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overlay points on plot
4 messages · femke, Brian Ripley, Tom Blackwell +1 more
Is v a data frame? In that case you need v[[2]] and v[[3]], as v[2] is a data frame.
On Wed, 18 Feb 2004, femke wrote:
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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______________________________________________ R-help at stat.math.ethz.ch mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
The solution is found in help("Subscript").
The subscripting you show inside the function points()
returns a data frame of one column. This is indeed a
list and not a vector. There are several ways to subscript
a data frame that will return one column as a vector.
If you use one of them, this should all work.
The 40 page document "An Introduction to R" may also be
helpful. In other words, this is pretty thoroughly covered
in the documentation.
- tom blackwell - u michigan medical school - ann arbor -
On Wed, 18 Feb 2004, femke wrote:
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
[[alternative HTML version deleted]]
______________________________________________ R-help at stat.math.ethz.ch mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
What do you get from the following:
class(v)
class(v[2])
If class(v) is "list", then class(v[2]) will also be "list". In
that case try the following:
points(v[[2]],v[[3]])
hope this helps. spencer graves
femke wrote:
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
[[alternative HTML version deleted]]
______________________________________________ R-help at stat.math.ethz.ch mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html