https://github.com/cran/smacof
Tip revision: 55dc1e284918ce6116d8af8ea5445a7448134f7b authored by Jan de Leeuw on 12 December 2008, 10:28:18 UTC
version 0.9-1
version 0.9-1
Tip revision: 55dc1e2
plot.smacof.R
# plot method for all smacof objects
plot.smacof <- function(x, plot.type = "confplot", plot.dim = c(1,2), sphere = TRUE,
main, xlab, ylab, ...)
# x ... object of class smacof
# plot.type ... types available: "confplot", "Shepard", "resplot"
# sphere ... if TRUE, sphere is drawn for spherical smacof
{
#--------------- utility function for circle drawing -----------------
circle <- function(x, y, r, ...) {
ang <- seq(0, 2*pi, length = 100)
xx <- x + r * cos(ang)
yy <- y + r * sin(ang)
polygon(xx, yy, ...)
}
#------------ end utility functions ----------------
x1 <- plot.dim[1]
y1 <- plot.dim[2]
if (x$model == "Spherical SMACOF (dual)") { #remove first column
x$obsdiss <- as.dist(as.matrix(x$obsdiss1)[,-1][-1,])
x$confdiss <- as.dist(as.matrix(x$confdiss)[,-1][-1,])
}
#----------------- configuration plot ---------------------
if (plot.type == "confplot") {
if (missing(main)) main <- paste("Configuration Plot") else main <- main
if (missing(xlab)) xlab <- paste("Configurations D", x1,sep = "") else xlab <- xlab
if (missing(ylab)) ylab <- paste("Configurations D", y1,sep = "") else ylab <- ylab
plot(x$conf[,x1], x$conf[,y1], main = main, type = "n", xlab = xlab, ylab = ylab, ...)
if ((any(class(x) == "smacofSP")) && (sphere)) {
if (x$model == "Spherical SMACOF (dual)") { #dual smacof centered around first configuration row
radius <- sqrt((abs(x$conf[2,1])+abs(x$conf[1,1]))^2 + (abs(x$conf[2,2])+abs(x$conf[1,2]))^2) #sphere radius dual
circle(x$conf[1,1], x$conf[1,2], radius, lty = 2, border = "lightgray")
} else {
radius <- sqrt(x$conf[2,1]^2 + x$conf[2,2]^2)
circle(0, 0, radius, lty = 2, border = "lightgray")
}
}
text(x$conf[,x1], x$conf[,y1], labels = rownames(x$conf), cex = 0.8)
}
#---------------- Shepard diagram ------------------
#FIXME diagram for spherical
if (plot.type == "Shepard") {
if (missing(main)) main <- paste("Shepard Diagram") else main <- main
if (missing(xlab)) xlab <- "Observed Distances" else xlab <- xlab
if (missing(ylab)) ylab <- "Configuration Distances" else ylab <- ylab
isofit <- isoreg(as.vector(x$obsdiss), as.vector(x$confdiss)) #isotonic regression
plot(as.vector(x$obsdiss), as.vector(x$confdiss), main = main, type = "p", pch = 1,
xlab = xlab, ylab = ylab, col = "lightgray", ...)
points(sort(isofit$x), isofit$yf, type = "b", pch = 16)
}
#--------------- Residual plot --------------------
#FIXME smacof sphere
if (plot.type == "resplot") {
if (missing(main)) main <- paste("Residual plot") else main <- main
if (missing(xlab)) xlab <- "Configuration Distances" else xlab <- xlab
if (missing(ylab)) ylab <- "Residuals" else ylab <- ylab
resmat <- residuals(x)
plot(as.vector(x$confdiss), as.vector(resmat[lower.tri(resmat)]), main = main, type = "p",
xlab = xlab, ylab = ylab, ...)
abline(h = 0, col = "lightgray", lty = 2)
}
#----------------------- Stress decomposition -----------------
#FIXME smacofSphere
if (plot.type == "stressplot") {
if (missing(main)) main <- paste("Stress Decomposition Chart") else main <- main
if (missing(xlab)) xlab <- "Objects" else xlab <- xlab
if (missing(ylab)) ylab <- "Stress Proportion (%)" else ylab <- ylab
stress.ri <- ((as.matrix(x$obsdiss) - as.matrix(x$confdiss))^2) #sorted decomposed stress values
stress.r <- rowSums(stress.ri)
decomp.stress <- stress.r/(sum(stress.r))*100
sdecomp.stress <- sort(decomp.stress, decreasing = TRUE)
xaxlab <- names(sdecomp.stress)
plot(1:length(decomp.stress), sdecomp.stress, xaxt = "n", type = "p",
xlab = xlab, ylab = ylab, main = main, ...)
text(1:length(decomp.stress), sdecomp.stress, labels = xaxlab, pos = 3, cex = 0.8)
for (i in 1:length(sdecomp.stress)) lines(c(i,i), c(sdecomp.stress[i],0), col = "lightgray", lty = 2)
}
#if (plot.type == "smearing") {
# delta.r <- as.matrix(x$confdiss)[1,]
# bw <- npregbw(formula=delta.r~x$conf[,1]+x$conf[,2], tol=.1, ftol=.1)
# model <- npreg(bws = bw)
#predict(model, newdata)
#x... sequence(min(x$conf[,1],max(x$conf[,1]))
#y... sequence(min(x$conf[,2],max(x$conf[,2]))
}