Math-methods | R Documentation |
Standard mathematical methods for computations with SpatRasters. Computations are local (applied on a cell by cell basis). If multiple SpatRasters are used, these must have the same extent and resolution. These have been implemented:
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, round, signif
Instead of directly calling these methods, you can also provide their name to the math
method. This is useful if you want to provide an output filename.
The following methods have been implemented for SpatExtent
: round, floor, ceiling
round
has also been implemented for SpatVector
, to round the coordinates of the geometries.
## S4 method for signature 'SpatRaster'
sqrt(x)
## S4 method for signature 'SpatRaster'
log(x, base=exp(1))
## S4 method for signature 'SpatRaster'
round(x, digits=0)
## S4 method for signature 'SpatRaster'
math(x, fun, digits=0, filename="", overwrite=FALSE, ...)
## S4 method for signature 'SpatVector'
round(x, digits=4)
## S4 method for signature 'SpatRaster'
cumsum(x)
x |
SpatRaster |
base |
a positive or complex number: the base with respect to which logarithms are computed |
digits |
Number of digits for rounding |
fun |
character. Math function name |
filename |
character. Output filename |
overwrite |
logical. If |
... |
additional arguments for writing files as in |
SpatRaster or SpatExtent
See app
to use mathematical functions not implemented by the package, and Arith-methods
for arithmetical operations. Use roll
for rolling functions.
r1 <- rast(ncols=10, nrows=10)
v <- runif(ncell(r1))
v[10:20] <- NA
values(r1) <- v
r2 <- rast(r1)
values(r2) <- 1:ncell(r2) / ncell(r2)
r <- c(r1, r2)
s <- sqrt(r)
# same as
math(r, "sqrt")
round(s, 1)
cumsum(r)
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