I have a Formal Class Raster and I am trying to apply the boot::inv.logit() function to its raster cells, for example:
r1 <- raster(nrows=25, ncols=25, vals=rtnorm(n = 625, .1, .9))
r2 <- boot::inv.logit(r1)
However, when I try that, it retruns an error:
> Error in plogis(x) : Non-numeric argument to mathematical function
If I turn the raster into a matrix, and then back to raster, it gets the job done, but I loose all the other info associated with the "Formal Class Raster" I had at the beginning, which is not ideal:
r2 <- boot::inv.logit(as.matrix(r1))
r2 <- as.raster(r2)
Is there an easy way to either recover the Formal Class Raster info I had before or apply the inv.logit() to the raster without the as.matrix() transformation? Thank you in advance.
If you want to apply the function to the raster, use the calc method from raster:
r2 <- calc(r1,boot::inv.logit)
> r2
# class : RasterLayer
# dimensions : 25, 25, 625 (nrow, ncol, ncell)
# resolution : 14.4, 7.2 (x, y)
# extent : -180, 180, -90, 90 (xmin, xmax, ymin, ymax)
# coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
# data source : in memory
# names : layer
# values : 0.07434905, 0.9498965 (min, max)
Alternatively, you can make an empty copy of r1, and just fill in the values coming out of inv.logit:
r2 <- raster(r1)
r2[] <- boot::inv.logit(as.matrix(r1))