The Julia Language

There's a post going around on Twitter for how to write a super fast DFA, e.g. for UTF8 validation: https://twitter.com/_rsc/status/1413843059972923394?s=19. We have a UTF8 validation function, so we should try this technique. Should be reasonably simple to do.

In recent versions (can't say from exactly when), there seems to be an off-by-one error in dcc.DatePickerRange. I set max_date_allowed = datetime.today().date(), but in the calendar, yesterday is the maximum date allowed. I see it in my apps, and it is also present in the first example on the DatePickerRange documentation page.

E

Reproduce: add using Git_jll cell to the notebook, execute it. The package doesn't get added, and errors appear in the console:

┌ Warning: PlutoPkg: Failed to add/remove packages! Resetting package environment...
│   PLUTO_VERSION = v"0.15.1"
│   VERSION = v"1.6.1"
│   old_packages =
│    1-element Vector{String}:
│     "Git_jll"
│   new_packages =
│    1-element Vector{String}:
│ 

Motivated by https://discourse.julialang.org/t/getting-started-mip-variables-and-datastructure/63766/6

It would be nice to have

model = Model()
@variable(model, x[i=1:3], name="x_$(i)")

Currently there is

model = Model()
julia> @variable(model, x[i=1:3], base_name="x_$(i)")
3-element Vector{VariableRef}:
 x_1[1]
 x_2[2]
 x_3[3]

which isn't quite the sam

Details

(This is related to JuliaPlots/Plots.jl#1706)

For example scatter(skipmissing([1.0, 2.0, missing, 1.0])) fails with Cannot convert Base.SkipMissing{Vector{Union{Missing, Float64}}} to series data for plotting.

Generally skipmissing is not required but it seems odd to see this fail.

Also I stumbled on this while trying to make a histogram, e.g.

I found that function mod2pi is not implemented yet, but mod works. Is there any list of implemented functions? Minimal working example is:

using Zygote

# This is working
gradient(x -> mod(x, 2pi), 1.)

# This is not
gradient(x -> mod2pi(x), 1.)

From here: http://makie.juliaplots.org/stable/plotting_functions/heatmap.html#MakieCore.heatmap there is really no info, e.g. how to choose colormap, how to set color range.

In Exercises 10.1, the outer product in Take the outer product of a vector v with itself and assign it to variable cross_v should be cross product.