Reusing function names keeps potting "old" function

[denglerchr]

`t = linspace(0, 10, 100)
f(x) = x
plot(t, f); gui()
print("Press Enter for 2nd plot"); readline()

now i want a quadratic plot

f(x) = x^2
plot(t, f); gui()`

Hello, i keep having troubles when redefining functions and plotting them. The plot function does not seem to realise the redefinition and keeps plotting the "old" function. E.g. in the example above, the linear function is plotted twice, instead of the quadratic plot. I'm using Julia 0.5.0 and Plots 0.9.3

[denglerchr]

Oh boy, my code got destroyed, here again safe mode for better copy paste:

t = linspace(0, 10, 100)
f(x) = x
plot(t, f); gui()
print("Press Enter for 2nd plot"); readline()

f(x) = x^2
plot(t, f); gui()

[KristofferC]

This is not Plots fault:

JuliaLang/julia#18076
JuliaLang/julia#265

etc. For some reason this got worse on 0.5.

[tbreloff]

Yeah that's weird... I can reproduce. Note that if you don't do that first plot command then the second plot works. Glad to hear it's not my fault :)

[ChrisRackauckas]

Yeah, it's a Base thing. It also messes up on conditionals:

JuliaLang/julia#16965
JuliaLang/julia#15602

It's because of how they changed function compilation in v0.5. The easy answer is, if you want to overwrite f, just make it an anonymous function.

f = (x) -> x^2

Then you can overwrite it without worry. In v0.5, anonymous functions compile so there's no performance loss by doing this.