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rand(::BigFloat) #13948

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mschauer opened this issue Nov 11, 2015 · 5 comments
Closed

rand(::BigFloat) #13948

mschauer opened this issue Nov 11, 2015 · 5 comments
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domain:bignums BigInt and BigFloat domain:randomness Random number generation and the Random stdlib

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@mschauer
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We once had a rand! for BigFloats using mpfr_urandom, see #4845.
Apparently this got removed/got lost. As said in #9836 "probably not high priority other than for completeness". I ran into this when calling iterative algorithms parametrized by element-type T which starting from a random vector rand(T,n).
@stevengj
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Apparently it got reverted by @ViralBShah because it broke the build: 1a8885b

@mschauer
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I looked at it - oh man - that is bit tricky: mpfr really wants to use the gmp random number generator and does not allow to provide entropy directly.

@StefanKarpinski
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We may have to fork it – it wouldn't be the first time :-. Longer term the MPFR project may be receptive to upstreaming changes that allow using other sources of entropy.

@mschauer mschauer mentioned this issue Nov 11, 2015
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@mschauer
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I made a PR with a let's call it economic approach without attempting to circumvent GPM.

@mschauer
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cc @andrioni

@rfourquet rfourquet added domain:bignums BigInt and BigFloat domain:randomness Random number generation and the Random stdlib labels Jul 9, 2017
rfourquet added a commit that referenced this issue Jul 9, 2017
@rfourquet
implement rand(::BigFloat) (close #13948)
629b9ac
rfourquet added a commit that referenced this issue Aug 18, 2017
@rfourquet
implement rand(::BigFloat) (close #13948)
261f323
rfourquet added a commit that referenced this issue Aug 21, 2017
@rfourquet
implement rand(::BigFloat) (close #13948)
844277a
rfourquet added a commit that referenced this issue Aug 23, 2017
@rfourquet
Merge pull request #22720 from JuliaLang/rf/rand-BigFloat
ebc4ade 
implement rand(::BigFloat) (close #13948)
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domain:bignums BigInt and BigFloat domain:randomness Random number generation and the Random stdlib
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@StefanKarpinski @mschauer @stevengj @rfourquet