[R-sig-Geo] pixel-wsie correlation between raster stack and numeric vector?

[Robert J. Hijmans]

MIke, I think you can use the 'calc' function for that:

library(raster)
# example data
set.seed(0)
s <- stack(system.file("external/rlogo.grd", package="raster"))
s <- stack(s, s[[1]]*runif(ncell(s)), s[[2]]*runif(ncell(s))/10,
s[[3]]*runif(ncell(s))+10)

# example vector
v <- 1:6

x <- calc(s, fun=function(x) cor(x, v))
plot(x)

Robert


On Mon, Feb 23, 2015 at 1:14 PM, Mike Loranty <mloranty at colgate.edu> wrote:
> Hi All,
>
> Is there a way (e.g. existing function) to calculate correlation
> coefficients between a raster stack and a numeric vector? For example,
> between gridded vegetation indices and a vector of atmospheric oscillation
> indices (e.g. ENSO, NAO, etc...).
>
> Thanks,
> Michael Loranty
> Assistant Professor
> Department of Geography
> Colgate University
> 315.228.6057
> mloranty at colgate.edu
> http://mikeloranty.wordpress.com/
>
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>
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