# Sparse with default value "Inf"

**URL:** https://discourse.julialang.org/t/sparse-with-default-value-inf/35110
**Category:** General Usage
**Tags:** question, sparse
**Created:** [February 25, 2020, 12:04pm UTC](https://discourse.julialang.org/t/sparse-with-default-value-inf/35110 "2020-02-25T12:04:36Z")
**Posts on this page:** 1
**Showing post:** 27

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### Author: ![StefanKarpinski](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stefankarpinski/32/24_2.png) [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)
#### Post date: [February 29, 2020, 12:10am UTC](https://discourse.julialang.org/t/sparse-with-default-value-inf/35110/27 "2020-02-29T00:10:43Z")

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It doesn’t surprise me that Mathematica allows this, but I’m not aware of any numerical sparse matrix libraries (UMFPACK, SuiteSparse, ARPACK, etc.) that support it. It would be a large amount of work to support the full range of efficient operations on a sparse matrix type that deviates from the standard CSC representation. Work that Mathematica has done, or course, but it’s not like we can use that.

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