draw.pcf: Prepares the plotting of a 2D or 1D piecewise constant...

In denpro: Visualization of Multivariate Functions, Sets, and Data

Description

Computes x, y, and z arguments for a piecewise constant function, to be used in "persp" or "contour" functions, or the "x" and "y" arguments to be used in "plot".

Usage

draw.pcf(pcf, pnum = rep(32,length(pcf$N)), corona = 5, dens = FALSE, 
minval = 0, drawkern=TRUE)

Arguments

pcf	piecewise constant function; output of "pcf.kern" or "pcf.func"
pnum	vector of 2 positive integers; dimension of the grid where the function will be plotted; not needed in the 1D case
corona	positive integer; gives the number of zeros around the support of the function; the plots look better when there are a corona of zeros around the function
dens	TRUE for densities, used in the 1D case instead of the corona
minval	real number, gives the level of the basis plane of the picture, one takes "minval" typically to be the minimum value of the function (for densities it would be zero)
drawkern	TRUE or FALSE; internal parameter; when one wants to use function "drawkern" for calculation, then one should specify drawkern=TRUE, this can be used in the case that "pcf" is a kernel density estimate

Value

in the 2D case list of vectors "x" and "y" and matrix "z", in the 1D case list of vectors "x" and "y"

Author(s)

Jussi Klemela

See Also

pcf.kern, pcf.func, persp, contour,

Examples

# 2D case
dendat<-sim.data(n=100,type="mulmod")
pcf<-pcf.kern(dendat,h=1,N=c(32,32))

dp<-draw.pcf(pcf,pnum=c(30,30))

contour(dp$x,dp$y,dp$z,drawlabels=FALSE)

persp(dp$x,dp$y,dp$z)

# 1D case
set.seed(1)
dendat<-matrix(rnorm(20),20)   #10*1 data-matrix
pcf<-pcf.kern(dendat,h=1,N=c(25))

dp<-draw.pcf(pcf)

plot(dp$x,dp$y,type="l")

denpro documentation built on May 2, 2019, 8:55 a.m.