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which

Which cells are TRUE?


Description

Which returns a RasterLayer with TRUE or FALSE setting cells that are NA to FALSE (unless na.rm=FALSE). If the RasterLayer has numbers, all values that are 0 become FALSE and all other values become TRUE. The function can also return the cell numbers that are TRUE

Usage

## S4 method for signature 'RasterLayer'
Which(x, cells=FALSE, na.rm=TRUE, ...)

Arguments

x

RasterLayer

cells

logical. If TRUE, cell numbers are returned, otherwise a RasterLayer is returned

na.rm

logical. If TRUE, NA values are treated as FALSE, otherwise they remain NA (only when cells=FALSE)

...

Additional arguments (none implemented)

Value

RasterLayer

See Also

Examples

r <- raster(ncol=10, nrow=10)
set.seed(0)
values(r) <- runif(ncell(r))
r[r < 0.2 ] <- 0
r[r > 0.8] <- 1
r[r > 0 & r < 1 ] <- 0.5

Which(r, cells=TRUE)
Which(r > 0.5, cells=TRUE)

s1 <- r > 0.5
s2 <- Which(r > 0.5)
s1[1:15]
s2[1:15]

# this expression
x1 <- Which(r, na.rm=FALSE)
# is the inverse of
x2 <- r==0

raster

Geographic Data Analysis and Modeling

v3.4-10
GPL (>= 3)
Authors
Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Jacob van Etten [ctb], Michael Sumner [ctb], Joe Cheng [ctb], Dan Baston [ctb], Andrew Bevan [ctb], Roger Bivand [ctb], Lorenzo Busetto [ctb], Mort Canty [ctb], Ben Fasoli [ctb], David Forrest [ctb], Aniruddha Ghosh [ctb], Duncan Golicher [ctb], Josh Gray [ctb], Jonathan A. Greenberg [ctb], Paul Hiemstra [ctb], Kassel Hingee [ctb], Institute for Mathematics Applied Geosciences [cph], Charles Karney [ctb], Matteo Mattiuzzi [ctb], Steven Mosher [ctb], Babak Naimi [ctb], Jakub Nowosad [ctb], Edzer Pebesma [ctb], Oscar Perpinan Lamigueiro [ctb], Etienne B. Racine [ctb], Barry Rowlingson [ctb], Ashton Shortridge [ctb], Bill Venables [ctb], Rafael Wueest [ctb]
Initial release
2021-05-02

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