Description Usage Arguments Value Examples
This is a convenient function to generate points with
x and y coordinates (which form a 2-column data.frame).
It is much like expand.grid
. The points generated
by expand.grid
always in this "s" order: the bottom
line, form left to right, and the second line, from left to right.
However, spathxy
allows you choose the order you
want. See examples.
1 2 3 4 5 6 7 8 |
x |
a vector of values to be paired with y. |
y |
a vector of values to be paired with x. |
first |
the first direction. It may be one of "right", "left", "top", "bottom". Default is "right". |
second |
the second direction. It may be one of "right", "left", "top", "bottom". Default is "top". |
change_line |
tail-to-tail or tail-to-head. Default is FALSE which means tail-to-tail. See examples. |
stringsAsFactors |
to be passed to |
always a 3-column data frame. Column x and y are coordinates of points; column index contains the index number of points.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | library(ggplot2)
#
# dat1 is generated by expand.grid
# Note the difference between dat1 and dat2.
# dat3 is the same as dat1.
dat1=expand.grid(1: 3, 1: 7)
colnames(dat1)=c("x", "y")
dat2=spathxy(1: 3, 1: 7,
change_line=FALSE, first="right", second="top")
dat3=spathxy(1: 3, 1: 7,
change_line=TRUE, first="right", second="top")
#
mycolor=rainbow(nrow(dat1), end=0.6)
ggplot(dat1)+geom_path(aes(x, y), color=mycolor, size=3)
ggplot(dat2)+geom_path(aes(x, y), color=mycolor, size=3)
ggplot(dat3)+geom_path(aes(x, y), color=mycolor, size=3)
|
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