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Compute the spatial sign (a projection of a data vector to a unit length
circle). The spatial sign of a vector w
is w /norm(w)
.
spatialSign(x)
an object full of numeric data (which should probably be scaled). Factors are not allowed. This could be a vector, matrix or data frame.
A vector, matrix or data frame with the same dim names of the original data.
Serneels et al. Spatial sign preprocessing: a simple way to impart moderate robustness to multivariate estimators. J. Chem. Inf. Model (2006) vol. 46 (3) pp. 1402-1409
# NOT RUN {
spatialSign(rnorm(5))
spatialSign(matrix(rnorm(12), ncol = 3))
# should fail since the fifth column is a factor
try(spatialSign(iris), silent = TRUE)
spatialSign(iris[,-5])
trellis.par.set(caretTheme())
featurePlot(iris[,-5], iris[,5], "pairs")
featurePlot(spatialSign(scale(iris[,-5])), iris[,5], "pairs")
# }
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