Text is written in one of the four margins of the current figure region or one of the outer margins of the device region.
mtext(text, side = 3, line = 0, outer = FALSE, at = NA,
adj = NA, padj = NA, cex = NA, col = NA, font = NA, …)a character or expression vector specifying
the text to be written. Other objects are coerced by
as.graphicsAnnot.
on which side of the plot (1=bottom, 2=left, 3=top, 4=right).
on which MARgin line, starting at 0 counting outwards.
use outer margins if available.
give location of each string in user coordinates. If the
component of at corresponding to a particular text item is
not a finite value (the default), the location will be determined
by adj.
adjustment for each string in reading direction. For
strings parallel to the axes, adj = 0 means left or bottom
alignment, and adj = 1 means right or top alignment.
If adj is not a finite value (the default), the value of
par("las") determines the adjustment. For strings plotted
parallel to the axis the default is to centre the string.
adjustment for each string perpendicular to the reading
direction (which is controlled by adj). For strings parallel
to the axes, padj = 0 means right or top alignment,
and padj = 1 means left or bottom alignment.
If padj is not a finite value (the default), the value of
par("las") determines the adjustment. For strings plotted
perpendicular to the axis the default is to centre the string.
character expansion factor. NULL and NA
are equivalent to 1.0. This is an absolute measure, not
scaled by par("cex") or by setting par("mfrow")
or par("mfcol"). Can be a vector.
color to use. Can be a vector. NA values (the
default) mean use par("col").
font for text. Can be a vector. NA values (the
default) mean use par("font").
Further graphical parameters (see par),
including family, las and xpd. (The latter
defaults to the figure region unless outer = TRUE, otherwise
the device region. It can only be increased.)
The given text is written onto the current plot.
The user coordinates in the outer margins always range from zero to one, and are not affected by the user coordinates in the figure region(s) --- R differs here from other implementations of S.
All of the named arguments can be vectors, and recycling will take place to plot as many strings as the longest of the vector arguments.
Note that a vector adj has a different meaning from
text. adj = 0.5 will centre the string, but for
outer = TRUE on the device region rather than the plot region.
Parameter las will determine the orientation of the string(s).
For strings plotted perpendicular to the axis the default justification
is to place the end of the string nearest the axis on the specified
line. (Note that this differs from S, which uses srt if
at is supplied and las if it is not. Parameter
srt is ignored in R.)
Note that if the text is to be plotted perpendicular to the axis,
adj determines the justification of the string and the
position along the axis unless at is specified.
Graphics parameter "ylbias" (see par) determines
how the text baseline is placed relative to the nominal line.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
title, text, plot,
par;
plotmath for details on mathematical annotation.
# NOT RUN {
plot(1:10, (-4:5)^2, main = "Parabola Points", xlab = "xlab")
mtext("10 of them")
for(s in 1:4)
mtext(paste("mtext(..., line= -1, {side, col, font} = ", s,
", cex = ", (1+s)/2, ")"), line = -1,
side = s, col = s, font = s, cex = (1+s)/2)
mtext("mtext(..., line= -2)", line = -2)
mtext("mtext(..., line= -2, adj = 0)", line = -2, adj = 0)
##--- log axis :
plot(1:10, exp(1:10), log = "y", main = "log =\"y\"", xlab = "xlab")
for(s in 1:4) mtext(paste("mtext(...,side=", s ,")"), side = s)
# }
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