library(NMF) # other packages are welcome
car<-as.matrix(cars)
car[car<18]<-0
car[car>=18]<-1
aheatmap(car)
I would like to see only two colors in the legend: the 0 represents blue and 1 represents red.
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The number of breaks in the legend can be changed [see documentation](http://nmf.r-forge.r-project.org/aheatmap.html): `aheatmap(car,color = "-RdYlBu2:1")`. However you will still have the graduation – Mitra Apr 12 '16 at 16:36
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Yes, it works better in your way, but the sill the graduation exits. Thanks all the same. – Ming Apr 12 '16 at 17:37
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What about changing the red-blue style to yellow-red style? – Ming Apr 12 '16 at 18:55
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[Please refer to the documentation](http://nmf.r-forge.r-project.org/aheatmap.html) __When the coluor palette is specified with a single value, and is negative or preceded a minus ('-'), the reversed palette is used. The number of breaks can also be specified after a colon (':'). For example, the default colour palette is specified as '-RdYlBu2:100'.__ so in your case, you can use the yellow-red palette from RColorBrewer: `aheatmap(car,color = "-YlOrRd:1")` – Mitra Apr 13 '16 at 10:38