# Most efficient way to stack vectors on the fourth dimension

**URL:** <https://discourse.julialang.org/t/most-efficient-way-to-stack-vectors-on-the-fourth-dimension/19867>\
**Category:** New to Julia\
**Created:** [January 21, 2019, 11:35am UTC](https://discourse.julialang.org/t/most-efficient-way-to-stack-vectors-on-the-fourth-dimension/19867 "2019-01-21T11:35:55Z")\
**Posts on this page:** 1\
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**Author:** ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Post date:** [January 21, 2019, 12:06pm UTC](https://discourse.julialang.org/t/most-efficient-way-to-stack-vectors-on-the-fourth-dimension/19867/4 "2019-01-21T12:06:49Z")

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> [@Tamas\_Papp](#):
>
> _3-dimensional_ arrays

Correct. Because it’s image data with height width and colour channels; that makes 3 dims. But the data is just grey images so the colourchannel dim disappears

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