Plot Function Values
Plot method for the class "fv".
## S3 method for class 'fv'
plot(x, fmla, ..., subset=NULL, lty=NULL, col=NULL, lwd=NULL,
xlim=NULL, ylim=NULL, xlab=NULL, ylab=NULL, ylim.covers=NULL,
legend=!add, legendpos="topleft", legendavoid=missing(legendpos),
legendmath=TRUE, legendargs=list(),
shade=fvnames(x, ".s"), shadecol="grey",
add=FALSE, log="",
mathfont=c("italic", "plain", "bold", "bolditalic"),
limitsonly=FALSE)x |
An object of class |
fmla |
an R language formula determining which variables or expressions are plotted. Either a formula object, or a string that can be parsed as a formula. See Details. |
subset |
(optional) subset of rows of the data frame that will be plotted. |
lty |
(optional) numeric vector of values of the graphical parameter
|
col |
(optional) numeric vector of values of the graphical parameter
|
lwd |
(optional) numeric vector of values of the graphical parameter
|
xlim |
(optional) range of x axis |
ylim |
(optional) range of y axis |
xlab |
(optional) label for x axis |
ylab |
(optional) label for y axis |
... |
Extra arguments passed to |
ylim.covers |
Optional vector of y values that must be included in the
y axis. For example |
legend |
Logical flag or |
legendpos |
The position of the legend. Either a character string keyword
(see |
legendavoid |
Whether to avoid collisions between the legend and the graphics.
Logical value.
If |
legendmath |
Logical. If |
legendargs |
Named list containing additional arguments to be passed to
|
shade |
A character vector giving the names of two columns of |
shadecol |
The colour to be used in the |
add |
Logical. Whether the plot should be added to an existing plot |
log |
A character string which contains |
mathfont |
Character string. The font to be used for mathematical expressions in the axis labels and the legend. |
limitsonly |
Logical. If |
This is the plot method for the class "fv".
The use of the argument fmla is like plot.formula, but offers
some extra functionality.
The left and right hand sides of fmla are evaluated,
and the results are plotted against each other
(the left side on the y axis
against the right side on the x axis).
The left and right hand sides of fmla may be
the names of columns of the data frame x,
or expressions involving these names. If a variable in fmla
is not the name of a column of x, the algorithm will search for
an object of this name in the environment where plot.fv was
called, and then in the enclosing environment, and so on.
Multiple curves may be specified by a single formula
of the form
cbind(y1,y2,...,yn) ~ x, where x,y1,y2,...,yn are
expressions involving the variables in the data frame.
Each of the variables y1,y2,...,yn in turn will be plotted
against x.
See the examples.
Convenient abbreviations which can be used in the formula are
the symbol . which represents all the
columns in the data frame that will be plotted by default;
the symbol .x which represents the function argument;
the symbol .y which represents the recommended value
of the function.
For further information, see fvnames.
The value returned by this plot function indicates the meaning of the line types and colours in the plot. It can be used to make a suitable legend for the plot if you want to do this by hand. See the examples.
The argument shade can be used to display critical bands
or confidence intervals. If it is not NULL, then it should be
a subset index for the columns of x, that identifies exactly
2 columns. When the corresponding curves are plotted, the region
between the curves will be shaded in light grey. See the Examples.
The default values of lty, col and lwd can
be changed using spatstat.options("plot.fv").
Use type = "n" to create the plot region and draw the axes
without plotting any data.
Use limitsonly=TRUE to suppress all plotting
and just compute the x and y limits. This can be used
to calculate common x and y scales for several plots.
To change the kind of parenthesis enclosing the
explanatory text about the unit of length, use
spatstat.options('units.paren')
Invisible: either NULL, or a data frame giving the meaning of the
different line types and colours.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
K <- Kest(cells)
# K is an object of class "fv"
plot(K, iso ~ r) # plots iso against r
plot(K, sqrt(iso/pi) ~ r) # plots sqrt(iso/r) against r
plot(K, cbind(iso,theo) ~ r) # plots iso against r AND theo against r
plot(K, . ~ r) # plots all available estimates of K against r
plot(K, sqrt(./pi) ~ r) # plots all estimates of L-function
# L(r) = sqrt(K(r)/pi)
plot(K, cbind(iso,theo) ~ r, col=c(2,3))
# plots iso against r in colour 2
# and theo against r in colour 3
plot(K, iso ~ r, subset=quote(r < 0.2))
# plots iso against r for r < 10
# Can't remember the names of the columns? No problem..
plot(K, sqrt(./pi) ~ .x)
# making a legend by hand
v <- plot(K, . ~ r, legend=FALSE)
legend("topleft", legend=v$meaning, lty=v$lty, col=v$col)
# significance bands
KE <- envelope(cells, Kest, nsim=19)
plot(KE, shade=c("hi", "lo"))
# how to display two functions on a common scale
Kr <- Kest(redwood)
a <- plot(K, limitsonly=TRUE)
b <- plot(Kr, limitsonly=TRUE)
xlim <- range(a$xlim, b$xlim)
ylim <- range(a$ylim, b$ylim)
opa <- par(mfrow=c(1,2))
plot(K, xlim=xlim, ylim=ylim)
plot(Kr, xlim=xlim, ylim=ylim)
par(opa)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.