plotFEM.fd {SpatialfdaR}

Plots an FEM functional data object.

Description

Plots a FEM object fdobj over a rectangular grid defined by vectors Xgrid and Ygrid.

Usage

  plotFEM.fd(fdobj, Xgrid=NULL, Ygrid=NULL, nderivs=rep(0,2), 
                      xlab="X", ylab="Y", zlab="Z", main="",
                      ticktype="detailed", r=10, phi=15, theta=30)

Arguments

fdobj

A surface defined by a finite element FEM basis.

Xgrid

A vector of X coordinate values.

Ygrid

A vector of Y coordinate values.

nderivs

A vector of length 2 indicating order of partial derivatives.

xlab

A character vector for labelling the X-axis when using function persp.

ylab

A character vector for labelling the Y-axis when using function persp.

zlab

A character vector for labelling the Z-axis when using function persp.

main

A character vector for the title when using function persp.

ticktype

A character vector for defining the tick marks when using function persp.

r

A positive number for the distance of the eyepoint from the center of the plot when using function persp.

phi

A number specifying the collatitude when using function persp.

theta

A number specifying the azimuthal direction when using function persp.

Value

No return value, called for side effects.

See Also

plotFEM.mesh, eval.FEM.fd

Examples

#  Set up and plot a square with side length one with 32 interior triangles,
#  and then create an order one functional basis object of type FEM.
m <- 4
petList <- squareMesh(m)
pts <- petList$p
edg <- petList$e
tri <- petList$t
pts <- pts/m
plotFEM.mesh(pts, tri)
norder <- 1
FEMbasis <- create.FEM.basis(pts, edg, tri, norder)
#  set up surface values on the nodes of this mesh
data     <- sin(2*pi*pts[,1])*cos(2*pi*pts[,2])
#  smooth the data
FEMList  <- smooth.FEM.basis(pts, data, FEMbasis)
sincosfd <- FEMList$fd
#  set up a 21 by 21 grid of plotting points
Npts <- 21
Xpts <- seq(0,1,len=Npts)
Ypts <- Xpts
#  plot the surface
oldpar <- par(no.readonly = TRUE)
plotFEM.fd(sincosfd, Xpts, Ypts)
#  plot the X partial derivative of the surface
plotFEM.fd(sincosfd, Xpts, Ypts, c(1,0))
#  plot the Y partial derivative of the surface
plotFEM.fd(sincosfd, Xpts, Ypts, c(0,1))
par(oldpar)