[英]How to set certain values to specific colour in R?
I have one matrix r (raster). 我有一个矩阵r(栅格)。 I would like to plot r , this simply can be done using
我想绘制r,这可以简单地使用
plot (r)
But I would like to mark all values of 20 (so this value will not be taken into account in the scale of legend) to red colour and plot r
normally as below. 但是我想将所有值20标记为红色(因此在图例比例中将不考虑该值),将其标记为红色,并正常绘制
r
如下所示。 a reproducible example: 一个可重现的例子:
library(raster)
r <- raster(nrows=10, ncols=10)
r <- setValues(r, 1:ncell(r))
plot(r)
This will produce this: 这将产生以下结果:
elegant is different but is this what you intend to do? 优雅与众不同,但这是您打算做什么?
par(mfrow=c(2,2))
plot(r)
r.20 <- calc(r, fun=function(x){ x[x == 20] <- NA; return(x)} )
as.matrix(r.20)
plot(r.20)
r.not20 <- calc(r, fun=function(x){ x[x != 20] <- NA; return(x)} )
plot(r.not20, col="red")
plot(r.20);
par(new=TRUE)
plot(r.not20, col="red", legend=FALSE)
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