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Principle components of stars object

Source: R/prcomp.R
prcomp.Rd

Compute principle components of stars object

Usage

# S3 method for stars_proxy
prcomp(x, ..., downsample = 0)

# S3 method for stars
prcomp(x, ..., quiet = FALSE)

Arguments

x

object of class `stars` or `stars_proxy`

...

see prcomp

downsample

see st_as_stars

quiet

logical; if `TRUE`, suppress message that PCs will be computed on last dimension; see details

Value

object of class `prcomp`, see prcomp

Details

if `x` has only one attribute, principle components will be computed in the space of the last dimension of `x` to predict PC scores into a `stars` object, use predict.stars; see example below

Examples

l7 = split(st_as_stars(L7_ETMs), 3) # use bands as features
l7 |> prcomp() |> plot()

l7 |> prcomp() |> predict(l7, model = _) |> merge() |> plot()
#> downsample set to 1