Instantiate does not instantiate?

General Usage
1

I’m playing with some student code, and the following is happening: while there is a Manifest.toml file and it seems to contain all the packages, instantiate does nothing:

shell> ls
 config.jl       'ddt_polipart!.jl'   geradist.jl     Manifest.toml   Project.toml   Run_polipart.jl   Solve_BV2.jl
 Configsimul.jl  'ddt_regsol_4!.jl'   jacpattern.jl   Mataux.jl       projeto_1D     Salvasimul.jl    'Solve_BV!.jl'

shell> grep DifferentialEquations Manifest.toml
[[deps.DifferentialEquations]]

(projeto_1D) pkg> instantiate

julia> using DifferentialEquations
 │ Package DifferentialEquations not found, but a package named DifferentialEquations is available from a registry. 
 │ Install package?
 │   (projeto_1D) pkg> add DifferentialEquations 
 └ (y/n/o) [y]: n
ERROR: ArgumentError: Package DifferentialEquations not found in current path.
- Run `import Pkg; Pkg.add("DifferentialEquations")` to install the DifferentialEquations package.

What may be happening here?

The Project.toml file seems fine as well.

2

Is DifferentialEquations listed as a direct dependency in Project.toml? That error has nothing to do with Manifest.toml or instantiation.

1 Like
3

The code is not mine, so I will answer you in a private message to add further info. But for that specific question the answer is yes, it is listed.

I think the problem is somehow related to uppercase, lowercase, or underscore characters, as the code came from a Windows machine. I have reorganized the directory structure and now it is working, but there may be an underlying issue there.

4

Oh, no, I see what was going on. The script of the student started with

import Pkg; Pkg.activate("ProjectName")

but when coding from VSCode, ProjectName was already active, such that that first line of the script created a subproject, and that messed up everything when it came to executing stuff.

5

If the intention is to activate the project in the same directory as the script, I’d strongly recommend doing Pkg.activate(@__DIR__).

2 Likes