# Indices in a SentinelArray

**URL:** <https://discourse.julialang.org/t/indices-in-a-sentinelarray/73894>\
**Category:** New to Julia\
**Tags:** question\
**Created:** [January 1, 2022, 2:18pm UTC](https://discourse.julialang.org/t/indices-in-a-sentinelarray/73894 "2022-01-01T14:18:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![trilobit](https://avatars.discourse-cdn.com/v4/letter/t/a8b319/32.png) [@trilobit](https://discourse.julialang.org/u/trilobit)\
**Post date:** [January 1, 2022, 2:18pm UTC](https://discourse.julialang.org/t/indices-in-a-sentinelarray/73894/1 "2022-01-01T14:18:29Z")

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In a SentinelArray I want zu observe more than one cell  
i.e

 ![img2](https://global.discourse-cdn.com/julialang/original/3X/3/6/36b2d61711f56bedc4960f543f42fffbe3b5658a.webp)

but I’m clueless, how I can detect the indices of all selected cells.