# Unique() to a certain tolerance?

**URL:** <https://discourse.julialang.org/t/unique-to-a-certain-tolerance/23007>\
**Category:** General Usage\
**Tags:** faq\
**Created:** [April 10, 2019, 4:34pm UTC](https://discourse.julialang.org/t/unique-to-a-certain-tolerance/23007 "2019-04-10T16:34:16Z")\
**Posts on this page:** 1\
**Showing post:** 5

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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:** [April 10, 2019, 5:14pm UTC](https://discourse.julialang.org/t/unique-to-a-certain-tolerance/23007/5 "2019-04-10T17:14:31Z")

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Someone periodically asks this, but note that:

> [@Is it safe to compare rounded float values for equality?](https://discourse.julialang.org/t/is-it-safe-to-compare-rounded-float-values-for-equality/21278/10):
>
> Any bucketing of floating-point numbers into more than one bucket will have the property that there are values which only differ in the last bit yet are in different buckets.

So no matter what you do, you’ll be potentially putting values that differ by one unit in the last place into different buckets.

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_[View the full topic](https://discourse.julialang.org/t/unique-to-a-certain-tolerance/23007)._