coordinates of elements on a plot

estimates coordinates of elements, neatly arranged on a plot.

coordinates(pos = NULL, mx = 0.0, my = 0.0, N = length(pos), 
            hor = TRUE, relsize = 1)

Arguments

pos

vector specifying the number of elements in each row, or 2-columned matrix with element position, or NULL.

mx

horizontal shift (x).

my

vertical shift (y).

N

total number of elements to be positioned - only if pos=NULL.

hor

only if pos is a 2-columned matrix. In this case, when hor = TRUE, pos specifies number of elements per row; when FALSE per column.

relsize

scaling factor as a function of graph size.

Value

2-columned matrix, with coordinates (x,y) of each of the elements

Author

Karline Soetaert <karline.soetaert@nioz.nl>

Details

the position of the elements are specified with pos, which is either NULL, or a vector specifying the number of elements on a row, or a 2-columned matrix specifying the (x,y) position of each element.

• when pos is NULL, the elements will be arranged on a circle; in this case, the number of elements to be positioned must be specified with N.

• when pos is a vector, it specifies the number of elements in each row (if hor =TRUE) or in each column (if hor = FALSE).

  For instance, with hor=TRUE and pos = c(3,2,1) the elements will be arranged in 3 rows (length of vector); on the top row 3 elements; on the second row 2; and on the third row 1 element will be positioned. All elements within a row are equally distributed horizontally; all rows are equally distributed vertically;

• when pos is a matrix, it specifies the x(1st column) and y(2nd column) position of each element and is returned as such.

The offset from the x-axis and from the y-axis can be changed with mx and my.

Examples

openplotmat(main = "coordinates")

text(coordinates(N = 6), lab = LETTERS[1:6], cex = 2)

text(coordinates(N = 8, relsize = 0.5), lab = letters[1:8], cex = 2)


openplotmat(main = "coordinates")

text(coordinates(pos = c(2, 4, 2)), lab = letters[1:8], cex = 2)


plot(0, type = "n", xlim = c(0, 5), ylim = c(2, 8), main = "coordinates")

text(coordinates(pos = c(2, 4, 3), hor = FALSE), lab = 1:9, cex = 2)