# Problem with adding a column

**URL:** <https://discourse.julialang.org/t/problem-with-adding-a-column/4243>\
**Category:** Optimization (Mathematical)\
**Created:** [June 13, 2017, 12:55pm UTC](https://discourse.julialang.org/t/problem-with-adding-a-column/4243 "2017-06-13T12:55:32Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mposs](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mposs/32/21087_2.png) [@mposs](https://discourse.julialang.org/u/mposs)\
**Post date:** [June 13, 2017, 12:55pm UTC](https://discourse.julialang.org/t/problem-with-adding-a-column/4243/1 "2017-06-13T12:55:32Z")

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I’m trying to add an anonymous variable to two constraints but I get an error.

```julia
using JuMP
m = Model()
@constraint(m, con1, 0 <= 1)
@constraint(m, con2, 0 <= 1)
constrrefs = Vector{ConstraintRef}(0)
push!(constrrefs,con1)
push!(constrrefs,con2)
values = [1; 1]
@variable(m, lowerbound = 0.0, upperbound = 1.0, objective = 10.0, inconstraints = constrrefs, coefficients = values)

ERROR: MethodError: no method matching constructvariable!(::JuMP.Model, ::JuMP.#_error#101{Tuple{Symbol,Expr,Expr,Expr,Expr,Expr}}, ::Float64, ::Float64, ::Symbol, ::Float64, ::Array{JuMP.ConstraintRef,1}, ::Array{Int64,1}, ::String, ::Float64)
Closest candidates are:
  constructvariable!(::JuMP.Model, ::Function, ::Number, ::Number, ::Symbol, ::Number, ::Array{T,1}, ::Array{Float64,1}, ::AbstractString, ::Number; extra_kwargs...) at /home/possm/.julia/v0.5/JuMP/src/macros.jl:821
  constructvariable!(::JuMP.Model, ::Function, ::Number, ::Number, ::Symbol, ::AbstractString, ::Number; extra_kwargs...) at /home/possm/.julia/v0.5/JuMP/src/macros.jl:828

```

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<div class="post-metadata">

**Author:** ![Dan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dan/32/42581_2.png) [@Dan](https://discourse.julialang.org/u/Dan)\
**Post date:** [June 13, 2017, 1:14pm UTC](https://discourse.julialang.org/t/problem-with-adding-a-column/4243/2 "2017-06-13T13:14:08Z")

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`values` is an Int array. Try:

```julia
values = [1.0 , 1.0]

```

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<div class="post-metadata">

**Author:** ![mposs](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mposs/32/21087_2.png) [@mposs](https://discourse.julialang.org/u/mposs)\
**Post date:** [June 13, 2017, 1:32pm UTC](https://discourse.julialang.org/t/problem-with-adding-a-column/4243/3 "2017-06-13T13:32:15Z")

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Thank’s!

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**Author:** ![fancagi](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/fancagi/32/28898_2.png) [@fancagi](https://discourse.julialang.org/u/fancagi)\
**Post date:** [October 12, 2017, 6:58pm UTC](https://discourse.julialang.org/t/problem-with-adding-a-column/4243/4 "2017-10-12T18:58:11Z")

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Hi!

did this solution worked for you? I’m having the same problem and no idea how to solve it.

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<div class="post-metadata">

**Author:** ![mposs](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mposs/32/21087_2.png) [@mposs](https://discourse.julialang.org/u/mposs)\
**Post date:** [October 12, 2017, 7:08pm UTC](https://discourse.julialang.org/t/problem-with-adding-a-column/4243/5 "2017-10-12T19:08:14Z")

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Yes it did.