Get a unique value range of a rasterlayer - r

Question

My rasterlayer has a range from 0 to 1. I just want the Pixel values from 0.2 to 0.1
I tried this Code:
R<- myraster
R[(R<=0.1) & (R>=0.2)] <- NA
This is my idea for a range of value.
For a single value I don't know.
If I use this code I get online NA or the range from.0 to 1 does not change.
Is my Code wrong or is there another option?
I also used this one only to get the value 0.1
R<- myraster
R[(R<=0.1) & (R>=0.1)] <- NA

Answer 1

You can do it in two steps. For instance,
library(raster)
# Simulate raster
R <- raster(ncol=10, nrow=10)
values(R) <- runif(ncell(R))
#Subset the raster in two steps
R[R >= 0.2] <- NA
R[R <= 0.1] <- NA
R
Here's the output...
> R <- raster(ncol=10, nrow=10)
> values(R) <- runif(ncell(R))
> R
class : RasterLayer
dimensions : 10, 10, 100 (nrow, ncol, ncell)
resolution : 36, 18 (x, y)
extent : -180, 180, -90, 90 (xmin, xmax, ymin, ymax)
crs : +proj=longlat +datum=WGS84 +no_defs
source : memory
names : layer
values : 0.01307758, 0.9926841 (min, max)
> R[R>=0.2]<-NA
> R[R<=0.1 ]<-NA
> R
class : RasterLayer
dimensions : 10, 10, 100 (nrow, ncol, ncell)
resolution : 36, 18 (x, y)
extent : -180, 180, -90, 90 (xmin, xmax, ymin, ymax)
crs : +proj=longlat +datum=WGS84 +no_defs
source : memory
names : layer
values : 0.1008731, 0.1912601 (min, max)