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prevfloat/nextfloat for args <= 0 #5025

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nolta opened this issue Dec 3, 2013 · 1 comment
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prevfloat/nextfloat for args <= 0 #5025

nolta opened this issue Dec 3, 2013 · 1 comment

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@nolta
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nolta commented Dec 3, 2013 

julia> nextfloat(0.)
5.0e-324

julia> prevfloat(0.)
NaN

julia> z = BigFloat(0.)
0e+00 with 256 bits of precision

julia> nextfloat(z)
2.382564904887951073216169781732674520415196125559239787955023752600945386104324e-323228497 with 256 bits of precision

julia> prevfloat(z)
-2.382564904887951073216169781732674520415196125559239787955023752600945386104324e-323228497 with 256 bits of precision

julia> nextfloat(-1.)
-1.0000000000000002

julia> prevfloat(-1.)
-0.9999999999999999

julia> z = BigFloat(-1.)
-1e+00 with 256 bits of precision

julia> nextfloat(z)
-9.999999999999999999999999999999999999999999999999999999999999999999999999999914e-01 with 256 bits of precision

julia> prevfloat(z)
-1.000000000000000000000000000000000000000000000000000000000000000000000000000017e+00 with 256 bits of precision
gitfoxi pushed a commit to gitfoxi/julia that referenced this issue Dec 13, 2013
Merge remote-tracking branch 'upstream/master'
4e8db17 
* upstream/master: (53 commits)
  edit embedding chapter
  formatting fixes
  Fix JuliaLang#5056
  more consitent/useful description of predicate in ie all()
  NEWS for JuliaLang#4042
  Add sparse matvec to perf benchmark (#4707)
  Use warn_once instead of warn (JuliaLang#5038)
  Use warn() instead of println in base/sprase/sparsematrix.jl
  allow scale(b,A) or scale(A,b) when b is a scalar as well as a vector, don't restrict scale unnecessarily to arrays of numbers (e.g. scaling arrays of arrays should work), and improve documentation for scale\!
  Added section about memory management
  added negative bitarray rolling
  More accurate linspace for types with greater precision than Float64
  add realmin realmax for BigFloat
  fix eps(realmax), add typemin and typemax for BigFloat
  fix JuliaLang#5025, ordering used by nextfloat/prevfloat
  roll back on errors during type definitions. fixes JuliaLang#5009
  improve method signature errors. fixes JuliaLang#5018
  update juliadoc
  add more asserts for casts
  Fix segfaulting on strstr() failure
  ...
@StefanKarpinski
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Technically, this was a breaking change. It would at least be listed in NEWS.

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@StefanKarpinski @nolta