[R] Any alternatives to draw.colorkey from lattice package?

[Mikhail Titov]

Felix:

Thank you! Perhaps I should read documentation more careful as I missed
that another `at`.
lattice & latticeExtra are so marvelous so I hardly want to use anything
else.

Mikhail

On 08/13/2011 07:31 AM, Felix Andrews wrote:
> You can just specify the label positions, you don't need to give
> labels for every color change point:
> (there is an 'at' for the color changes and a 'labels$at' for the labels)
>
> levelplot(rnorm(100) ~ x * y, expand.grid(x = 1:10, y = 1:10),
>     colorkey = list(at = seq(-3,3,length=100),
>         labels = list(labels = paste(-3:3, "units"), at = -3:3)))
>
>
>
> On 13 August 2011 19:59, Jim Lemon <jim at bitwrit.com.au> wrote:
>> On 08/13/2011 04:34 AM, Mikhail Titov wrote:
>>> Hello!
>>>
>>> I’d like to have a continuous color bar on my lattice xyplot with colors
>>> lets say from topo.colors such that it has ticks&  labels at few specific
>>> points only.
>>>
>>> Right now I use do.breaks&  level.colors with somewhat large number of
>>> steps. The problem is that color change point doesn’t necessary correspond
>>> to the value I’d like to label. Since I have many color steps and I don’t
>>> need high precision I generate labels like this
>>>
>>> labels<- ifelse( sapply(at,function(x) any(abs(att-x)<.03)) ,
>>> sprintf("depth= %s ft", at), "")
>>>
>>> , where `att` has mine points of interest on color scale bar and `at`
>>> corresponds to color change points used with level.colors . It is a bit
>>> inconvenient as I have to adjust threshold `.03`, number of color steps so
>>> that it labels only adjacent color change point with my labels.
>>>
>>> Q: Are there any ready to use functions that would generate some kind of
>>> GRaphical OBject with continuous color scale bar/key with custom at/labels
>>> such that it would work with `legend` argument of xyplot from lattice?
>>>
>> Hi Mikhail,
>> I think that color.legend in the plotrix package will do what you are
>> asking, but it is in base graphics, and may not work with lattice.
>>
>> Jim
>>
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>
>