# How to convert fmpq to Int

**URL:** <https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634>\
**Category:** General Usage\
**Tags:** question, nemo, fmpq\
**Created:** [June 12, 2022, 12:41pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634 "2022-06-12T12:41:17Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![XLVII](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xlvii/32/37099_2.png) [@XLVII](https://discourse.julialang.org/u/XLVII)\
**Post date:** [June 12, 2022, 12:41pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634/1 "2022-06-12T12:41:17Z")

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v = fmpq[1,0,0] vector,

how to convert this to just [1,0,0]

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**Author:** ![nilshg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nilshg/32/2283_2.png) [@nilshg](https://discourse.julialang.org/u/nilshg)\
**Post date:** [June 12, 2022, 2:09pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634/2 "2022-06-12T14:09:07Z")

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What is `fmpq`? Please read:

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/please-read-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …

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**Author:** ![rafael.guerra](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rafael.guerra/32/216610_2.png) [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)\
**Post date:** [June 12, 2022, 6:54pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634/3 "2022-06-12T18:54:43Z")

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> [@nilshg](#):
>
> What is `fmpq`?

fmpq = frequently making puzzling questions

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<div class="post-metadata">

**Author:** ![ImreSamu](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/imresamu/32/20677_2.png) [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)\
**Post date:** [June 12, 2022, 7:55pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634/4 "2022-06-12T19:55:36Z")

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> [@XLVII](#):
>
> v = fmpq[1,0,0] vector,
> 
> how to convert this to just [1,0,0]

if the `denominator()` = 1

- Then use the `numerator()`
- Else Ouch …

```julia
julia> using Nemo
julia> v = fmpq[1,0,0]
3-element Vector{fmpq}:
 1
 0
 0
julia> biv =BigInt[]
BigInt[]
julia> for a in v
           n = numerator(a)
           d = denominator(a)  
           if isone(d)
             push!(biv, BigInt(n) )  
           else
             println("ouch ..")
           end
       end
julia> println(biv)
BigInt[1, 0, 0]

```

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<div class="post-metadata">

**Author:** ![ImreSamu](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/imresamu/32/20677_2.png) [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)\
**Post date:** [June 12, 2022, 8:18pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634/5 "2022-06-12T20:18:28Z")

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> [@XLVII](#):
>
> v = fmpq[1,0,0] vector,

hint: if your question is a `nemo` related

- Then you can add a `nemo` tag for your question.

See other `nemo` related questions:

- [Topics tagged nemo](https://discourse.julialang.org/tag/nemo)

Nemo types

- [Types in Nemo · Nemo.jl](https://nemocas.github.io/Nemo.jl/latest/types/)
  - `fmpq` (`FlintRationalField`)

And you can check the source code

- [https://github.com/Nemocas/Nemo.jl/search?q=fmpq+numerator+denominator](https://github.com/Nemocas/Nemo.jl/search?q=fmpq+numerator+denominator)

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<div class="post-metadata">

**Author:** ![ImreSamu](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/imresamu/32/20677_2.png) [@ImreSamu](https://discourse.julialang.org/u/ImreSamu)\
**Post date:** [June 12, 2022, 9:01pm UTC](https://discourse.julialang.org/t/how-to-convert-fmpq-to-int/82634/6 "2022-06-12T21:01:54Z")

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better version

```julia
using Nemo
int_numerator_fmpq(v) = ifelse( unique!(denominator.(v)) == [fmpz(1)], Int.(numerator.(v)), missing ); 

int_numerator_fmpq( fmpq[1,0,0] )
int_numerator_fmpq( fmpq[1//3, 9//2 , 1//1] )
int_numerator_fmpq( fmpq[3//3, 999//999, 0//2] )

```

log:

```julia
julia> int_numerator_fmpq(v) = ifelse( unique!(denominator.(v)) == [fmpz(1)], Int.(numerator.(v)), missing );

julia> int_numerator_fmpq( fmpq[1,0,0] )
3-element Vector{Int64}:
 1
 0
 0

julia> int_numerator_fmpq( fmpq[1//3, 9//2 , 1//1] )
missing

julia> int_numerator_fmpq( fmpq[3//3, 999//999, 0//2] )
3-element Vector{Int64}:
 1
 1
 0

```