PyPlot: LineCollection help needed

[NotSoRecentConvert]

I'm trying to do a plot using LineCollection in PyPlot however am having a hard time converting an example (1 or 2).

lines = Any[Any[[1.0 2.0]];Any[[3.0 4.0]];Any[[5.0 .06]];Any[[0.0 0.0]]] # Points
c = Any[Any[1 0 0];Any[0 1 0];Any[0 0 1]] # Color

line_segments = matplotlib[:collections][:LineCollection](lines,colors=c)

fig = figure("Line Collection Example")
ax = axes()
ax[:add_collection](line_segments)
axis("tight")

It doesn't return an errors but I don't see any lines. Any idea what could be wrong?

[David P. Sanders]

Does it work with ax=gca() instead?

[Christoph Ortner]

seems not.

[David P. Sanders]

After looking at some matplotlib examples, it seems that the data structure needed by LineCollection in Python

is a list of lists, with the inner lists being lists of (x,y) pairs. 

After playing around for a while, the following works for me

for drawing a pair of lines in Julia:

xs = [1., 3., 5., 0.]

ys = [2., 4., .06, 0.]

lines = Any[collect(zip(xs, ys))]

xs = [3., 4]

ys = [5., 6]

push!(lines, collect(zip(xs, ys)))

#lines = Vector{Float64}[[1.0, 2.0], [3.0 4.0], 5.0 .06]];Any[[0.0 0.0]]] # Points

#c = Any[Any[1 0 0];Any[0 1 0];Any[0 0 1]] # Color

c = Vector{Int}[[1,0,0], [0,1,0], [0,0,1]]

line_segments = matplotlib[:collections][:LineCollection](lines, colors=c)

fig = figure("Line Collection Example")

ax = gca()

ax[:add_collection](line_segments)

axis("image")

[Christoph Ortner]

thanks, David, this will be useful for me as well! C

[Tom Breloff]

David: Thanks so much for saving me a ton of headache figuring this out for Plots.  Just pushed to dev:

```

using Plots

y = cumsum(randn(500))

plot(y, line_z = y, w = 3)

```

​

[David P. Sanders]

Great stuff, Tom!