# ANN: QNaNs.jl (easier quiet NaNs)

**URL:** <https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387>\
**Category:** Numerics\
**Tags:** numbers\
**Created:** [January 10, 2017, 12:40pm UTC](https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387 "2017-01-10T12:40:00Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![JeffreySarnoff](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jeffreysarnoff/32/1980_2.png) [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Post date:** [January 10, 2017, 12:40pm UTC](https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387/1 "2017-01-10T12:40:00Z")

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# QNaNs.jl

Simplifies the use of quiet NaNs to propagate information from within numerical computations.

####Quick Look

```
> Pkg.add("QNaNs")
> using QNaNs

> a_qnan = qnan(36)
NaN
> payload = qnan( a_qnan )
36

> typeof(a_qnan)
Float64
> isnan(a_qnan), isnan(NaN) # quiet NaNs areNaNs
true, true

# works with Float64, Float32 and Float16    
> a_qnan32 = qnan(Int32(-77))
NaN32
> payload = qnan( a_qnan32 );
> payload, typeof(payload)
-77, Int32

```

[the repository has a little more information](https://github.com/JeffreySarnoff/QNaNs.jl)

---

<div class="post-metadata">

**Author:** ![tshort](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tshort/32/43_2.png) [@tshort](https://discourse.julialang.org/u/tshort)\
**Post date:** [January 10, 2017, 12:45pm UTC](https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387/2 "2017-01-10T12:45:10Z")

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That link didn’t work for me. This worked:

> **[GitHub - JeffreySarnoff/QNaNs.jl: Use of quiet NaNs carrying different payloads.](https://github.com/JeffreySarnoff/QNaNs.jl)**
>
> Use of quiet NaNs carrying different payloads. Contribute to JeffreySarnoff/QNaNs.jl development by creating an account on GitHub.

---

<div class="post-metadata">

**Author:** ![JeffreySarnoff](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jeffreysarnoff/32/1980_2.png) [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Post date:** [January 10, 2017, 12:50pm UTC](https://discourse.julialang.org/t/ann-qnans-jl-easier-quiet-nans/1387/3 "2017-01-10T12:50:37Z")

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thank you – link is updated