msr (version 0.4.4)

msc.sublevels: Extract levels from Morse Smale Complex

Description

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.

Usage

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

Arguments

ms

Morse-Smale complex object

startLevel

First Level to include in the new hierarchy

endLevel

Last level to include in the new hierarchy

Value

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

References

[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.

Examples

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)