How can I add to a plot without mutating it in Plots.jl?

New to Julia
,
1

I would like to add to an existing plot p0 without mutating it.
Currently I have to repeat code

using Plots;
xg = 0.01:0.01:10.0;

p0 = plot(xg, sin, legend=:topleft)
p0 = plot!(p0, xg, cos)
p1 = plot!(p0, xg, log)

p0 = plot(xg, sin, legend=:topleft)
p0 = plot!(p0, xg, cos)
p2 = plot!(p0, xg, sqrt)

I want:

using Plots;
xg = 0.01:0.01:10.0;

p0 = plot(xg, sin, legend=:topleft)
plot!(p0, xg, cos)

p1 = plot(p0, xg, log)
p2 = plot(p0, xg, sqrt)
2

Just add more plot commands

       using Plots;
       xg = 0.01:0.01:10.0;
       
       p0 = plot(xg, sin, legend=:topleft)
       plot!(p0, xg, cos)
       
       p1 = plot(p0, plot(xg, log))
       p2 = plot(p0, plot(xg, sqrt))
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3

@pdeffebach that creates a subplot.
I want to add a curve to p0 without mutating it.

4

Oh sorry, I see.

Only thing I could think of was deepcopy. Maybe that’s wrong in some way, though.

julia> begin 
       using Plots;
       xg = 0.01:0.01:10.0;
       
       p0 = plot(xg, sin, legend=:topleft)
       plot!(p0, xg, cos)
       
       p1 = plot!(deepcopy(p0), xg, log)
       end
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5

Issue solved by PR:
https://github.com/JuliaPlots/Plots.jl/issues/3593

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6

Can I ask why it is nice to do it this way compared with just mutating it?

Out of curiosity.

Kind regards

7

The one use case immediately came to my mind is creating a bunch of plots with the same “background”. (As in the OP) One could wrap the background plot generation into a function but recalculation might be more expensive than just copying the plot and using it later.

Edit: typo

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