test.l.max: Find maximum possible wight transformation value.

In EMMAgeo: End-Member Modelling of Grain-Size Data

Find maximum possible wight transformation value.

Description

This function approximates the highest possible value for l in a nested loop. It uses test.l and does not need any further parameters. It starts with l between zero and 0.5 and iteratively approximates the last possible vlaues for which the weight-transformed matrix of the input data still allows eigenspace extraction.

Usage

test.l.max(X, n = 10, ...)

Arguments

X	Numeric matrix, input data set with m samples (rows) and n variables (columns).
n	Numeric scalar, number of loop runs and values per loop.
...	Further arguments passed to the function.

Value

Numeric scalar, maximal possible l value.

Author(s)

Michael Dietze, Elisabeth Dietze

References

Dietze E, Hartmann K, Diekmann B, IJmker J, Lehmkuhl F, Opitz S, Stauch G, Wuennemann B, Borchers A. 2012. An end-member algorithm for deciphering modern detrital processes from lake sediments of Lake Donggi Cona, NE Tibetan Plateau, China. Sedimentary Geology 243-244: 169-180.
Klovan JE, Imbrie J. 1971. An Algorithm and FORTRAN-IV Program for Large-Scale Q-Mode Factor Analysis and Calculation of Factor Scores. Mathematical Geology 3: 61-77.

See Also

EMMA, test.l

Examples

## load example data set
data(example_X)

## create weight transformation limits vector
l <- seq(from = 0, to = 0.6, by = 0.05)

## test l.max (uncomment to run, may take more than 10 sec to run)
# l.max <- test.l.max(X = X)

EMMAgeo documentation built on April 3, 2025, 10:24 p.m.