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The documentation for geom_contour
says:
Contouring
tends to work best when \code{x} and \code{y} form a (roughly) evenly
spaced grid.
but in fact, as issue #4320 and its discussion describes, there are much more stringent requirements. Exactly what the requirements are is a little unclear to me; the code to do it is in isoband_z_matrix()
here:
Line 224 in 9741da5
(x, y)
pairs to be a large subset of the grid of all possible pairs of unique values of x
and y
, with no repeats."
It would also be helpful to add an example using akima::interp()
, the usual way to produce the grid of values from irregular data.
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