adjusting levelplot color scale to data
Hi,
Try specifying explicit break points together with their corresponding
colors using at and col.regions,
levelplot(m, at= unique(c(seq(-2, 0, length=100), seq(0, 10,
length=100))), col.regions = colorRampPalette(c("blue", "white",
"red"))(1e3))
HTH,
baptiste
On 7 November 2011 16:08, Lanna Jin <lannajin at gmail.com> 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 words, ideally I would like to have a color ramp that goes from red (negative 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? Thanks in advance! example... my matrix "y" looks something like this ? ? ? ? ? ? ? ? A ? ? ? ? ? ? ? ? B ? ? ? ? ? ? ? ? ? ? ?C D ? ? ? ? ? ? ? ? ? ?E ?row1 ? ? ? ? -0.5046406 -0.021579587 ? ?-0.4419101 -0.2999195330 -0.4845047 ?row2 ? ? ? ? -0.3070091 -0.059065936 ? ? 0.3329806 -0.0519335420 -0.5766368 ?row3 ? ? ? ? -0.7271707 ?0.073282855 ? ?-0.3181990 -0.2485017700 -0.5732781 ?row4 ? ? ? ? ?0.3329806 -0.017762750 ? ?-0.1513197 -0.1016354970 0.2528442 levelplot(y) yields a color scale from red (-0.8 to 0.2) to blue (0.2 to 0.4) I'd want the color scale to be from red (-0.8 to 0) to blue (0 to 0.4) ----- Lanna -- 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.
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