How to start a new Julia session from script

General Usage
21

Can you provide me with some documentation for doing this?

22

This seems correct, and a definite improvement from before.

Side note, CSV.read(file) is deprecated. You can do CSV.read(file, DataFrame) to get the data frame directly.

2 Likes
23

Unfortunately, getting rid of the global variables did not solve my problem.

24

Note that Julia does not copy on assignment - any modification to temp_ will also modify the original. You need to explicitly copy arrays:

julia> cost1, cost2 = rand(1), rand(1)
([0.10489078104085436], [0.24938919112321623])

julia> tmp_cost1, tmp_cost2 = cost1, copy(cost2)
([0.10489078104085436], [0.24938919112321623])

julia> tmp_cost1[1] = tmp_cost2[1] = 0
0

julia> cost1, cost2
([0.0], [0.24938919112321623])

This may be what’s causing you to see irregular Guirobi results when doing multiple runs at once: you’re currently modifying your StartUpCost parameter on each iteration.

2 Likes
25

Some other notes:

  • You’ll spare yourself a lot of indexing pain if you use 2D arrays instead of 1D (e.g. test2_limit = zeros(2, num_gp) instead of zeros(1, (2*num_gp)). If you need to treat a 2D array as 1D for some reason, you can easily reshape it using vec(arr), which refers to the same underlying chunk of memory.
  • You don’t need to set global variables as constants if you’re passing them as function arguments. “Dynamic multiple dispatch” means that Julia figures out which methods to call based on a function’s argument types at run-time, but as long as those function arguments have a concrete type, there’s no need to set them as constant.
  • Array{Float64} (as used in your StartUpCost initialization) is not a concrete type, since you didn’t specify the dimension of the array:
julia> isconcretetype(Array{Float64})
false

julia> isconcretetype(Array{Float64, 1})
true
  • Unlike Matlab, Julia has built-in 1D arrays, and “row vectors” like reshape(..., (1, nUnits)) are not considered idiomatic in cases where a 1D array would do the same thing.
  • Multiple function definitions can (and typically do) coexist in the same file - there’s no need to split things across multiple files unless it helps you with code organization.
3 Likes
27

Thanks everyone, the problem has been resolved.

1 Like
28

Thank you, the problem has been resolved.

29

It would be nice if you could change the title so that another person with a similar issue can find this. In the end, the post was not solved by starting new sessions from a script.

1 Like