Julia plotting unknown number of layers in Gadfly

Question

I'm trying to create a plot in Julia (currently using Gadfly but I'd be willing to use a different package). I have a multidimensional array. For a fixed dimension size (e.g. 4875x3x3 an appropriate plot would be: ``` p=Gadfly.plot( layer(y=sim1.value[:,1,1],x=[sim1.range],Geom.line, Theme(default_color=color("red"))), layer(y=sim1.value[:,1,2],x=[sim1.range],Geom.line, Theme(default_color=color("blue"))), layer(y=sim1.value[:,1,3],x=[sim1.range],Geom.line, Theme(default_color=color("green"))) ) ``` but in general I want to be able to write a plot statement where I do not know the third dimension of the sim1.value array. How can I write such a statement? perhaps something like: ``` p=Gadfly.plot([layer(y=sim1.value[:,1,i],x=[sim1.range], Geom.line, Theme(default_color=color("red"))) for i in 1:size(sim1)[3]]) ``` but this doesn't work. I was able to solve this problem by reshaping the array into a dataframe and adding a column to indicate what the third dimension is, but I was wonderi…

Accepted Answer

Apparently "splatting", if that's the correct term, works here. Try:

```
p=Gadfly.plot([layer(y=sim1.value[:,1,i],x=[sim1.range], Geom.line, Theme(default_color=color("red"))) for i in 1:size(sim1)[3]]...)
```

For different layer colors, this is just a guess/hack (feel free to edit for correctness).

```
p=Gadfly.plot([layer(y=sim1.value[:,1,i],x=[sim1.range], Geom.line, Theme(default_color=color(["red" "blue" "green" "cyan" "magenta" "yellow"][i%6+1]))) for i in 1:size(sim1)[3]]...)
```

Perhaps one of Gadfly's `Scale` color parameters would help here.

Addendum:

See first comment below for color selection method.

Julia plotting unknown number of layers in Gadfly

Solution

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