SignedLog function

Signed Log

Computes the Signed Log if Data

SignedLog(Data,Base="Ten")

Arguments

• Data: [1:n,1:d] Data matrix with n cases and d variables
• Base: Either "Ten", "Two", "Zero", or any number.

Details

A neat transformation for data, it it has a better representation on the log scale.

Returns

Transformed Data

References

Prof. Dr. habil. A. Ultsch, Lectures in Knowledge Discovery, 2014.

Author(s)

Michael Thrun

Note

Number Selections for Base for 2,10, "Two" or "Ten" add 1 to every datapoint as defined in the lectures.

See Also

log

Examples

# sampling is done
# because otherwise the example takes too long
# in the CRAN check
data('ITS')
ind=sample(length(ITS),1000)

MDplot(SignedLog(cbind(ITS[ind],MTY[ind])*(-1),Base = "Ten"))