R help - Jan 2010 - Adding a distance scale to a plot?

Do you know what steps I need to take to add a scale to a plot? 

I'm pulling my example out of "An Introduction to R: Software for
StatisticalModelling & Computing" (see the R code around Figure 76).


I would like to add a scale to the image produced by the following code.? I
would like to the scale to list the distance?and units:?

data(volcano)
x <- 10*(1:nrow(volcano))
y <- 10*(1:ncol(volcano))

image(x, y, volcano,col = terrain.colors(100),axes = FALSE)
contour(x, y, volcano, levels = seq(90, 200, by=5),add = TRUE, col =
"peru")
axis(1, at = seq(100, 800, by = 100))
axis(2, at = seq(100, 600, by = 100))
box()
title(main = "Maunga Whau Volcano",font.main = 4)


Thanks for any feedback and insights.

JustADude wrote:
> 
> Do you know what steps I need to take to add a scale to a plot? 
> 
> I'm pulling my example out of "An Introduction to R: Software for
> StatisticalModelling & Computing" (see the R code around Figure
76).
> 
> 
> I would like to add a scale to the image produced by the following code.?
> I would like to the scale to list the distance?and units:?
> 
> data(volcano)
> x <- 10*(1:nrow(volcano))
> y <- 10*(1:ncol(volcano))
> 
> image(x, y, volcano,col = terrain.colors(100),axes = FALSE)
> contour(x, y, volcano, levels = seq(90, 200, by=5),add = TRUE, col >
"peru")
> axis(1, at = seq(100, 800, by = 100))
> axis(2, at = seq(100, 600, by = 100))
> box()
> title(main = "Maunga Whau Volcano",font.main = 4)
> 
> 
> Thanks for any feedback and insights.
> 
> 
> 
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

JustADude,

Take a look at help documentation of spplot() function on the sp package.
This function offer the scale mark on the plot.



-----
..oooO
..................................................................................................
..(....)... 0ooo...                              Walmes Zeviani
...\..(.....(.....)...     Master in Statistics and Agricultural
Experimentation
....\_)..... )../....       walmeszeviani at hotmail.com, Lavras - MG, Brasil
............
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On 01/05/2010 04:12 AM, Jason Rupert wrote:
> Do you know what steps I need to take to add a scale to a plot?
>
> I'm pulling my example out of "An Introduction to R: Software for
StatisticalModelling&  Computing" (see the R code around Figure 76).
>
>
> I would like to add a scale to the image produced by the following code.  I
would like to the scale to list the distance and units:
>    
Hi Jason,
The lengthKey function in the plotrix package might be what you need.

Jim