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linspace: try to "lift" linspace the float ranges are [close #9637] #9666

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merged 13 commits into from
Apr 13, 2015
Merged

linspace: try to "lift" linspace the float ranges are [close #9637] #9666

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d6866be
linspace: "lift" linspace the way float ranges are [close #9637]
StefanKarpinski Jan 7, 2015
b7df3ad
linspace: add "handcrafted" linspace test cases.
StefanKarpinski Jan 7, 2015
42db285
LinSpace: make linspace return a range-like type.
StefanKarpinski Mar 10, 2015
83f862a
LinSpace: improve length 0 and 1 corner cases.
StefanKarpinski Mar 25, 2015
ccc6798
linspace: oops, forgot the ridiculous, arbitrary default of 50.
StefanKarpinski Mar 25, 2015
4fa535c
linspace: "center" computations to handle extreme ranges correctly.
StefanKarpinski Mar 26, 2015
a823c91
linspace: handle very large *and* very small endpoints correctly.
StefanKarpinski Mar 30, 2015
ae1706b
LinSpace: represent length using floating-point value too.
StefanKarpinski Apr 3, 2015
62b4aaa
linspace: more extensive testing of extreme linspace cases.
StefanKarpinski Apr 3, 2015
f7bff89
exports: remove deprecated `linrange` from exports.
StefanKarpinski Apr 3, 2015
7ce35bf
linspace: raise errors for cases that cannot be constructed.
StefanKarpinski Apr 6, 2015
2a130b7
linspace: update documentation, add NEWS entry.
StefanKarpinski Apr 6, 2015
aa78037
linspace: fix 32-bit failures
StefanKarpinski Apr 13, 2015
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linspace: raise errors for cases that cannot be constructed. 
E.g. linspace(realmin(), realmax(), maxintfloat())
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@StefanKarpinski
StefanKarpinski committed Apr 13, 2015
commit 7ce35bf029be022467352175839c597fc8b8c526
12 changes: 8 additions & 4 deletions base/range.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -208,12 +208,16 @@ function linspace{T<:FloatingPoint}(start::T, stop::T, len::T)
end
end
end
if isinf(n*start) || isinf(n*stop)
n, p = frexp(n)
a, c, s = start, stop, n
if isinf(a*n) || isinf(c*n)
s, p = frexp(s)
p = one(p) << p
start /= p; stop /= p
a /= p; c /= p
end
return LinSpace(start, stop, len, n)
if a*n/s == start && c*n/s == stop
return LinSpace(a, c, len, s)
end
error("linspace($start, $stop, $len): cannot be constructed")
end
function linspace{T<:FloatingPoint}(start::T, stop::T, len::Real)
T_len = convert(T, len)
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