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For Raster* objects x and y, atan2(y, x) returns the angle in radians for the tangent y/x, handling the case when x is zero. See Trig
Trig
See Math-methods for other trigonometric and mathematical functions that can be used with Raster* objects.
Math-methods
atan2(y, x)
Raster* object
# NOT RUN { r1 <- r2 <- raster(nrow=10, ncol=10) values(r1) <- (runif(ncell(r1))-0.5) * 10 values(r2) <- (runif(ncell(r1))-0.5) * 10 atan2(r1, r2) # }
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