# CuArray find first negative value along columns

**URL:** <https://discourse.julialang.org/t/cuarray-find-first-negative-value-along-columns/45012>\
**Category:** New to Julia\
**Tags:** question\
**Created:** [August 15, 2020, 9:21pm UTC](https://discourse.julialang.org/t/cuarray-find-first-negative-value-along-columns/45012 "2020-08-15T21:21:58Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![mkarikom](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkarikom/32/7096_2.png) [@mkarikom](https://discourse.julialang.org/u/mkarikom)\
**Post date:** [August 16, 2020, 10:38pm UTC](https://discourse.julialang.org/t/cuarray-find-first-negative-value-along-columns/45012/5 "2020-08-16T22:38:03Z")

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Yeah that seems reasonable. I’ve [created another post](https://discourse.julialang.org/t/findfirst-on-2d-cuarray/45069) which addresses the first part of this problem: how to call kernels vector-wise on a device matrix that update elements of a column vector. Once that is done I will update this thread.

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