msc.sublevels: Extract levels from Morse Smale Complex
In msr: Morse-Smale Approximation, Regression and Visualization

Description Usage Arguments Value Author(s) References Examples

View source: R/msc.nn.R

Extract a subset of the levels of the current hierarchical levels of the Morse-Smale complex. This is usefull to save computational time for example for building regression models for only a single or smaller range sof persistence level of the Morse-Samle hierarchy.

1	msc.sublevels(ms, startLevel = ms$predictLevel, endLevel = startLevel)

`ms`	Morse-Smale complex object
`startLevel`	First Level to include in the new hierarchy
`endLevel`	Last level to include in the new hierarchy

An object of class msc with hierarchy levels from startLevel to endLevel of the input Morse-Smale object.

Samuel Gerber

[1] Samuel Gerber and Kristin Potter The Morse-Smale Complex for Data Analysis, Journal of Statistical Software, 2012, vol. 50, no. 2, pp 1-22

[2] Samuel Gerber, Oliver Ruebel Peer-Timo Bremer, Valerio Pascucci, Ross Whitaker, Morse-Smale Regression, Journal of Computational and Graphical Statistics, 2012

[3] Samuel Gerber, Peer-Timo Bremer, Valerio Pascucci, Ross Whitaker, Visual Exploration of High Dimensional Scalar Functions, IEEE Transactions on Visualization and Computer Graphics, vol. 16, no. 6, pp 1271-1280, Nov.-Dec. 2010.

data(fourpeaks)
d <- fourpeaks()

#build Morse-Smale complex of m
ms <- msc.nn(y=d[, 1], x=d[, 2:3], nLevels = 15, knn = 15)

#extract levels 9 through 14
ms <- msc.sublevels(ms, 9, 14)