Low resolution for contourf

[natefoulk4]

Hello,

When I plot the following,

using Plots
pgfplotsx()
a = 0:0.1:1.0; 
b = 0:0.1:1.0;
contour(a, b, (x,y) -> exp(-(x-0.5)^2 - (y-0.5)^2))
contourf(a, b, (x,y) -> exp(-(x-0.5)^2 - (y-0.5)^2))

, the plots look qualitatively different.

Is this expected? I would love to have nicer looking output for contourf

System info:

Julia Version 1.7.0
Commit 3bf9d17731 (2021-11-30 12:12 UTC)
Platform Info:
  OS: macOS (arm64-apple-darwin21.1.0)
  CPU: Apple M1
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, cyclone)

[8314cec4] PGFPlotsX v1.5.0
[91a5bcdd] Plots v1.25.4

[fhouser]

@natefoulk4
Hi,
you could use heatmap() for the full resolution of your data's range. Or, set the 'levels' attribute in 'contourf': e.g.
contourf(a, b, (x,y) -> exp(-(x-0.5)^2 - (y-0.5)^2), levels = 25)
This will increase the so-called 'resolution'.

On a similar note: How did you manage to set contourf up? I can plot using contour and this backend, but using contourf results in the following error message on my system:

julia> contourf(a, b, (x,y) -> exp(-(x-0.5)^2 - (y-0.5)^2)) Error showing value of type Plots.Plot{Plots.PGFPlotsXBackend}: ERROR: ArgumentError: No tex function available for data of type ColorGradient. Define one by overloading print_tex(io::IO, data::T) where T is the type of the data to dispatch on.