[R] adjusting levelplot color scale to data
dwinsemius at comcast.net
Mon Nov 7 06:13:20 CET 2011
On Nov 7, 2011, at 12:10 AM, David Winsemius wrote:
> On Nov 6, 2011, at 10:08 PM, Lanna Jin wrote:
>> Hi guys,
>> I have a matrix with values varying from approximately -0.7 to 0.33
>> that I
>> want to create a heatmap/levelplot with.
>> When I execute the levelplot function for my matrix, I end up
>> getting colors
>> that are adjusted to the max and min rather than around 0. In other
>> ideally I would like to have a color ramp that goes from red
>> number), to white (0), to blue (positive); however, right now the
>> value 0 is
>> in the blue.
>> Any insight on how to address this problem?
> ?levelplot # which leads to"
> ?level.colors # which in turn leads to:
> ? colorRamp
color.palette = colorRampPalette(c("red", "white", "blue"))
> levelplot(as.matrix(dat), at=seq( -.8, .4, length=31),
> col=color.palette(30) )
> And next time, please post the output of dput rather than a mangled
> print() output.
>> Thanks in advance!
>> my matrix "y" looks something like this
>> A B C
>> D E
>> row1 -0.5046406 -0.021579587 -0.4419101 -0.2999195330
>> row2 -0.3070091 -0.059065936 0.3329806 -0.0519335420
>> row3 -0.7271707 0.073282855 -0.3181990 -0.2485017700
>> row4 0.3329806 -0.017762750 -0.1513197 -0.1016354970
>> levelplot(y) yields a color scale from red (-0.8 to 0.2) to blue
>> (0.2 to
>> I'd want the color scale to be from red (-0.8 to 0) to blue (0 to
>> View this message in context: http://r.789695.n4.nabble.com/adjusting-levelplot-color-scale-to-data-tp3997342p3997342.html
>> Sent from the R help mailing list archive at Nabble.com.
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> David Winsemius, MD
> West Hartford, CT
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
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