````julia
using Gadfly
x = range(0, stop=2π, length=200)
plot(x=x, y = sin(x), Geom.line)
````


![sin(x) function.][figures/gadfly_formats_test_sin_fun_1.png]

[figures/gadfly_formats_test_sin_fun_1.png]: figures/gadfly_formats_test_sin_fun_1.png 

![cos(x) function.][figures/gadfly_formats_test_2_1.png]

[figures/gadfly_formats_test_2_1.png]: figures/gadfly_formats_test_2_1.png 

![][figures/gadfly_formats_test_cos2_fun_1.png]

[figures/gadfly_formats_test_cos2_fun_1.png]: figures/gadfly_formats_test_cos2_fun_1.png 

````julia
julia> x = range(0, stop=2π, length=200)
200-element LinSpace{Float64}:
 0.0,0.0315738,0.0631476,0.0947214,0.126295,…,6.18846,6.22004,6.25161,6.28319

julia> plot(x=x, y = sin(x), Geom.line)
Plot(...)

````


![][figures/gadfly_formats_test_4_1.png]

[figures/gadfly_formats_test_4_1.png]: figures/gadfly_formats_test_4_1.png 

````julia
julia> y = 20
20

julia> plot(x=x, y = cos(x), Geom.line)
Plot(...)

````


![][figures/gadfly_formats_test_4_2.png]

[figures/gadfly_formats_test_4_2.png]: figures/gadfly_formats_test_4_2.png 

````julia
x = range(0, stop=2π, length=200)
plot(x=x, y = sin(x), Geom.line)
````


![][figures/gadfly_formats_test_5_1.png]

[figures/gadfly_formats_test_5_1.png]: figures/gadfly_formats_test_5_1.png width=15cm

````julia
y = 20
plot(x=x, y = cos(x), Geom.line)
````


![][figures/gadfly_formats_test_5_2.png]

[figures/gadfly_formats_test_5_2.png]: figures/gadfly_formats_test_5_2.png width=15cm