Dear Jonathan,
Function get.snow() is not vectorized, i.e. it does not return a vector
of the same length as its input. According to the help of app(), "The
function should return a vector or matrix that is divisible by ncell(x).".
HTH,
Ákos Bede-Fazekas
Centre for Ecological Research
Hungary
2022.09.29. 5:27 keltezéssel, Thayn, Jonathan írta:
I keep getting the following message when using terra:app –– Error: [app] the
number of values returned by 'fun' is not appropriate. I can’t figure out what
I’m doing wrong. A sample code is below:
library(terra)
the.raster <- rast(ncol=4,nrow=4)
the.raster[] <- sample(0:65535,16)
get.snow <- function(j){
k <- as.numeric(intToBits(j)[10:11])
m <- k%*%1:2
return(m)
}
new.raster <- app(the.raster,get.snow)
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