on it, I get the following error:
points(v[2],v[3])
Error in as.double.default(x) : (list) object cannot be coerced to double
A sample of my data looks like the following V[2]:
gamma
1 0.040000
2 0.582500
3 1.574545
4 7.126500
.....
and V[3]:
dist
1 470.0426
2 1045.6365
3 1607.1936
....
Does anyone have any idea how to fix this?
Thanks very much,
femke
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