Plotly/PlotlyJS behavior when linecolor is a vector

[wkearn]

I haven't fixed rgba_string here:

Plots.jl/src/backends/plotly.jl

Line 637 in 09c5e8a

:color => rgba_string(series[:linecolor]),

because I'm not entirely sure what

plot(randn(10,2),color=[:blue,:red])

should do. This will currently still cause an error for Plotly/PlotlyJS.

GR just outputs two blue lines:

If I try to apply my previous fix (#1324) to this line, you end up with

Note that

1. This is different from what GR gives
2. The colors here are not blue and red, nor are they the default colors. I'm not entirely sure where they're coming from.

[apalugniok]

Sorry I misunderstood the issue so I deleted my previous comment which no longer made sense 😆

EDIT: I think it should either error or give what GR currently gives. Since you can't really color a line elementwise. You could stop the error by doing _cycle(series[:linecolor],1) which I think would be the best solution.

[mkborregaard]

I think this should ideally error with an informative error message asking the user if maybe they wanted to pass a 1-row Matrix

[wkearn]

I would tend to agree that this should error helpfully. Rather than updating each of the backends to error where Plotly currently does, it's probably a better idea to fail earlier in the pipeline when we can first detect that linecolor is a column rather than a row vector. I'll look into that and come up with a pull request.