The Julia Language

Looking for ";" in the help REPL shows a docstring that describes its use as the end of statement and as output suppressor but it doesn't mention its use as a separator between positional and keyword arguments in function definitions and calls, nor about its role for building arrays or about its usage to access the shell REPL mode.
This is the same in v1.6 and master (August 8 2021).

hel

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

I had hoped I wouldn't need to delete a cell if I wanted to test an alternate way of computing a result, but even if I disable one of the two versions, I can't run the other b/c of the error message "Multiple definitions." It would be handy to have this work.

The same user as #2662 asked for ways to solve a collection of problems over a set of parameters. We don't have a good way of doing this in JuMP (we have @NLparameter, but not @parameter), but it could be scripted using the modification API (or even just rebuilding the problem).

We should write a tutorial with the different approaches. Here's their suggestion:

![image](https://user-image

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.)

The following code gives a segfault with Makie 0.15 and Julia 1.6.1 (also reproduced with 1.7-beta2):

using Makie

xs = range(150, 160, length=100)
ys = range(7, 9, length=100)
points = [(x, y, 0.0) for x in xs for y in ys]
x, y, z = map(i -> getindex.(points, i), 1:3)

flags = (153 .< x .< 153.5) .& (7 .< y .< 7.3)
surface(y[flags], x[flags], z[flags]);

Starting Julia

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.

The basics of DiscreteSystem exists now, but the little details around it need to be finished.