Docs for solving the heat equation: extract solution

[ggebbie]

Describe the bug 🐞

When running the Solving the Heat Equation example in the docs, I got errors when trying to extract the solution.

Expected behavior

I expected to be able to run the provided code without error. I made some adjustments to extract the code (see snippet of code below).

Minimal Reproducible Example 👇

A snippet of the full code:

# Plot results and compare with exact solution
#discrete_x = sol[x] # didn't work
grid = get_discrete(pdesys, discretization)
discrete_x = grid[x]

#discrete_t = sol[t] # didn't work
discrete_t = sol.t # works

#solu = sol[u(t, x)] # didn't work
solu = sol.u[u(t, x)]

Error & Stacktrace ⚠️
Error related to issymbollike.

Environment (please complete the following information):

• Output of using Pkg; Pkg.status()

  [717857b8] DSP v0.7.9
  [31c24e10] Distributions v0.25.104
⌅ [5b8099bc] DomainSets v0.6.7
  [634d3b9d] DrWatson v2.13.0
  [09f84164] HypothesisTests v0.11.0
  [94925ecb] MethodOfLines v0.10.4
  [961ee093] ModelingToolkit v8.75.0
  [85f8d34a] NCDatasets v0.14.0
  [1dea7af3] OrdinaryDiffEq v6.67.0
  [f0f68f2c] PlotlyJS v0.18.11
  [91a5bcdd] Plots v1.39.0
  [1986cc42] Unitful v1.19.0
Info Packages marked with ⌅ have new versions available but compatibility constraints restrict them from upgrading. To see why use `status --outdated`

• Output of using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)

 ERROR: UndefVarError: `PKGMODE_MANIFEST` not defined

• Output of versioninfo()

Julia Version 1.10.0
Commit 3120989f39b (2023-12-25 18:01 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
 

Additional context

Add any other context about the problem here.

[rjku]

Thank you for posting this issue.
I stumbled upon it, too.
—Riccardo

[cmhyett]

We've been actively working to remedy the issymbollike issue in PR #346.

[musoke]

Is this solved? I see that the potential fix @cmhyett mentioned is merged.

[ggebbie]

This problem is solved when updating the package today. Great!

I can close the issue if that's ok with everyone.

My environment that works contains the following:

  [717857b8] DSP v0.7.9
⌃ [31c24e10] Distributions v0.25.104
⌅ [5b8099bc] DomainSets v0.6.7
⌃ [634d3b9d] DrWatson v2.13.0
  [38e38edf] GLM v1.9.0
  [09f84164] HypothesisTests v0.11.0
  [b964fa9f] LaTeXStrings v1.3.1
  [94925ecb] MethodOfLines v0.10.6
  [961ee093] ModelingToolkit v8.75.0
⌃ [85f8d34a] NCDatasets v0.14.0
⌃ [1dea7af3] OrdinaryDiffEq v6.68.2
⌃ [f0f68f2c] PlotlyJS v0.18.11
⌃ [91a5bcdd] Plots v1.39.0
  [1986cc42] Unitful v1.19.0

[ggebbie]

closing