s.image {ade4}R Documentation

Graph of a variable using image and contour

Description

performs a scatterplot

Usage

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)

Arguments

dfxy a data frame containing the two columns for the axes
z a vector of values on the dfxy rows
xax the column number of x in dfxy
yax the column number of y in dfxy
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 kgrid*sqrt(length(z))
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")* cgrid to indicate the mesh of the grid
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 par("cex")*csub
possub a string of characters indicating the sub-title position ("topleft", "topright", "bottomleft", "bottomright")
neig an object of class neig
cneig a size for the neighbouring graph lines used with par("lwd")*cneig
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

Value

The matched call.

Author(s)

Daniel Chessel

Examples


if (require(splancs, quiet = 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)
}

## Not run: 
data(t3012)
if (require(splancs, quiet = TRUE)){
    par(mfrow = c(4,4))
    for(k in 1:12)  s.image(t3012$xy,scalewt(t3012$temp[,k]), kgrid = 3)
    par(mfrow = c(1,1))
}
    
data(elec88)
if (require(splancs, quiet = TRUE)){
   par(mfrow = c(4,4))
   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)

Worked out examples


> library(ade4)
> ### Name: s.image
> ### Title: Graph of a variable using image and contour
> ### Aliases: s.image
> ### Keywords: hplot
> 
> ### ** Examples
> 
> 
> if (require(splancs, quiet = 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)
+ }

Spatial Point Pattern Analysis Code in S-Plus

 Version 2 - Spatial and Space-Time analysis
> 
> data(t3012)
> if (require(splancs, quiet = TRUE)){
+     par(mfrow = c(4,4))
+     for(k in 1:12)  s.image(t3012$xy,scalewt(t3012$temp[,k]), kgrid = 3)
+     par(mfrow = c(1,1))
+ }
> 
> data(elec88)
> if (require(splancs, quiet = TRUE)){
+    par(mfrow = c(4,4))
+    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))
+ }
> 
> 
> 
> 
> 

[Package ade4 Index]