Graph of a variable using image and contour
performs a scatterplot
s.image(dfxy, z, xax = 1, yax = 2, span = 0.5, xlim = NULL, ylim = NULL, kgrid = 2, scale = TRUE, grid = FALSE, addaxes = FALSE, cgrid = 0, include.origin = FALSE, origin = c(0, 0), sub = "", csub = 1, possub = "topleft", neig = NULL, cneig = 1, image.plot = TRUE, contour.plot = TRUE, pixmap = NULL, contour = NULL, area = NULL, add.plot = FALSE)
dfxy |
a data frame containing the two columns for the axes |
z |
a vector of values on the |
xax |
the column number of x in |
yax |
the column number of y in |
span |
the parameter alpha which controls the degree of smoothing |
xlim |
the ranges to be encompassed by the x-axis, if NULL they are computed |
ylim |
the ranges to be encompassed by the y-axis, if NULL they are computed |
kgrid |
a number of points used to locally estimate the level line through the nodes of the grid,
used by |
scale |
if TRUE, data are centered and reduced |
grid |
if TRUE, the background grid is traced |
addaxes |
a logical value indicating whether the axes should be plotted |
cgrid |
a character size, parameter used with par("cex")* |
include.origin |
a logical value indicating whether the point "origin" should be belonged to the graph space |
origin |
the fixed point in the graph space, for example c(0,0) the origin axes |
sub |
a string of characters to be inserted as legend |
csub |
a character size for the legend, used with |
possub |
a string of characters indicating the sub-title position ("topleft", "topright", "bottomleft", "bottomright") |
neig |
an object of class |
cneig |
a size for the neighbouring graph lines used with |
image.plot |
if TRUE, the image is traced |
contour.plot |
if TRUE, the contour lines are plotted |
pixmap |
an object 'pixmap' displayed in the map background |
contour |
a data frame with 4 columns to plot the contour of the map : each row gives a segment (x1,y1,x2,y2) |
area |
a data frame of class 'area' to plot a set of surface units in contour |
add.plot |
if TRUE uses the current graphics window |
The matched call.
Daniel Chessel
if(!adegraphicsLoaded()) {
if(requireNamespace("splancs", quietly = TRUE)) {
wxy <- data.frame(expand.grid(-3:3, -3:3))
names(wxy) <- c("x", "y")
z <- (1 / sqrt(2)) * exp(-(wxy$x ^ 2 + wxy$y ^ 2) / 2)
par(mfrow = c(2, 2))
s.value(wxy, z)
s.image(wxy, z)
s.image(wxy, z, kgrid = 5)
s.image(wxy, z, kgrid = 15)
par(mfrow = c(1, 1))
}
## Not run:
data(t3012)
if(requireNamespace("splancs", quietly = TRUE)) {
par(mfrow = c(3, 4))
for(k in 1:12)
s.image(t3012$xy, scalewt(t3012$temp[, k]), kgrid = 3)
par(mfrow = c(1, 1))
}
data(elec88)
if(requireNamespace("splancs", quietly = TRUE)) {
par(mfrow = c(3,4))
for(k in 1:12)
s.image(t3012$xy, scalewt(t3012$temp[, k]), kgrid = 3, sub = names(t3012$temp)[k],
csub = 3, area = elec88$area)
par(mfrow = c(1, 1))
}
## End(Not run)
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