# \#zero

**URL:** https://discourse.julialang.org/tag/zero/1804.md

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## [JuMP and SparseArrays](https://discourse.julialang.org/t/jump-and-sparsearrays/129264)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 5\
**Last updated:** [May 23, 2025, 8:32am UTC](https://discourse.julialang.org/t/jump-and-sparsearrays/129264 "2025-05-23T08:32:57Z")

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The background is using SparseArrays, JuMP m = Model(); @variable(m, x\[1:2\]); My question is, can I create a sparse 2-by-2 object (whatever it is) denoted A, such that A\[1, 1\] returns me x\[1\], A\[2, 1\] returns me x\[2\].…