Threshold a numeric array or vector

This function thresholds an array or vector, setting elements below the threshold value to zero. The threshold can be given literally or calculated using k-means clustering.

threshold(x, level, method = c("literal", "kmeans"), binarise = TRUE)

Arguments

x	A numeric vector or array.
level	The literal threshold level, if required.
method	The method to use to calculate the threshold. If "literal" (the default) then the value of level will be used. If "kmeans" then the threshold value will be determined implicitly using k-means clustering.
binarise	Whether to set suprathreshold elements to unity (if TRUE), or leave them at their original values (if FALSE).

See also

binarise

Author

Jon Clayden <code@clayden.org>

Examples

x <- c(0.1, 0.05, 0.95, 0.85, 0.15, 0.9)
threshold(x, method="kmeans")
#> [1] 0 0 1 1 0 1
threshold(x, 0.5)
#> [1] 0 0 1 1 0 1