missing values

[xiaodaigh]

Gadfly.plot(x = [missing, 1, 2], y = [missing, 3, 4], Geom.point)

doesn't seem to plot. I think it would be a good idea to introduce a new way to deal with missings, e.g. not plot them and give a warning.

[Mattriks]

Missing values have had a troubled history in Julia itself. There was NA in DataArrays and Nullable in Julia 0.4. The new missing (Julia 0.7/1.0) is the first stable implementation of missing values in Julia. See my #1083 (comment) and the previous posts for more history! And this Julia blog post.

[bjarthur]

replacing missing with NaN in your example is the workaround. might be easy to fix the code if one follows the treatment of NaNs and then adds logic for missing accordingly.

[Mattriks]

With Gadfly#master (Gadfly 1.3+), Geom.point and Geom.line will work with missing values. Other geometries may or may not work, will fix on a geom-by-geom basis!