# Sum() syntax

**URL:** <https://discourse.julialang.org/t/sum-syntax/14589>\
**Category:** Optimization (Mathematical)\
**Tags:** jump\
**Created:** [September 5, 2018, 4:30pm UTC](https://discourse.julialang.org/t/sum-syntax/14589 "2018-09-05T16:30:31Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 5, 2018, 4:30pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/1 "2018-09-05T16:30:31Z")

</div>

Hello, from the JuMP quick guide, i’ve seen i can use the `sum()` function with a condition, like this:

`sum(expression for i = I1, j = I2 if cond)`

is the same as:

```julia
a = zero(AffExpr)
for i = I1
    for j = I2
        ...
        if cond
            a += expression
        end
        ...
    end
end

```

Does it work if i have another condition inside that first condition? If it does, how can i write it? Using commas to separe the `if's`, just like the `for's`?

To be more clear, i have this loop in my code i wish to change using the `sum()` syntax:

```julia
hmax = 25;
Nt = 17;
Yh = zeros(Complex128,Nt,Nt,hmax);

for h = 3:2:hmax
  for L = 1:Nt
    for C = 1:Nt
      for i = 1:Nt
        if CONDITION 1
            if CONDITION 2
                 Yh[L,C,h] += first_expression;
            end
            if CONDITION 3
                Yh[L,C,h] += second_expression;
            end
        end
        if CONDITION 4
                 Yh[L,C,h] += third_expression;
                 Yh[C,L,h] = Yh[L,C,h];
        end
      end
    end
  end
end

```

I thought in using 3 `sum()` here:

1 - The first for the conditions 1 and 2;  
2 - The second for the conditions 1 and 3;  
3 - The third for the condition 4.

---

<div class="post-metadata">

**Author:** ![kristoffer.carlsson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/kristoffer.carlsson/32/22_2.png) [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)\
**Post date:** [September 5, 2018, 4:33pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/2 "2018-09-05T16:33:14Z")

</div>

Might want to post this in the optimization category instead ([Optimization (Mathematical) - JuliaLang](https://discourse.julialang.org/c/domain/opt)) since this is not about general Julia usage.

---

<div class="post-metadata">

**Author:** ![mbauman](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbauman/32/31082_2.png) [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Post date:** [September 5, 2018, 4:34pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/3 "2018-09-05T16:34:54Z")

</div>

Moved 🙂

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 5, 2018, 10:03pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/4 "2018-09-05T22:03:34Z")

</div>

The first thing to know is that `sum` (and the generator syntax inside it) is just standard Julia syntax. Since `Yh` contains `Complex128`, this doesn’t actually touch any code in JuMP.

The second thing is, don’t be afraid of loops. They might actually be easier to read than some complicated sequence of `sum`’s. For example:

```julia
for h in 3:2:hmax, L in 1:Nt, C in 1:Nt, i in 1:Nt
    if condition_1 && condition_2
        Yh[L, C, h] += first_expression
    elseif condition_1 && condition_3
        Yh[L, C, h] += second_expression
    elseif condition_4
        Y[L, C, h] += third_expression
        Y[C, L, h] = Y[L, C, h]
    end
end

```

---

<div class="post-metadata">

**Author:** ![Sukera](https://avatars.discourse-cdn.com/v4/letter/s/ce7236/32.png) [@Sukera](https://discourse.julialang.org/u/Sukera)\
**Post date:** [September 6, 2018, 9:39am UTC](https://discourse.julialang.org/t/sum-syntax/14589/5 "2018-09-06T09:39:22Z")

</div>

> [@muriloasouza](#):
>
> sum(expression for i = I1, j = I2 if cond)

I’m not sure where it’s documented (I’m certain it was at some point), but that `if` is a part of ~~comprehension~~ generator syntax, not the `sum` function.

EDIT: Nevermind, I found it - under `Generator Expressions` at the [very bottom of the section](https://docs.julialang.org/en/stable/manual/arrays/#Generator-Expressions-1).

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 6, 2018, 12:01pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/6 "2018-09-06T12:01:45Z")

</div>

I’m sorry, my fault, that was wrong, it’s not a `Complex128` variable anymore. Its just a real matrix.

`Yh = zeros(Nt,Nt,hmax);`

I’m asking about this `sum()` syntax, because i want to use the macros `@constraint` and/or `@NLconstraint` using those first, second and third expressions. I’m a bit confused in how to do this, but in my head it would be something like:

```julia
@constraint(m, Yh[L,C,h] == sum(first_expression for h in 3:2:hmax, L in 1:Nt, C in 1:Nt, i in 1:Nt if condition_1 && condition_2))

@constraint(m, Yh[L,C,h] == sum(second_expression for h in 3:2:hmax, L in 1:Nt, C in 1:Nt, i in 1:Nt if condition_1 && condition_3))

@constraint(m, Yh[L,C,h] == sum(third_expression for h in 3:2:hmax, L in 1:Nt, C in 1:Nt, i in 1:Nt if condition_4))

```

And not yet sure how i would write the `Yh[C,L,h] = Yh[L,C,h]` part.

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 8, 2018, 3:13am UTC](https://discourse.julialang.org/t/sum-syntax/14589/7 "2018-09-08T03:13:46Z")

</div>

You need something like

```julia
for h in 3:2:hmax, L in 1:Nt, C in 1:Nt
    @constraint(m, Yh[L, C, h] == sum(first_expression for i in 1:Nt if condition_1 && condition_2))
    if condition_4
        @constraint(m, Yh[C, L, h] == Yh[L, C, h])
    end
end

```

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 11, 2018, 2:53pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/8 "2018-09-11T14:53:30Z")

</div>

Hi, so i have the following:

```julia
i = 1; # Had to add this, otherwise it produces an error saying i is not defined
for h in 3:2:hmax, L in 1:Nt, C in 1:Nt
    if (condition_1 && condition_2)
       @NLconstraint(m, Yh[L, C, h] == sum(first_expression for i in 1:Nt))
    elseif (condition_1 && condition_3)
       @constraint(m, Yh[L, C, h] == sum(second_expression for i in 1:Nt))
    elseif (condition_4)
       @constraint(m, Yh[L, C, h] == sum(third_expression for i in 1:Nt))
       @constraint(m, Yh[C, L, h] == Yh[L, C, h])
    end
end

```

But when i run my code, i get zeros in all positions, except for:

```julia
julia> getvalue(Yh)
Yh: 3 dimensions:
[1,:,:]
  [1, 1,:]
    [1, 1, 3] = -46.731813188856584
    [1, 1, 5] = -28.391636812292383
    [1, 1, 7] = -20.2401694582778
    [1, 1, 9] = -15.63001153228338
    [1, 1,11] = -12.653536842073537
    [1, 1,13] = -10.562937348884866
    [1, 1,15] = -9.00594278820859
    [1, 1,17] = -7.7950523228143975
    [1, 1,19] = -6.821345536276918
    [1, 1,21] = -6.017242413033545
    [1, 1,23] = -5.338598503936174
    [1, 1,25] = -4.755360420338826

```

Every other single position is zero, like this, for example:

```julia
[8, 6,:]
    [8, 6, 3] = 0.0
    [8, 6, 5] = 0.0
    [8, 6, 7] = 0.0
    [8, 6, 9] = 0.0
    [8, 6,11] = 0.0
    [8, 6,13] = 0.0
    [8, 6,15] = 0.0
    [8, 6,17] = 0.0
    [8, 6,19] = 0.0
    [8, 6,21] = 0.0
    [8, 6,23] = 0.0
    [8, 6,25] = 0.0

```

Any ideas what could be causing this error? I’ve checked all the vectors in those `first, second and third_expressions`, and they all got real values inside.

It is because i took the if conditions out of the `sum()` argument? They really need to be inside it? Or there is something else causing this?

---

<div class="post-metadata">

**Author:** ![coroa](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/coroa/32/5335_2.png) [@coroa](https://discourse.julialang.org/u/coroa)\
**Post date:** [September 12, 2018, 7:27am UTC](https://discourse.julialang.org/t/sum-syntax/14589/9 "2018-09-12T07:27:55Z")

</div>

If your conditions depend on i, they must be inside of the sum expression.

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 12, 2018, 11:57am UTC](https://discourse.julialang.org/t/sum-syntax/14589/10 "2018-09-12T11:57:43Z")

</div>

Yeah, my conditions depends on `i`, `L` and `C`.

So, back with the conditions inside the `sum()`, i got this now:

```julia
i = 1; # Had to add this, otherwise it produces an error saying i is not defined
for h in 3:2:hmax, L in 1:Nt, C in 1:Nt
    @constraint(m, Yh[L, C, h] == sum(first_expression for i in 1:Nt if condition_1 && condition_2))
    @constraint(m, Yh[L, C, h] == sum(second_expression for i in 1:Nt if condition_1 && condition_3))
    @constraint(m, Yh[L, C, h] == sum(third_expression for i in 1:Nt if condition_4))
    if condition_4
    @constraint(m, Yh[C, L, h] == Yh[L, C, h])
    end
end

```

But i’m getting this error:

```julia
ERROR: LoadError: AssertionError: line[1:7] == "Options"
Stacktrace:
 [1] read_sol(::IOStream, ::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:666
 [2] read_results(::IOStream, ::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:575
 [3] open(::AmplNLWriter.##117#118{AmplNLWriter.AmplNLMathProgModel}, ::String, ::String) at .\iostream.jl:152
 [4] read_results(::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:569
 [5] optimize!(::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:419
 [6] optimize!(::CouenneNL.CouenneNLNonlinearModel) at C:\Users\Muril\.julia\v0.6\Lazy\src\macros.jl:268
 [7] #solvenlp#165(::Bool, ::Function, ::JuMP.Model, ::JuMP.ProblemTraits) at C:\Users\Muril\.julia\v0.6\JuMP\src\nlp.jl:1271
 [8] (::JuMP.#kw##solvenlp)(::Array{Any,1}, ::JuMP.#solvenlp, ::JuMP.Model, ::JuMP.ProblemTraits) at .\<missing>:0
 [9] #solve#116(::Bool, ::Bool, ::Bool, ::Array{Any,1}, ::Function, ::JuMP.Model) at C:\Users\Muril\.julia\v0.6\JuMP\src\solvers.jl:172
 [10] solve(::JuMP.Model) at C:\Users\Muril\.julia\v0.6\JuMP\src\solvers.jl:150
 [11] include_string(::String, ::String) at .\loading.jl:522
 [12] include_string(::Module, ::String, ::String) at C:\Users\Muril\.julia\v0.6\Compat\src\Compat.jl:88
 [13] (::Atom.##112#116{String,String})() at C:\Users\Muril\.julia\v0.6\Atom\src\eval.jl:109
 [14] withpath(::Atom.##112#116{String,String}, ::String) at C:\Users\Muril\.julia\v0.6\CodeTools\src\utils.jl:30
 [15] withpath(::Function, ::String) at C:\Users\Muril\.julia\v0.6\Atom\src\eval.jl:38
 [16] hideprompt(::Atom.##111#115{String,String}) at C:\Users\Muril\.julia\v0.6\Atom\src\repl.jl:67
 [17] macro expansion at C:\Users\Muril\.julia\v0.6\Atom\src\eval.jl:106 [inlined]
 [18] (::Atom.##110#114{Dict{String,Any}})() at .\task.jl:80
while loading C:\Users\Muril\Desktop\Murilo\UFPE\Dissertação\Julia\Arquivos Feitos\teste_otimização_formação_Yh.jl, in expression starting on line 198

```

Wich i have no idea what it means. I remember i already got it somewhere else.

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 14, 2018, 2:30pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/11 "2018-09-14T14:30:44Z")

</div>

This is a bug in AmplNLWriter. It will be fixed in an upcoming release. See [Fix bug in sol file parser if the file begins with empty lines. by odow · Pull Request #81 · jump-dev/AmplNLWriter.jl · GitHub](https://github.com/JuliaOpt/AmplNLWriter.jl/pull/81) for details.

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 14, 2018, 3:09pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/12 "2018-09-14T15:09:01Z")

</div>

Oh, thanks for the reply! Well, i’ll have to wait then… hope it get fixed anytime soon!

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 14, 2018, 6:38pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/13 "2018-09-14T18:38:19Z")

</div>

Please follow the instructions in [Couenne options while using AmplNLWriter · Issue #80 · jump-dev/AmplNLWriter.jl · GitHub](https://github.com/JuliaOpt/AmplNLWriter.jl/issues/80#issuecomment-421447842) to see if it fixes your problem.

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 18, 2018, 12:15pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/14 "2018-09-18T12:15:23Z")

</div>

I don’t know if i did correctly, but this is what i got:

```julia
julia> Pkg.checkout("AmplNLWriter")
INFO: Checking out AmplNLWriter master...
INFO: Pulling AmplNLWriter latest master...
INFO: No packages to install, update or remove

```

```julia
julia> Pkg.free("AmplNLWriter")
INFO: Freeing AmplNLWriter
INFO: No packages to install, update or remove

```

And the error persists.

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 18, 2018, 1:53pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/15 "2018-09-18T13:53:02Z")

</div>

Just run `Pkg.checkout("AmplNLWriter")` until [https://github.com/JuliaLang/METADATA.jl/pull/18026](https://github.com/JuliaLang/METADATA.jl/pull/18026) is merged. Then, once it is merged, run `Pkg.free("AmplNLWriter")` and then `Pkg.update()`.

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 18, 2018, 3:02pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/16 "2018-09-18T15:02:31Z")

</div>

I tried again typing those commands in the Julia command prompt, and then the `Pkg.update()` one. It updated a lot of things, but the error still occurs.

After the `Pkg.update()`, i restarted Atom, and when i ran my code, these messages appeared.

```julia
INFO: Recompiling stale cache file C:\Users\Muril\.julia\lib\v0.6\DiffResults.ji for module DiffResults.
INFO: Recompiling stale cache file C:\Users\Muril\.julia\lib\v0.6\JuMP.ji for module JuMP.
INFO: Recompiling stale cache file C:\Users\Muril\.julia\lib\v0.6\CouenneNL.ji for module CouenneNL.

```

That was the only different thing that happened. After that, the error message appears again.

```julia
Couenne 0.5.6 -- an Open-Source solver for Mixed Integer Nonlinear Optimization
Mailing list: couenne@list.coin-or.org
Instructions: http://www.coin-or.org/Couenne
couenne:
ANALYSIS TEST: Reformulating problem: 2.3 seconds
Loaded instance "C:\Users\Muril\.julia\v0.6\AmplNLWriter\.solverdata\jl_94F4.tmp.nl"
Constraints: 21352
Variables: 8160 (51 integer)
Auxiliaries: 1922 (17 integer)

Problem infeasible
Total solve time: 0.001s (0.001s in branch-and-bound)
Lower bound: -inf
Upper bound: inf (gap: --)
Branch-and-bound nodes: 0
ERROR: LoadError: AssertionError: line[1:7] == "Options"
Stacktrace:
 [1] read_sol(::IOStream, ::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:666
 [2] read_results(::IOStream, ::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:575
 [3] open(::AmplNLWriter.##117#118{AmplNLWriter.AmplNLMathProgModel}, ::String, ::String) at .\iostream.jl:152
 [4] read_results(::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:569
 [5] optimize!(::AmplNLWriter.AmplNLMathProgModel) at C:\Users\Muril\.julia\v0.6\AmplNLWriter\src\AmplNLWriter.jl:419
 [6] optimize!(::CouenneNL.CouenneNLNonlinearModel) at C:\Users\Muril\.julia\v0.6\Lazy\src\macros.jl:268
 [7] #solvenlp#165(::Bool, ::Function, ::JuMP.Model, ::JuMP.ProblemTraits) at C:\Users\Muril\.julia\v0.6\JuMP\src\nlp.jl:1271
 [8] (::JuMP.#kw##solvenlp)(::Array{Any,1}, ::JuMP.#solvenlp, ::JuMP.Model, ::JuMP.ProblemTraits) at .\<missing>:0
 [9] #solve#116(::Bool, ::Bool, ::Bool, ::Array{Any,1}, ::Function, ::JuMP.Model) at C:\Users\Muril\.julia\v0.6\JuMP\src\solvers.jl:172
 [10] solve(::JuMP.Model) at C:\Users\Muril\.julia\v0.6\JuMP\src\solvers.jl:150
 [11] include_string(::String, ::String) at .\loading.jl:522
 [12] include_string(::Module, ::String, ::String) at C:\Users\Muril\.julia\v0.6\Compat\src\Compat.jl:88
 [13] (::Atom.##112#116{String,String})() at C:\Users\Muril\.julia\v0.6\Atom\src\eval.jl:109
 [14] withpath(::Atom.##112#116{String,String}, ::String) at C:\Users\Muril\.julia\v0.6\CodeTools\src\utils.jl:30
 [15] withpath(::Function, ::String) at C:\Users\Muril\.julia\v0.6\Atom\src\eval.jl:38
 [16] hideprompt(::Atom.##111#115{String,String}) at C:\Users\Muril\.julia\v0.6\Atom\src\repl.jl:67
 [17] macro expansion at C:\Users\Muril\.julia\v0.6\Atom\src\eval.jl:106 [inlined]
 [18] (::Atom.##110#114{Dict{String,Any}})() at .\task.jl:80
while loading C:\Users\Muril\Desktop\Murilo\UFPE\Dissertação\Julia\Arquivos Feitos\teste_otimização_formação_Yh.jl, in expression starting on line 283

```

Sorry, i don’t understand much of these things… but what do you mean with:

> Just run `Pkg.checkout("AmplNLWriter")` until [Tag AmplNLWriter.jl v0.4.1 by attobot · Pull Request #18026 · JuliaLang/METADATA.jl · GitHub](https://github.com/JuliaLang/METADATA.jl/pull/18026) is merged

I just ran that command, and waited until it was done, so i could ran `Pkg.free("AmplNLWriter")`. Then i waited again, until i could `Pkg.update()`.  
Is this correct? Or i did something wrong?

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 18, 2018, 4:53pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/17 "2018-09-18T16:53:51Z")

</div>

Here is a step-by-step guide:

Step 1. Run `Pkg.checkout("AmplNLWriter")`  
Step 2. Test your code. Hopefully it works. If it doesn’t please follow the instructions in this Github issue: [Couenne options while using AmplNLWriter · Issue #80 · jump-dev/AmplNLWriter.jl · GitHub](https://github.com/JuliaOpt/AmplNLWriter.jl/issues/80#issuecomment-421127894)  
Step 3. Wait a few days. You can keep working on your (hopefully working) code in the meantime.  
Step 4. Check [https://github.com/JuliaLang/METADATA.jl/pull/18026](https://github.com/JuliaLang/METADATA.jl/pull/18026) to see if the green “Open” symbol has turned to a purple “Merged” symbol. If it hasn’t, go back to working on your code and wait a few more days. If it has, go to step 5.  
Step 5. Run `Pkg.free("AmplNLWriter")`  
Step 6. Run `Pkg.update()`  
Step 7. Test your code again. Everything should be fixed.

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 18, 2018, 5:23pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/18 "2018-09-18T17:23:43Z")

</div>

Just tried again, and i got this:

```julia
julia> Pkg.checkout("AmplNLWriter")
INFO: Checking out AmplNLWriter master...
INFO: Pulling AmplNLWriter latest master...
WARNING: julia is fixed at 0.6.3 conflicting with requirement for Makie: [0.7.0,∞)
WARNING: julia is fixed at 0.6.3 conflicting with requirement for AbstractPlotting: [0.7.0,∞)
ERROR: fixed packages introduce conflicting requirements for GLFW:
         Makie requires versions [2.2.0,∞) [none of the available versions can satisfy this requirement]
       available versions are 0.0.0, 0.0.1, 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-alpha.2, 1.0.0-alpha.3, 1.0.0-alpha.4, 1.0.0-alpha.5, 1.0.0-alpha.6, 1.0.0-alpha.7, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.2.0, 1.2.1, 1.2.2, 1.3.0, 1.4.0, 1.4.1, 1.5.0, 2.0.0-alpha and 2.0.1

```

And the code is not working yet. Guess i’ll wait a few days then.

Thanks again for your assistance!

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [September 19, 2018, 1:43pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/19 "2018-09-19T13:43:05Z")

</div>

Do you need Makie? Does it even work? If not, run `Pkg.rm("Makie")`. This error isn’t related to AmplNLWriter.

---

<div class="post-metadata">

**Author:** ![muriloasouza](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/muriloasouza/32/4650_2.png) [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Post date:** [September 20, 2018, 12:10pm UTC](https://discourse.julialang.org/t/sum-syntax/14589/20 "2018-09-20T12:10:38Z")

</div>

Actually i don’t. It used to work, but i’m not going to use it anymore.

I still see the green “Open” symbol there, so i’ll wait a few more days.