Geom.ribbon in Gadfly (Julia) does not accept Int vectors as input

问题

So, I've been playing around with Gadfly in Julia and run into this issue.

Geom.ribbon does't accept Int vectors as input for ymin and ymax when used in combination with Geom.smooth.

I was wondering if this is a bug, is intended, or if I'm doing anything wrong and why?

In [1]: 
x=[-10:10]
y=[i^2 for i in -10:10]
ymin = y-10
ymax = y+10;

In [2]: 
plot(x=x, y=y, ymin=ymin, ymax=ymax, Geom.smooth, Geom.ribbon)

Out[2]: 
`minvalmaxval` has no method matching minvalmaxval(::Int64, ::Float64, ::Int64, ::Nothing, ::Nothing)

 in apply_statistic_typed at C:\Users\epintos\.julia\v0.3\Gadfly\src\statistics.jl:709
 in apply_statistic at C:\Users\epintos\.julia\v0.3\Gadfly\src\statistics.jl:551
 in apply_statistics at C:\Users\epintos\.julia\v0.3\Gadfly\src\statistics.jl:37
 in render at C:\Users\epintos\.julia\v0.3\Gadfly\src\Gadfly.jl:717
 in writemime at C:\Users\epintos\.julia\v0.3\Gadfly\src\Gadfly.jl:884
 in sprint at iostream.jl:229
 in display_dict at C:\Users\epintos\.julia\v0.3\IJulia\src\execute_request.jl:31

In [3]:
ymin = float64(ymin)
ymax = float64(ymax);

In [4]:    
plot(x=x, y=y, ymin=ymin, ymax=ymax, Geom.smooth, Geom.ribbon)

What's weird is that

plot(x=x, y=y, ymin=ymin, ymax=ymax, Geom.line, Geom.ribbon)

works even if all vectors are Int

回答1:

Its a bug in Gadfly, you can see the line here

function minvalmaxval{T}(minval::T, maxval::T, val, s, ds)

Which requires that minval and maxval have the same type. Relatively easy to fix, you should file an issue. Until it is, your fix is a sensible one.

来源：https://stackoverflow.com/questions/28966555/geom-ribbon-in-gadfly-julia-does-not-accept-int-vectors-as-input

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