Merge pull request #87 from JuliaMath/teh/realmin

realmin should be equal to eps for FixedPoint. Fixes #79.

Author: timholy

src/FixedPointNumbers.jl

@@ -68,7 +68,7 @@ isinteger{T,f}(x::FixedPoint{T,f}) = (x.i&(1<<f-1)) == 0
 # traits
 typemax{T<: FixedPoint}(::Type{T}) = T(typemax(rawtype(T)), 0)
 typemin{T<: FixedPoint}(::Type{T}) = T(typemin(rawtype(T)), 0)
-realmin{T<: FixedPoint}(::Type{T}) = typemin(T)
+realmin{T<: FixedPoint}(::Type{T}) = eps(T)
 realmax{T<: FixedPoint}(::Type{T}) = typemax(T)
 
 widen1(::Type{Int8})   = Int16

test/fixed.jl

@@ -126,3 +126,6 @@ for T in (Fixed{Int8,8}, Fixed{Int16,8}, Fixed{Int16,10}, Fixed{Int32,16})
     @test isa(a, Array{T,2})
     @test size(a) == (3,5)
 end
+
+# issue #79
+@test realmin(Q11f4) == Q11f4(0.06)

test/normed.jl

@@ -35,7 +35,7 @@ for T in (FixedPointNumbers.UF..., UF2...)
     @test one(T) == 1
     @test one(T) * one(T) == one(T)
     @test typemin(T) == 0
-    @test realmin(T) == 0
+    @test realmin(T) == eps(T)
     @test eps(zero(T)) == eps(typemax(T))
     @test sizeof(T) == sizeof(FixedPointNumbers.rawtype(T))
 end