con2tr) and matrices produced by
predict.loess
(
mat2r) to data frames for use by Trellis.
con2tr(obj) mat2tr(z)
x,
y and
z as passed to
contour
con2tr repeats the
x and
y components suitably to match the
vector
z.
mat2tr constructs
x and
y columns from the
dimnames of
z.