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Failure of constructing linspace #10873

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lindahua opened this issue Apr 18, 2015 · 6 comments
Closed

Failure of constructing linspace #10873

lindahua opened this issue Apr 18, 2015 · 6 comments

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@lindahua
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I encountered this while fixing issues in Distributions.jl:

dhlin:~/.julia/v0.4/Distributions$ julia
               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "help()" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.4.0-dev+4319 (2015-04-17 03:26 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit ef06211 (0 days old master)
|__/                   |  x86_64-apple-darwin14.3.0

julia> linspace(0.030151007560504324, 13.81551055796427, 50)
linspace(0.030151007560504324,13.81551055796427,50)

julia> linspace(0.030151007560504324, 13.81551055796427, 51)
ERROR: linspace(0.030151007560504324, 13.81551055796427, 51.0): cannot be constructed
 in error at error.jl:19
 in linspace at range.jl:220
 in linspace at range.jl:225

Why 50 works but not 51?

The version is pretty recent: Version 0.4.0-dev+4319 (2015-04-17 03:26 UTC).
@pao
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pao commented Apr 18, 2015

#9666?

@lindahua
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I see. Closing this then.

@pao
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pao commented Apr 18, 2015

Well, I'm glad you made sense of it. I'm still lost (and am pretty sure linspace is no longer usable if it's going to be this picky.)

@mbauman
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mbauman commented Apr 18, 2015

I'm afraid that this should be reopened. I don't think it's okay for linspace to be erroring so often. It fails about 20% of the time with the rather simple linspace(rand(), 2, 8).

@mbauman mbauman reopened this Apr 18, 2015
@pao
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pao commented Apr 18, 2015

cc @StefanKarpinski

@StefanKarpinski
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This is my doing. Will fix shortly.

StefanKarpinski added a commit that referenced this issue Apr 18, 2015
@StefanKarpinski
linspace: temporary fix for LinSpaces with problematic endpoints.
6a9d46f 
This allows construction of linear ranges such as

	julia> linspace(0.030151007560504324, 13.81551055796427, 51)
	linspace(0.030151007560504324,13.815510557964268,51)

Note, however, that one of the endpoints is not exactly what was
requested. It's unclear how to best resolve this issue. #10873
mbauman pushed a commit to mbauman/julia that referenced this issue Jun 6, 2015
@StefanKarpinski @mbauman
linspace: temporary fix for LinSpaces with problematic endpoints.
5cb0fa3 
This allows construction of linear ranges such as

	julia> linspace(0.030151007560504324, 13.81551055796427, 51)
	linspace(0.030151007560504324,13.815510557964268,51)

Note, however, that one of the endpoints is not exactly what was
requested. It's unclear how to best resolve this issue. JuliaLang#10873
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4 participants
@pao @StefanKarpinski @mbauman @lindahua