# Question about arrays

**URL:** <https://discourse.julialang.org/t/question-about-arrays/25405>\
**Category:** New to Julia\
**Tags:** jump\
**Created:** [June 18, 2019, 12:27pm UTC](https://discourse.julialang.org/t/question-about-arrays/25405 "2019-06-18T12:27:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![RaquelSantos](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/raquelsantos/32/3668_2.png) [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Post date:** [June 18, 2019, 12:27pm UTC](https://discourse.julialang.org/t/question-about-arrays/25405/1 "2019-06-18T12:27:28Z")

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@variable(model,Y[1:n], lower\_bound=0)  
T = Float64.(model.TP)

a = Int64  
b = Int64  
a = 1  
b = n

Y[1:n]\*T[a:b] - MethodError: no method matching \*(::Array{VariableRef,1}, ::Array{Float64,1})

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<div class="post-metadata">

**Author:** ![foobar\_lv2](https://avatars.discourse-cdn.com/v4/letter/f/ee59a6/32.png) [@foobar\_lv2](https://discourse.julialang.org/u/foobar_lv2)\
**Post date:** [June 18, 2019, 1:12pm UTC](https://discourse.julialang.org/t/question-about-arrays/25405/2 "2019-06-18T13:12:30Z")

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Have you tried `.*`?

In julia, element-wise ops are mostly done via broadcast / dot-syntax.