From 1963fe208e1aa1cba6ddb961cf1dc86e6103c43f Mon Sep 17 00:00:00 2001
From: Patrick Kofod Mogensen <patrick.mogensen@gmail.com>
Date: Wed, 3 Feb 2016 10:35:36 +0100
Subject: [PATCH] Added an extrema(plt) which return the tuple (xmin, xmax),
 and changed abline! to use extrema.

---
 src/recipes.jl | 4 ++--
 src/utils.jl   | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/recipes.jl b/src/recipes.jl
index 45309c12..adf59872 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -132,7 +132,7 @@ end
 
 "Adds a+bx... straight line over the current plot"
 function abline!(plt::Plot, a, b; kw...)
-    plot!(plt, [xmin(plt), xmax(plt)], x -> b + a*x; kw...)
+    plot!(plt, [extrema(plt)...], x -> b + a*x; kw...)
 end
 
-abline!(args...; kw...) = abline!(current(), args...; kw...)
+abline!(args...; kw...) = abline!(current(), args...; kw...)
\ No newline at end of file
diff --git a/src/utils.jl b/src/utils.jl
index 576f4970..90431042 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -471,3 +471,5 @@ xmin(plt::Plot) = minimum([minimum(d[:x]) for d in plt.seriesargs])
 "Largest x in plot"
 xmax(plt::Plot) = maximum([maximum(d[:x]) for d in plt.seriesargs])
 
+"Extrema of x-values in plot"
+Base.extrema(plt::Plot) = (xmin(plt), xmax(plt))
\ No newline at end of file