How to draw function returning elements of an array using gadfly

Question

Hello i am trying to draw a function with Gadfly using Julia. I have no problem with function like this:

function F(x)
   return x+5
end

I use plot(F,1,10) and it works. Unfortunately for this function which is returning elements of an array it doesn't work:

function F(x)
   return myArray[x]
end

I would be grateful for telling me where it goes wrong.

Answer 1

If you want to create an Index-Value plot of myArray elements I think the correct usage is:

plot(y=myArray,x=1:10)

and if you want to create a piecewise continuous plot, then declaration of f(x) should be something like this:

function F(x::Float64)
   global myArray
   return myArray[floor(Int,x)] # or myArray[round(Int,x)] or myArray[ceil(Int,x)]
end