It is quite strange that with the following code N = 10 M = 10 dim = binomial(N+M-1, M-1) basis=zeros(Int8, M, dim) basis[1,1]=N s=1 while basis[M,s]<N s1=M-1 while basis[s1,s]==0 s1=s1-1 end basis[1:s1-1,s+1]=basis[1:s1-1,s] basis[s1,s+1]=basis[s1,s]-1 basis…

[image] jiang_ming_zhang: but what is wrong with this line? No one said there’s anything wrong with it…

Expanding on @Benny ’s answer, which gives the solution to tell that the global variable s is the “counting variable” used inside the loop: If the code you posted was part of the body of a function, the loop would work as you expected, for the reasons explained in the section of the manual linked ab…

Here’s another fix using let to create a local scope. let N = 10 M = 10 dim = binomial(N+M-1, M-1) basis=zeros(Int8, M, dim) basis[1,1]=N s=1 while basis[M,s]<N s1=M-1 while basis[s1,s]==0 s1=s1-1 end basis[1:s1-1,s+1]=basis[1:s1-1,s] basis[s1,s+1]=basis[s1,s]-1 ba…

I too find it frustrating too use global for simple scripts. I had read about a workaround on discourse but cannot find it now. I had to figure it using the SoftGlobalScope.jl package. Suppose you have a Julia file named tryscope.jl s = 0.0 for i = 1:10 s = s+1 end println(s) In order to ru…

why is ‘basis’ not treated as a global variable? It is also defined outside of the for loop.

If you encapsulate everything into a function, you can use Revise and that gives you a very convenient workflow in Julia: file test.jl, containing: function compute_basis(;N=10, M=10) dim = binomial(N+M-1, M-1) basis=zeros(Int8, M, dim) basis[1,1]=N s=1 while basis[M,s]<N s1=M-1 …

[image] A_C: I too find it frustrating too use global for simple scripts. (Julia is really heavily oriented around putting all non-trivial code into functions. It’s best not to fight the language on this.)

basis, s, N, and everything else defined outside the loop are global variables, meaning they are defined at the topmost level. The line s=s+1 is inside the local scope of the while loop. Here Julia is not sure if you want to use the global s or define a new local s variable, so it throws an error. T…

I should not have used “frustrating”. It is just mildly inconvenient for smaller scripts. I do use functions for codes which are to be maintained for longer time. However, in initial phases when one is doing exploratory coding it is more convenient to have REPL like scoping rules. One of the disadv…

Global variable issue

General Usage

A_C January 3, 2024, 1:39pm 12

This old thread might be helpful.

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Global variable issue

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