prcomp function

Principle components of stars object

Compute principle components of stars object

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

## S3 method for class '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

Returns

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()