deldir (version 2.0-4)

print.tileInfo: Print a summary of tile information.

Description

Print a reasonably readable summary of an object of class tileInfo as produced by the tileInfo() function.

Usage

# S3 method for tileInfo
print(x, digits = 4, npl = 6, ...)

Value

None.

Arguments

x

An object of class tileInfo as produced by the tileInfo() function.

digits

Integer scalar. The (maximum) number of decimal digits to which the output is to be printed.

npl

Integer scalar. “Number per line”. It specifies the (maximum) number of values per line. Used (only) when printing the edge lengths component of x. It effects a tidy “folding” of the printed vector of edge lengths of the tile associated with a given point. If you increase the value of digits you may wish to decrease the value of npl, and vice versa.

...

Not used. Present for compatibility with the generic print() function.

Author

Rolf Turner

Details

The list produced by tileInfo() is a bit messy and hard to comprehend, especially if there is a large number of tiles. This print method produces a screen display which is somewhat more perspicuous.

There are four components to the display:

• A list, each entry of which is the vector of edge lengths of the tile. Each edge length is formatted to have a number of digits specified by the digits argument. Each list entry may be displayed over a number of lines. The first of these lines is prefixed by an “informative” string indicating the point that determines the tile whose edge lengths are being printed. The string is formed from the identifier of the point. See deldir(), plot.deldir() and getNbrs(). The identifier may consist essentially of the index of the point in the sequence of points that is being tessellated.

  Succeeding lines, corresponding to the same list entry, are prefixed with a number of blanks so as to produce an aesthetically pleasing alignment.

• A table of the edge counts of the tiles.

• A simple print out of the areas of the tiles (rounded to a maximum of digits decimal digits).

• A simple print out of the perimeters of the tiles (rounded to a maximum of digits decimal digits).

This screen display is for “looking at” only. In order to do further calculations on the output of tileInfo it is necessary to delve into the bowels of x and extract the relevant bits.

See Also

tileInfo()

Examples

set.seed(179)
x    <- runif(100)
y    <- runif(100)
dxy  <- deldir(x,y,rw=c(0,1,0,1))
ixy1 <- tileInfo(dxy)
print(ixy1)
ixy2 <- tileInfo(dxy,bndry=TRUE)
print(ixy2)
if(require(polyclip)) {
    CP <- list(x=c(0.49,0.35,0.15,0.20,0.35,0.42,
                   0.43,0.62,0.46,0.63,0.82,0.79),
               y=c(0.78,0.86,0.79,0.54,0.58,0.70,
                   0.51,0.46,0.31,0.20,0.37,0.54))
    ixy3 <- tileInfo(dxy,clipp=CP)
    options(width=120) # And enlarge the console window.
    print(ixy3) # 33 tiles are retained.
    print(ixy3$perimeters$perComps) # The tiles for points 9 and 94 have
                                    # been split into two components.
}