# last modified 23 January 2007 by J. Fox
# last modified 10/6/2008 8:32AM by M. Friendly
# - added shade=, shade.alpha=, wire=
# - fixed: grand.mean=FALSE not respected
# - replaced sphere at grand.mean with cross3d
# last modified 10/7/2008 11:26AM by M. Friendly
# - color means according to the color of the term
# last modified 10/15/2008 4:21PM by M. Friendly
# - return bounding boxes of the ellipsoids
# last modified 10/28/2008 9:37AM by M. Friendly
# - replaced rgl.texts with texts3d
# - replaced ellipsoid() with spheres3d() for plotting means
# last modified 11/4/2008 12:50PM by M. Friendly
# - reverted to ellipsoid() for plotting means
# last modified 11/6/2008 by M. Friendly
# - added xlim, ylim, zlim arguments to allow expanding the plot bbox (for candisc)
# last modified 29 Dec 2009 by M. Friendly -- added idate=, idesign=, icontrasts, iterm for repeated measures
# last modified 30 Dec 2009 by M. Friendly -- debugged repeated measures
# last modified 1 Jan 2010 by M. Friendly -- debugged repeated measures again
# last modified 1 Jan 2010 by M. Friendly -- merged heplot3d.R and heplot.mlm.R
# last modified 12 Feb 2010 by M. Friendly -- fixed buglet with text3d causing rgl to crash (thx: Duncan Murdoch)
# last modified 23 Jul 2010 by M. Friendly -- return radius
# -- added err.label to allow changing label for Error ellipse
# last modified 26 Apr 2013 by M. Friendly
# -- modified ellipsoid to reduce striation (Thx: Duncan Murdoch)
# -- changed default colors and default fill.alpha
# 10/20/2020 Fixed moire problem in heplot3d when dfh <3 (Thx: Duncan Murdoch)
# -- uses back="culled" & depth_mask=FALSE properties
# 9/22/2022 Add cex.label arg
# TODO what is this doing here?
savedvars <- new.env(parent=emptyenv())
#' Three-Dimensional HE Plots
#'
#' This function plots ellipsoids in 3D representing the hypothesis and error
#' sums-of-squares-and-products matrices for terms and linear hypotheses in a
#' multivariate linear model.
#'
#' When the H matrix for a term has rank < 3, the ellipsoid collapses to an
#' ellipse (rank(H)=2) or a line (rank(H)=1).
#'
#' Rotating the plot can be particularly revealing, showing views in which H
#' variation is particularly large or small in relation to E variation. See
#' \code{\link[rgl]{play3d}} and \code{\link[rgl]{movie3d}} for details on
#' creating animations.
#'
#' The arguments \code{xlim}, \code{ylim}, and \code{zlim} can be used to
#' expand the bounding box of the axes, but cannot decrease it.
#'
#' @aliases heplot3d heplot3d.mlm
#' @param mod a model object of class \code{"mlm"}.
#' @param terms a logical value or character vector of terms in the model for
#' which to plot hypothesis matrices; if missing or \code{TRUE}, defaults to
#' all terms; if \code{FALSE}, no terms are plotted.
#' @param hypotheses optional list of linear hypotheses for which to plot
#' hypothesis matrices; hypotheses are specified as for the
#' \code{\link[car]{linearHypothesis}} function in the \code{car} package; the
#' list elements can be named, in which case the names are used.
#' @param term.labels logical value or character vector of names for the terms
#' to be plotted. If \code{TRUE} (the default) the names of the terms are used;
#' if \code{FALSE}, term labels are not plotted.
#' @param hyp.labels logical value or character vector of names for the
#' hypotheses to be plotted. If \code{TRUE} (the default) the names of
#' components of the list of hypotheses are used; if \code{FALSE}, hypothesis
#' labels are not plotted.
#' @param err.label Label for the error ellipse
#' @param variables indices or names of the three response variables to be
#' plotted; defaults to \code{1:3}.
#' @param error.ellipsoid if \code{TRUE}, plot the error ellipsoid; defaults to
#' \code{TRUE}, if the argument \code{add} is \code{FALSE} (see below).
#' @param factor.means logical value or character vector of names of factors
#' for which the means are to be plotted, or \code{TRUE} or \code{FALSE};
#' defaults to \code{TRUE}, if the argument \code{add} is \code{FALSE} (see
#' below).
#' @param grand.mean if \code{TRUE}, plot the centroid for all of the data;
#' defaults to \code{TRUE}, if the argument \code{add} is \code{FALSE} (see
#' below).
#' @param remove.intercept if \code{TRUE} (the default), do not plot the
#' ellipsoid for the intercept even if it is in the MANOVA table.
#' @param type ``type'' of sum-of-squares-and-products matrices to compute; one
#' of \code{"II"}, \code{"III"}, \code{"2"}, or \code{"3"}, where \code{"II"}
#' is the default (and \code{"2"} is a synonym).
#' @param idata an optional data frame giving a factor or factors defining the
#' intra-subject model for multivariate repeated-measures data. See Details of
#' \code{\link[car]{Anova}} for an explanation of the intra-subject design and
#' for further explanation of the other arguments relating to intra-subject
#' factors.
#' @param idesign a one-sided model formula using the ``data'' in idata and
#' specifying the intra-subject design for repeated measure models.
#' @param icontrasts names of contrast-generating functions to be applied by
#' default to factors and ordered factors, respectively, in the within-subject
#' ``data''; the contrasts must produce an intra-subject model matrix in which
#' different terms are orthogonal. The default is c("contr.sum", "contr.poly").
#' @param imatrix In lieu of \code{idata} and \code{idesign}, you can specify
#' the intra-subject design matrix directly via \code{imatrix}, in the form of
#' list of named elements. Each element gives the columns of the
#' within-subject model matrix for an intra-subject term to be tested, and must
#' have as many rows as there are responses; the columns of the within-subject
#' model matrix for \emph{different} terms must be mutually orthogonal.
#' @param iterm For repeated measures designs, you must specify one
#' intra-subject term (a character string) to select the SSPE (E) matrix used
#' in the HE plot. Hypothesis terms plotted include the \code{iterm} effect as
#' well as all interactions of \code{iterm} with \code{terms}.
#' @param manova optional \code{Anova.mlm} object for the model; if absent a
#' MANOVA is computed. Specifying the argument can therefore save computation
#' in repeated calls.
#' @param size how to scale the hypothesis ellipsoid relative to the error
#' ellipsoid; if \code{"evidence"}, the default, the scaling is done so that a
#' ``significant'' hypothesis ellipsoid extends outside of the error ellipsoid;
#' if \code{"effect.size"}, the hypothesis ellipsoid is on the same scale as
#' the error ellipsoid.
#' @param level equivalent coverage of ellipsoid for normally-distributed
#' errors, defaults to \code{0.68}.
#' @param alpha significance level for Roy's greatest-root test statistic; if
#' \code{size="evidence"}, then the hypothesis ellipsoid is scaled so that it
#' just touches the error ellipsoid at the specified alpha level; a larger
#' hypothesis ellipsoid therefore indicates statistical significance; defaults
#' to \code{0.05}.
#' @param segments number of segments composing each ellipsoid; defaults to \code{40}.
#' @param col a color or vector of colors to use in plotting ellipsoids; the
#' first color is used for the error ellipsoid; the remaining colors ---
#' recycled as necessary --- are used for the hypothesis ellipsoid. A single
#' color can be given, in which case it is used for all ellipsoid. For
#' convenience, the default colors for all heplots produced in a given session
#' can be changed by assigning a color vector via \code{options(heplot3d.colors=c(...)}.
#' Otherwise, the default colors are \code{c("pink", "blue",
#' "black", "darkgreen", "darkcyan", "magenta", "brown", "darkgray")}.
#' @param lwd a two-element vector giving the line width for drawing ellipsoids
#' (including those that degenerate to an ellipse) and for drawing ellipsoids
#' that degenerate to a line segment. The default is \code{c(1, 4)}.
#' @param shade a logical scalar or vector, indicating whether the ellipsoids
#' should be rendered with \code{\link[rgl]{shade3d}}. Works like \code{col},
#' except that \code{FALSE} is used for any 1 df degenerate ellipsoid.
#' @param shade.alpha a numeric value in the range [0,1], or a vector of such
#' values, giving the alpha transparency for ellipsoids rendered with
#' \code{shade=TRUE}.
#' @param wire a logical scalar or vector, indicating whether the ellipsoids
#' should be rendered with \code{\link[rgl]{wire3d}}. Works like \code{col},
#' except that \code{TRUE} is used for any 1 df degenerate ellipsoid.
#' @param bg.col background colour, \code{"white"} or \code{"black"},
#' defaulting to \code{"white"}.
#' @param fogtype type of ``fog'' to use for depth-cueing; the default is
#' \code{"none"}. See \code{\link[rgl]{bg}}.
#' @param fov field of view angle; controls perspective. See
#' \code{\link[rgl]{viewpoint}}.
#' @param offset proportion of axes to off set labels; defaults to \code{0.01}.
#' @param xlab x-axis label; defaults to name of the x variable.
#' @param ylab y-axis label; defaults to name of the y variable.
#' @param zlab z-axis label; defaults to name of the z variable.
#' @param xlim x-axis limits; if absent, will be computed from the data.
#' @param ylim y-axis limits; if absent, will be computed from the data.
#' @param zlim z-axis limits; if absent, will be computed from the data.
#' @param cex.label text size for ellipse labels
#' @param add if \code{TRUE}, add to the current plot; the default is
#' \code{FALSE}. If \code{TRUE}, the error ellipsoid is neither plotted nor
#' returned in the output object.
#' @param verbose if \code{TRUE}, print the MANOVA table and details of
#' hypothesis tests; the default is \code{FALSE}.
#' @param warn.rank if \code{TRUE}, do not suppress warnings about the rank of
#' the hypothesis matrix when the ellipsoid collapses to an ellipse or line;
#' the default is \code{FALSE}.
#' @param \dots arguments passed from generic.
#' @return \code{heplot3d} invisibly returns a list containing the bounding
#' boxes of the error (E) ellipsoid and for each term or linear hypothesis
#' specified in the call. Each of these is a 2 x 3 matrix with rownames "min"
#' and "max" and colnames corresponding to the variables plotted. An additional
#' component, \code{center}, contains the coordinates of the centroid in the
#' plot.
#'
#' The function also leaves an object named \code{.frame} in the global
#' environment, containing the rgl object IDs for the axes, axis labels, and
#' bounding box; these are deleted and the axes, etc. redrawn if the plot is
#' added to.
#' @seealso
#' \code{\link[car]{Anova}}, \code{\link[car]{linearHypothesis}}, for
#' details on MANOVA tests and linear hypotheses
#'
#' \code{\link{heplot}}, \code{\link{pairs.mlm}}, for other plotting methods
#' for \code{mlm} objects
#'
#' \code{\link[rgl]{rgl-package}}, for details about 3D plots with \code{rgl}
#'
#' \code{\link[candisc]{heplot3d.candisc}} for 3D HE plots in canonical space.
#'
#' @references
#' Friendly, M. (2006). Data Ellipses, HE Plots and Reduced-Rank
#' Displays for Multivariate Linear Models: SAS Software and Examples
#' \emph{Journal of Statistical Software}, 17(6), 1-42.
#' \url{https://www.jstatsoft.org/v17/i06/}
#'
#' Friendly, M. (2007). HE plots for Multivariate General Linear Models.
#' \emph{Journal of Computational and Graphical Statistics}, 16(2) 421-444.
#' \url{http://datavis.ca/papers/jcgs-heplots.pdf}
#' @keywords hplot aplot dynamic multivariate
#' @examples
#'
#' # Soils data, from carData package
#' data(Soils, package = "carData")
#' soils.mod <- lm(cbind(pH,N,Dens,P,Ca,Mg,K,Na,Conduc) ~ Block + Contour*Depth, data=Soils)
#' car::Anova(soils.mod)
#'
#' heplot(soils.mod, variables=c("Ca", "Mg"))
#' pairs(soils.mod, terms="Depth", variables=c("pH", "N", "P", "Ca", "Mg"))
#'
#' heplot3d(soils.mod, variables=c("Mg", "Ca", "Na"), wire=FALSE)
#'
#' # Plastic data
#' plastic.mod <- lm(cbind(tear, gloss, opacity) ~ rate*additive, data=Plastic)
#' \dontrun{
#' heplot3d(plastic.mod, col=c("red", "blue", "brown", "green3"), wire=FALSE)
#' }
#'
#' @export heplot3d
heplot3d <-
function(mod, ...) UseMethod("heplot3d")
# TODO:
# - add aspect argument (for candisc)
#' @rdname heplot3d
#' @exportS3Method heplot3d mlm
heplot3d.mlm <-
function (
mod, # an mlm object
terms, # vector of terms to plot H ellipses
hypotheses, # list of linear hypotheses for which to plot H ellipses
term.labels=TRUE, # TRUE, FALSE or a list of term labels of length(terms)
hyp.labels=TRUE, # as above for term.labels
err.label="Error",
variables=1:3, # x,y variables for the plot [variable names or numbers]
error.ellipsoid=!add,
factor.means=!add,
grand.mean=!add,
remove.intercept=TRUE,
type=c("II", "III", "2", "3"),
idata=NULL,
idesign=NULL,
icontrasts=c("contr.sum", "contr.poly"),
imatrix=NULL,
iterm=NULL,
manova, # an optional Anova.mlm object
size=c("evidence", "effect.size"),
level=0.68,
alpha=0.05,
segments=40, # line segments in each ellipse
# col=palette()[-1], # colors for E matrix, H matrices
col=getOption("heplot3d.colors", c("red", "blue", "black", "darkgreen", "darkcyan",
"magenta", "brown","darkgray")),
# colors for H matrices, E matrix
lwd=c(1, 4), # line width for drawing ellipsoids and 1d degenerate ellipsoids
shade=TRUE, # use shade3d to render ellipsoids?
shade.alpha=0.2, # alpha transparency for shaded3d
wire=c(TRUE,FALSE), # use wire3d to render ellipsoids?
bg.col=c("white", "black"), # background colour
fogtype=c("none", "exp2", "linear", "exp"), # fog -- for depth cueing
fov=30, # field of view (for perspective)
offset=0.01, # for ellipsoid labels
xlab,
ylab,
zlab,
xlim,
ylim,
zlim,
cex.label = 1.5, # text size for ellipse labels
add=FALSE, # add to existing plot?
verbose=FALSE,
warn.rank=FALSE,
...) {
ellipsoid <- function(center,
shape,
radius=1,
label="",
cex.label,
col,
df=Inf,
shade=TRUE,
alpha=0.1,
wire=TRUE){
# adapted from the shapes3d demo in the rgl package and from the Rcmdr package
# modified to return the bbox of the ellipsoid
degvec <- seq(0, 2*pi, length=segments)
ecoord2 <- function(p) c(cos(p[1])*sin(p[2]), sin(p[1])*sin(p[2]), cos(p[2]))
# v <- t(apply(expand.grid(degvec,degvec), 1, ecoord2)) # modified to make smoother
v <- t(apply(expand.grid(degvec,degvec/2), 1, ecoord2))
if (!warn.rank){
warn <- options(warn=-1)
on.exit(options(warn))
}
Q <- chol(shape, pivot=TRUE)
lwd <- if (df < 2) lwd[2] else lwd[1]
order <- order(attr(Q, "pivot"))
v <- center + radius * t(v %*% Q[, order])
v <- rbind(v, rep(1,ncol(v)))
e <- expand.grid(1:(segments-1), 1:segments)
i1 <- apply(e, 1, function(z) z[1] + segments*(z[2] - 1))
i2 <- i1 + 1
i3 <- (i1 + segments - 1) %% segments^2 + 1
i4 <- (i2 + segments - 1) %% segments^2 + 1
i <- rbind(i1, i2, i4, i3)
x <- rgl::asEuclidean(t(v))
ellips <- rgl::qmesh3d(v, i)
# override settings for 1 df line
if (df<2) {
wire <- TRUE
shade <- FALSE
}
back <- if (df < 3) "culled" else "filled"
depth_mask <- if (alpha <.8) FALSE else TRUE
if (verbose) cat(paste("df=", df, "col:", col, " shade:", shade, " alpha:", alpha,
" wire:", wire, "back:", back, "depth_mask:", depth_mask,
sep=" "), "\n")
if(shade) rgl::shade3d(ellips,
col=col, alpha=alpha, lit=TRUE, back=back, depth_mask=depth_mask)
if(wire) rgl::wire3d(ellips,
col=col, size=lwd, lit=FALSE, back=back, depth_mask=depth_mask)
bbox <- matrix(rgl::par3d("bbox"), nrow=2)
ranges <- apply(bbox, 2, diff)
if (!is.null(label) && label !="")
rgl::texts3d(x[which.max(x[,2]),] + offset*ranges, adj=0, texts=label, color=col, lit=FALSE)
rownames(bbox) <- c("min", "max")
return(bbox)
}
if (!requireNamespace("rgl")) stop("rgl package is required.")
# avoid deprecated warnings from car
#if (car2 <- packageDescription("car")[["Version"]] >= 2) linear.hypothesis <- linearHypothesis
type <- match.arg(type)
size <- match.arg(size)
fogtype <- match.arg(fogtype)
bg.col <- match.arg(bg.col)
data <- model.frame(mod)
if (missing(manova)) {
if (is.null(imatrix)) {
manova <- car::Anova(mod, type=type, idata=idata, idesign=idesign, icontrasts=icontrasts)
}
else {
manova <- car::Anova(mod, type=type, idata=idata, idesign=idesign, icontrasts=icontrasts, imatrix=imatrix)
}
}
# if (verbose) print(manova)
# response.names <- rownames(manova$SSPE)
if (is.null(idata) && is.null(imatrix)) {
Y <- model.response(data)
SSPE <- manova$SSPE
}
else {
if (is.null(iterm)) stop("Must specify a within-S iterm for repeated measures designs" )
### FIXME::car -- workaround for car::Anova.mlm bug: no names assigned to $P component
if (is.null(names(manova$P))) names(manova$P) <- names(manova$SSPE)
Y <- model.response(data) %*% manova$P[[iterm]]
SSPE <- manova$SSPE[[iterm]]
}
if (!is.null(rownames(SSPE))) {response.names <- rownames(SSPE)}
else {response.names <- paste("V.", 1:nrow(SSPE), sep="")}
if (!is.numeric(variables)) {
vars <- variables
variables <- match(vars, response.names)
check <- is.na(variables)
if (any(check)) stop(paste(vars[check], collapse=", "),
" not among response variables.")
}
else {
if (any (variables > length(response.names))) stop("There are only ",
length(response.names), " response variables.")
vars <- response.names[variables]
}
if (length(variables) != 3) {
extra <- if (length(variables) == 1) 'heplot1d()' else
if (length(variables) == 2) 'heplot()' else 'pairs()'
stop(paste("You may only plot 3 response variables. Use", extra))
}
if (missing(terms) || (is.logical(terms) && terms)) {
terms <- manova$terms
if (!is.null(iterm)) {
terms <- terms[grep(iterm, terms)] ## only include those involving iterm
}
if (remove.intercept) terms <- terms[terms != "(Intercept)"]
}
n.terms <- if (!is.logical(terms)) length(terms) else 0
# note: if logical here, necessarily FALSE
n.hyp <- if (missing(hypotheses)) 0 else length(hypotheses)
n.ell <- n.terms + n.hyp
if (n.ell == 0) stop("Nothing to plot.")
E <- SSPE
p <- nrow(E)
E <- E[variables, variables]
Y <- Y[,vars]
gmean <- if (missing(data)) c(0,0,0)
else colMeans(Y)
if (missing(xlab)) xlab <- vars[1]
if (missing(ylab)) ylab <- vars[2]
if (missing(zlab)) zlab <- vars[3]
dfe <- manova$error.df
scale <- 1/dfe
E <- E * scale
radius <- sqrt(3 * qf(level, 3, dfe))
col <- he.rep(col, n.ell); E.col<- col[length(col)]
shade <- he.rep(shade, n.ell)
shade.alpha <- he.rep(shade.alpha, n.ell)
wire <- he.rep(wire, n.ell)
if (!add){
rgl::open3d()
rgl::view3d(fov=fov)
rgl::bg3d(color=bg.col, fogtype=fogtype)
}
if (error.ellipsoid) {
E.ellipsoid <- ellipsoid(gmean, E, radius, col=E.col,
label=err.label, cex.label = cex.label,
df=dfe,
shade=shade[[length(shade)]],
alpha=shade.alpha[[length(shade.alpha)]],
wire=wire[[length(wire)]])
colnames(E.ellipsoid) <- vars
}
term.labels <- if (n.terms == 0) NULL
else if (!is.logical(term.labels)) term.labels
else if (term.labels) terms else rep("", n.terms)
H.ellipsoid <- as.list(rep(0, n.ell))
if (n.terms > 0) for (term in 1:n.terms){
term.name <- terms[term]
H <- manova$SSP[[term.name]]
H <- H[variables, variables]
dfh <- manova$df[term.name]
# scale <- eval(parse(text=h.scale))
factor <- if (size == "evidence") lambda.crit(alpha, p, dfh, dfe) else 1
H <- H * scale/factor
if (verbose){
cat(term.name, " H matrix (", dfh, " df):\n")
print(H)
}
if((!shade[term]) & !wire[term])
warning(paste("shate and wire are both FALSE for ", term), call.=FALSE)
H.ellipsoid[[term]] <- ellipsoid(gmean, H, radius, col=col[term],
label=term.labels[term], cex.label = cex.label,
df=dfh, shade=shade[term], alpha=shade.alpha[term],
wire=wire[term])
colnames(H.ellipsoid[[term]]) <- vars
}
hyp.labels <- if (n.hyp == 0) NULL
else if (!is.logical(hyp.labels)) hyp.labels
else if (hyp.labels) names(hypotheses) else rep("", n.hyp)
if (n.hyp > 0) for (hyp in 1:n.hyp){
lh <- car::linearHypothesis(mod, hypotheses[[hyp]])
H <- lh$SSPH[variables, variables]
dfh <- lh$df
factor <- if (size == "evidence") lambda.crit(alpha, p, dfh, dfe) else 1
H <- H * scale/factor
if (verbose){
cat("\n\n Linear hypothesis: ", names(hypotheses)[[hyp]], "\n")
print(lh)
}
term <- n.terms + hyp
H.ellipsoid[[term]] <- ellipsoid(gmean, H, radius, col=col[term],
label=hyp.labels[hyp], cex.label = cex.label,
df=dfh, shade=shade[term], alpha=shade.alpha[term], wire=wire[term])
}
ranges <- apply(matrix(rgl::par3d("bbox"), nrow=2), 2, diff)
# if (grand.mean) ellipsoid(gmean, diag((ranges/40)^2), col="black", wire=FALSE, alpha=0.8) # centre dot
# better: use a centered 3D cross here
if (grand.mean) cross3d(gmean, (ranges/25), col="black", lwd=2) # centre cross
#browser()
## BUG fixed here: should only label the means for factors included in terms
if ((!is.logical(factor.means)) || factor.means){
factors <- data[, sapply(data, is.factor), drop=FALSE]
factor.names <- colnames(factors)
if (is.null(iterm)) factor.names <- factor.names[factor.names %in% terms]
if (!is.logical(factor.means)){
which <- match(factor.means, factor.names)
check <- is.na(which)
if (any(check)) stop(paste(factor.means[check], collapse=", "),
" not among factors.")
factors <- factors[, which, drop=FALSE]
}
else factors <- factors[, factor.names, drop=FALSE]
# for (fac in factors){
# means <- aggregate(Y, list(fac), mean)
if (ncol(factors)) for (j in 1:ncol(factors)){
means <- aggregate(Y, list(factors[,j]), mean)
# color the points the same as the ellipse for the term
loc <- match(factor.names[j], terms, nomatch=0)
pcol <- if (loc>0) col[loc] else "black"
for (m in 1:nrow(means)) {
ellipsoid(unlist(means[m, 2:4]), diag((ranges/100))^2, col=pcol,
wire=FALSE, alpha=0.8)
# points3d(unlist(means[m, 2:4]), size=3, color=pcol)
# spheres3d(unlist(means[m, 2:4]), radius=diag((ranges/30))^2, color=pcol)
}
rgl::texts3d(means[,2:4] + matrix(offset*ranges, nrow(means), 3, byrow=TRUE),
texts=as.character(means[,1]), color=pcol, adj=0)
}
}
# handle xlim, ylim, zlim
## enforce that the specified limits are at least as large as the bbox
if (!missing(xlim) | !missing(ylim) | !missing(zlim)) {
bbox <- matrix(rgl::par3d("bbox"),3,2,byrow=TRUE)
xlim <- if(missing(xlim)) bbox[1,] else c(min(xlim[1],bbox[1,1]), max(xlim[2],bbox[1,2]))
ylim <- if(missing(ylim)) bbox[2,] else c(min(ylim[1],bbox[2,1]), max(ylim[2],bbox[2,2]))
zlim <- if(missing(zlim)) bbox[3,] else c(min(zlim[1],bbox[3,1]), max(zlim[2],bbox[3,2]))
rgl::decorate3d(xlim=xlim, ylim=ylim, zlim=zlim,
box=FALSE, axes=FALSE,
xlab=NULL, ylab=NULL, zlab=NULL, top=FALSE)
}
# TODO: allow cex for axis labels
if (add) rgl::pop3d(id=savedvars$.frame)
frame <- rgl::axis3d("x-", color="black")
frame <- c(frame, rgl::mtext3d(xlab, "x-", color="black", line=1.5))
frame <- c(frame, rgl::axis3d("y-", col="black"))
frame <- c(frame, rgl::mtext3d(ylab, "y-", color="black", line=1.5))
frame <- c(frame, rgl::axis3d("z-", col="black"))
frame <- c(frame, rgl::mtext3d(zlab, "z-", color="black", line=1.5))
frame <- c(frame, rgl::box3d(col="black"))
assign(".frame", frame, envir=savedvars)
# savedvars$.frame <- frame
rgl::aspect3d(x=1, y=1, z=1)
names(H.ellipsoid) <- c(if (n.terms > 0) term.labels, if (n.hyp > 0) hyp.labels)
result <- if(error.ellipsoid) list(H=H.ellipsoid, E=E.ellipsoid, center=gmean, radius=radius)
else list(H=H.ellipsoid, center=gmean, radius=radius)
class(result) <- "heplot3d"
invisible(result)
}
.frame <- NULL # avoid warning
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