four_feature_dat: Point cloud of four features; square, circle, equilateral and...

In pterrace: Persistence Terrace for Topological Data Analysis

Description

A dataset containing 2,400 points of four features on the two-dimensional space: 400 points from a a square, 800 points from a circle and 1,200 points from two triangles.

Usage

data(four_feature_dat)

Format

A matrix of 2,400 rows and 2 columns

Examples

# load four feature dat
data(four_feature_dat)

# input variables
Xlim <- c(-7,5)
Ylim <- c(-5,6)
lim <- cbind(Xlim, Ylim)
by <- 0.2
spseq <- seq(0.01,0.6,length.out = 10)

# compute barcodes
four_feature_pt <- computept(four_feature_dat,sp=spseq,lim=lim,by=by)

## Not run: 
# compute persistence terrace with parallel option
spseq <- seq(0.01,0.6,length.out = 30)
two_circle_density_pt <- computept(four_feature_dat,sp=spseq,lim=lim,by=by,par=TRUE)

## End(Not run)

## draw area plot
terracearea(four_feature_pt,dimension=1,maxheight=20)
## draw persistence terrace
plotpt(four_feature_pt,cmax=6,dimension=1)

pterrace documentation built on May 2, 2019, 10:08 a.m.