par(..., perm=true)
par can be used to set or query graphical parameters.
Parameters can be set by specifying them as arguments to par"
in tag=value form, or by passing them as a list of
tagged values.
In either case the previous values are returned in an invisible tagged list.
Such a list can be passed as an arument to par to
restore the parameter values.
Parameters are queried by giving vectors of character strings to
par.
In this case, the values are returned in a tagged list.
Arguments
adj
The value of adj determines the way in which text strings are justified.
A value of 0 produces right left-justified text, 0.5
centered text and 1 right-justified text.
ann
If set to false, high-level plotting functions do
not annotate the plots they produce with axis and overall
titles.
The default is to do annotation.
bg
The color to be used for the background of plots.
A description of how colors are specified is given below.
bty
A character string which determined the type of box which is drawn
about plots. If bty is one of are "o", "l", "7" or
"c" the resulting box resembles the corresponding upper case letter.
A value of "n" suppresses the box.
cex
A numerical value giving the amount by which text should be
scaled relative to the default.
col
A specification for the default plotting color.
A description of how colors are specified is given below.
crt
A numerical value specifying (in degrees) how strings should be rotated.
It is unwise to expect values other than multiples of 90 to work.
csi
(Unimplemented) The height of characters in inches.
err
(Unimplemented) The degree of error reporting desired.
fg
The color to be used for the foreground of plots.
This colors is used for things like axes and annotation.
A description of how colors are specified is given below.
fig
A numerical vector of the form c(x1,x2,y1,y2) which gives
the (NDC) coordinates of the figure region in the display region
of the device.
fin
A numerical vector of the form c(x,y) which gives
the size of the figure region in inches.
font
(Unimplemented) An integer which specifies
which font to use for text.
lab
A numerical vector of the form c(x,y,len) which
modifies the way that axes are annotated.
The values of x and y give the (approximate)
number of tickmarks on the x and y axes and
len species the label size.
(Currently len is ignored).
las
(Unimplemented)
the style of axis labels.
0=always parallel to the axis,
1=always horizontal,
2=always perpendicular to the axis.
lty
The line type.
Line types can either be specified as integers (1=solid, 2=dashed, 3=dotted
4=dotdashed) or as character strings.
The strings may be one of "solid", "dashed", "dotted"
or "dotdashed".
Alternatively, a string of up to 8 characters may be given, giving
the length (in points) of line segments which are
alternatively drawn and skipped.
For example, "44" is dashed and "13" is dotted.
mai
A numerical vector of the form c(xb,xt,yl,yr)
which gives the margin size specified in inches.
mar
A numerical vector of the form c(xb,xt,yl,yr)
which gives the
lines of margin to be specified on the four sides of the plot.
The default is c(5,4,4,2)+0.1.
mex
mex is a character size expansion factor
which is used to describe coordinates in the margins of plots.
mfcol
This is a vector of the form c(r,c).
Subsequent figures will be drawn in an r-by-c
array on the device by columns.
mfg
A numerical vector of the form c(i,j,r,c) where
i and j indicate which figure in an r-by-c
array of figures is currently being drawn.
mfrow
This is a vector of the form c(nr,nc).
Subsequent figures will be drawn in an r-by-c
array on the device by rows.
mgp
The margin line for the axis title, axis labels and axis line.
The default is c(3,1,0).
mkh
The height in inches of symbols to be drawn when
the value of pch is an integer.
oma
A vector of the form c(xb,xt,yl,yr) giving
the size of the outer margins in lines of text.
omd
A vector of the form c(x1,x2,y1,y2) giving the
NDC coordinates of the region where (multiple) figures
will appear on the device.
omi
A vector of the form c(xb,xt,yl,yr) giving
the size of the outer margins in inches.
pch
Either an integer specifying a symbol or a single character
to be used as the default in plotting.
pin
The width and height of the current plot in inches.
plt
A vector of the form c(x1,x2,y1,y2) giving the
the coordinates of the plot region as fractions of the
current figure region.
pty
A character specifying the type of plot region to be used;
"s" generates a square plotting region and
"m" generates the maximal plotting region.
smo
(Unimplemented) a value which indicates
how smooth circles and circular arc should be.
srt
The string rotation in degrees.
Causes srt to be set to the same value.
tck
The length of tick marks as a fraction of the smaller of
the width or height of the plotting region.
If tck=1, grid lines are drawn.
The default value is -0.2.
tmag
A number specifying the enlargement of text of the main title
relative to the other annotating text of the plot.
usr
A vector of the form c(x1,x2,y1,y2) giving the extremes
of the user coordinates of the plotting region.
xaxp
A vector of the form c(x1,x2,n) giving
the coordinates of the extreme tick marks and the number
of intervals between tick-marks.
xaxs
(Unimplemented) The style of axis interval calculation
to be used for the x-axis.
xaxt
A character which specifies the axis type.
Specifying "n" causes an axis to be set up, but not plotted.
xlog
A logical value. If true a logarithmic scale is used.
The default is to use a linear scale.
xpd
A logical value.
If false, all plotting is clipped to the plot region.
yaxp
A vector of the form c(y1,y2,n) giving
the coordinates of the extreme tick marks and the number
of intervals between tick-marks.
yaxs
(Unimplemented) The style of axis interval calculation
to be used for the y-axis.
yaxt
A character which specifies the axis type.
Specifying "n" causes an axis to be set up, but not plotted.
ylog
A logical value. If true a logarithmic scale is used.
The default is to use a linear scale.
Color Specification
Colors can be specified in three different ways.
The simplest way is with a character string giving the
color name (eg. "red").
A list of the possible colors can be obtained with the
function colors.
Alternatively, a color can be specified by giving
an index into a (user definable) table of colors.
Finally, colors can be specified directly with one of the functions
rgb, hsv or gray.
Line Type Specification
Line types can either be specified by giving an index
into a small built in table of line types (1=solid, 2=dashed, 3=dotted)
or directly as the lengths of on/off stretches of line.
This is done with a string of up to eight characters which give
the lengths in consecutive positions in the string.
For example, the string "33" specifies three pixels on followed
by three off and "3313" specifies three pixels on followed
by three off followed by one on and finally three off.