Stacked Plots (lines) Help

Specific Domains Visualization
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1

Hi all!
I’m trying to make a stacked plot from the Data Below

when I plot using the regular plot function, i got the correct values/positions, but i need then stacked. Using areaplot instead of plot is not working as expected.

Anyone could tell what I’m doing wrong???
Thanks in advance!!!

x = [0 0 0; 1 3 5; 4 8 7; 10 10 10]
y = [0 0 0; 7 8 9; 0 0 0; 0 0 0]
plot(x,y, seriescolor = [:red :green :blue], seriestype = :steppost) #g1
areaplot(x,y, seriescolor = [:red :green :blue], fillalpha = 0.3, seriestype = :steppost) #g2

Plot X Areaplot
Plot X Areaplot1152×386 14.4 KB

2

For stacked area plots, I think we need multiple y-series to be plotted against a common x-axis support. Each series is a column of the y-matrix and should have same length as the support vector x.

3

Fyi, a workaround to get what you want would be to superpose the individual area plots:

x = [0 0 0; 1 3 5; 4 8 7; 10 10 10]
y = [0 0 0; 7 8 9; 0 0 0; 0 0 0]

colors = [:red :green :blue]
p = plot()
[areaplot!(x, y, c=c, fa=0.3, st=:steppost) for (x,y,c) in zip(eachcol(x),eachcol(y),colors)]
p

Plots_area_plots_superposed
Plots_area_plots_superposed3600×2400 59.3 KB

4

Hi Rafael, thanks for helping here!

Maybe i wasnt clear about what i was trying to do. I would like a plot more like the one in link bellow from julia plot documentation, stacked. The shaded area are a great visual but not needed here.

For example, at x = 3 red curve has value 7 and the green one has value 8, it should be 15 in the graphic 7(red) + 8(green). At x = 4, the plot should back to 8 value as red function “has ended” but green is still on.

I could recreate this 3 curves with shared/sync x axis but it will cost memory allocation. The original data had lenght of 288, for each curve. Then i found the attribute “seriestype = :steppost” and it lowered from 288 to 4. The end application should be embedded somewhere, so less memory less final cost.
https://docs.juliaplots.org/latest/gallery/gr/generated/gr-ref058/#gr_ref058

5

As per my first reply, for stacked area plots, all series need to have the same support along the x-axis, which is not the case with your input data.

The simplest thing to do is perhaps to interpolate all series at all distinct x-axis values.

6

One way using Interpolations.jl:

using Interpolations, Plots

x = Float64[0 0 0; 1 3 5; 4 8 7; 10 10 10]
y = Float64[0 0 0; 7 8 9; 0 0 0; 0 0 0]

x0 = sort(unique(x))
ns = size(y,2)
y0 = zeros(length(x0), ns)
for (i,xi,yi) in zip(1:ns, eachcol(x), eachcol(y))
    itp = LinearInterpolation(xi, yi)
    y0[:,i] .= itp(x0)
end

areaplot(x0, y0)

Plots_areaplot_interpolated_and_stacked
Plots_areaplot_interpolated_and_stacked3600×2400 142 KB

1 Like
7

Nice example! I could figure out how to do the right stack plot. Didn’t have to use Interpolations.jl at all, and final result (x0, y0) are smaller than original problem.

Final code:

        x = [0 0 0; 1 3 5; 4 8 7; 10 10 10]
        y = [7 8 9]

        x0 = sort(unique(x))
        y0 = zeros(length(x0), length(y))

        for j in eachindex(y)
            for i in eachindex(x0)
                if x0[i] ≥ x[2,j] && x0[i] < x[3,j]
                    y0[i,j] = y[j]
                end
            end
        end

        p =areaplot(x0, y0, fa=0.3, st=:steppost, seriescolor = [:red :green :blue])
        display("image/png", p)

Stacked_Plot_Final

1 Like
8

To get more accurate answers, it helps to define the problem in the same way.

From the input data provided, hey, it’s a free land:

input_data_plot
input_data_plot1115×734 56.6 KB