contourLines {grDevices} | R Documentation |
Calculate contour lines for a given set of data.
contourLines(x = seq(0, 1, length.out = nrow(z)),
y = seq(0, 1, length.out = ncol(z)),
z, nlevels = 10,
levels = pretty(range(z, na.rm=TRUE), nlevels))
x , y |
locations of grid lines at which the values in |
z |
a matrix containing the values to be plotted ( |
nlevels |
number of contour levels desired iff
|
levels |
numeric vector of levels at which to draw contour lines. |
contourLines
draws nothing, but returns a set of contour lines.
There is currently no documentation about the algorithm. The source code is in ‘R_HOME/src/main/plot3d.c’.
A list of contours. Each contour is a list with elements:
level |
The contour level. |
x |
The x-coordinates of the contour. |
y |
The y-coordinates of the contour. |
options("max.contour.segments")
for the maximal
complexity of a single contour line.
contour
.
x <- 10*1:nrow(volcano)
y <- 10*1:ncol(volcano)
contourLines(x, y, volcano)