fields (version 5.02)

fields.hints: fields - graphics hints

Description

Here are some technical hints for assembling multiple plots with common legends or axes and setting the graphics parameters to make more readable figures . These use the standard graphics environment.

Usage

fields.style()
fields.color.picker()

Details

fields.style is a simple function to enlarge the characters in a plot and set the colors. List this out to modify the choices.

Examples

##Two examples of concentrating a panel of plots together
## to conserve the white space. 
## see also the example in image.plot using split.screen. 
## The basic trick is to use the oma option to reserve some space around the 
## plots.  Then unset the outer margins to use that room. 

library( fields)

# some hokey image data
x<- 1:20
y<- 1:15
z<-  outer( x,y,"+")
zr<- range( c(z))

# add common legend to 3X2 panel 

par( oma=c(4,0,0,0))
set.panel( 3,2)
par( mar=c(1,1,0,0))

# squish plots together with just 1 space between
for ( k in 1:6){
image( x,y,z, axes=FALSE, xlab="", ylab="", zlim=zr)
}

par( oma=c(0,0,0,0))
image.plot( zlim=zr, legend.only=TRUE, horizontal=TRUE, legend.mar=5)

# you may have to play around with legend.mar and the oma settings to
# get enough space.



##
### also add some axes on the sides. in a lattice style 
## note oma adds some more room at bottom. 

par( oma=c(8,6,1,1))
set.panel( 3,2)
par( mar=c(1,1,0,0))
##
for ( k in 1:6){
 image( x,y,z, axes=FALSE, xlab="", ylab="", zlim=zr)
 box() # box around figure

# maybe draw an x axis 
  if( k  %in% c(5,6) ){
  axis( 1, cex.axis=1.5)
  mtext( line=4, side=1, "Xstuff")}

# maybe draw a y axis
  if( k  %in% c(1,3,5) ){
  axis( 2, cex.axis=1.5)
  mtext( line=4, side=2, "Ystuff")}
}

# same trick of adding a legend strip. 
par( oma=c(0,0,0,0))
image.plot( zlim=zr, legend.only=TRUE, horizontal=TRUE, legend.mar=5)

# reset panel 
set.panel()


####
# show colors
## the factory colors:

clab<- colors()
n<- length( clab)
N<- ceiling( sqrt(n) )
M<- N
temp<- rep( NA,M*N)
temp[1:n] <- 1:n
z<- matrix(temp, M,N)

image(seq(.5,M+.5,,M+1), seq(.5,N+.5,,N+1)
       , z,  col=clab, axes=FALSE, xlab="", ylab="")


# see the  function  fields.color.picker() to locate colors



# dumping out colors by name for a latex document
# this creates text strings that are the LaTeX color definitions
# using the definecolor function. 

clab<- colors()
for( nn in clab){
  temp<- signif(col2rgb(nn)/256, 3)
   cat(
    "\definecolor{", 
                nn, "}",
    "{rgb}{", temp[1], 
          ",", temp[2], 
          ",", temp[3], 
           "}", fill=TRUE , sep="")
}