Use Plots() library to graph a colored surface

General Usage
8

My environment is Windows 10 with

using Pkg
println("Julia v", VERSION)
Pkg.status("IJulia")
Pkg.status("PyCall"; mode = PKGMODE_MANIFEST)
Pkg.status("Plots")
Pkg.status("PyPlot")
Pkg.status("Plotly")
Pkg.status("StaticArrays")
Pkg.status("Parameters")

↓

Julia v1.6.2
      Status `D:\.julia\environments\v1.6\Project.toml`
  [7073ff75] IJulia v1.23.2
      Status `D:\.julia\environments\v1.6\Manifest.toml`
  [438e738f] PyCall v1.92.3
      Status `D:\.julia\environments\v1.6\Project.toml`
  [91a5bcdd] Plots v1.20.1
      Status `D:\.julia\environments\v1.6\Project.toml`
  [d330b81b] PyPlot v2.9.0
      Status `D:\.julia\environments\v1.6\Project.toml`
  [58dd65bb] Plotly v0.4.0
      Status `D:\.julia\environments\v1.6\Project.toml`
  [90137ffa] StaticArrays v1.2.12
      Status `D:\.julia\environments\v1.6\Project.toml`
  [d96e819e] Parameters v0.12.2

I use Plots.jl v1.20.1 installed in the directory

D:\.julia\packages\Plots\HcxwM

But your Plots.jl directory is

C:\Users\Hermesr\.julia\packages\Plots\hyS17

Your hyS17 is not equal to my HcxwM.

Probably you are using an older version of Plots.jl due to conflicts with other packages.

First, upgrade installed packages by

pkg> up

and check if Plots.jl is upgraded to version ≥ v1.20.1 or not.

If not, restart Julia in an empty directory and run

pkg> activate .
pkg> add Plots
pkg> status

Confirm the version of Plots.jl is ≥ v1.20.1. Then try to run my code.

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