raster (version 1.8-3)

Math-methods: Mathematical functions

Description

Generic mathematical functions that can be used with a Raster* object as argument: "abs", "sign", "sqrt", "ceiling", "floor", "trunc", "cummax", "cummin", "cumprod", "cumsum", "log", "log10", "log2", "log1p", "acos", "acosh", "asin", "asinh", "atan", "atanh", "exp", "expm1", "cos", "cosh", "sin", "sinh", "tan", "tanh".

Note

If the values of the output Raster* object cannot be held in memory, they will be saved to a temporary file. If you want to set the filename (and perhaps format and datatype), use calc instead of the Math-methods.

See Also

Arith-methods, calc, overlay, atan2

Examples

r1 <- raster(nrow=10, ncol=10)
r1 <- (setValues(r1, runif(ncell(r1)))) * 10
r2 <- sqrt(r1)
s <- stack(r1, r2) - 5
b <- abs(s)