# Changing the the bounds for base.rand Float outputs
**URL:** https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186
**Category:** New to Julia
**Tags:** question
**Created:** [June 4, 2024, 4:42pm UTC](https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186 "2024-06-04T16:42:31Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@ApproximateTruth](https://discourse.julialang.org/u/ApproximateTruth)
#### Post date: [June 4, 2024, 4:42pm UTC](https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186/1 "2024-06-04T16:42:31Z")
Hey new to julia and wondering how to augment the bounds of the base.rand() function for Float64 numbers, I’m trying to get (-1,1) as the new min and max.
I checked the documentation on this [page](https://docs.julialang.org/en/v1/stdlib/Random/#Base.rand) and it isn’t clear to me how to change typemin(S):typemax(S) for an individual usage of the function.
Thank you so much for any assistance and apologies if this is already a commonly asked question, I couldn’t find anyone who asked something similar.
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### Author:  [@joshsanz](https://discourse.julialang.org/u/joshsanz)
#### Post date: [June 4, 2024, 4:46pm UTC](https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186/2 "2024-06-04T16:46:54Z")
Rather than changing `typemin` / `typemax` which affect more than `rand()`, it’s much safer to define a `myrand() = rand() * 2 - 1` function which gives you the range you want without further effects.
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### Author:  [@Alexander\_Knudson](https://discourse.julialang.org/u/Alexander_Knudson)
#### Post date: [June 4, 2024, 5:32pm UTC](https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186/3 "2024-06-04T17:32:38Z")
Do note that this produces values in `[-1, 1)`. So if @ApproximateTruth wants exclusive bounds `(-1, 1)`, then they can do `rand() * 2 - prevfloat(1.0)`. Though practically this makes no difference since the chance of randomly getting exactly `-1` is so small 😋
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### Author:  [@ApproximateTruth](https://discourse.julialang.org/u/ApproximateTruth)
#### Post date: [June 4, 2024, 7:29pm UTC](https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186/4 "2024-06-04T19:29:09Z")
Thank you for your reply, I was thinking of just scaling it but was wondering it there was a pre-existing way of augmenting the bounds that I was just missing.
Much appreciated
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### Author:  [@stevengj](https://discourse.julialang.org/u/stevengj)
#### Post date: [June 4, 2024, 7:30pm UTC](https://discourse.julialang.org/t/changing-the-the-bounds-for-base-rand-float-outputs/115186/5 "2024-06-04T19:30:39Z")
> [@ApproximateTruth](#):
>
> Thank you for your reply, I was thinking of just scaling it but was wondering it there was a pre-existing way of augmenting the bounds that I was just missing.
You could use [`rand(Uniform(-1,1))` via Distributions.jl](https://juliastats.org/Distributions.jl/latest/univariate/#Distributions.Uniform).