From 53964770827704b52dcce9b2bf395905ba780d9e Mon Sep 17 00:00:00 2001
From: Daniel Schwabeneder <daschw@disroot.org>
Date: Tue, 30 Oct 2018 09:02:58 +0100
Subject: [PATCH] alow heatmap of nx1 or 1xn matrices

---
 src/backends/gr.jl | 4 ++--
 src/utils.jl       | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/backends/gr.jl b/src/backends/gr.jl
index 836276fd..78d6bc7b 100644
--- a/src/backends/gr.jl
+++ b/src/backends/gr.jl
@@ -614,7 +614,7 @@ function _update_min_padding!(sp::Subplot{GRBackend})
             rightpad += 4mm
         else
             leftpad += 4mm
-        end 
+        end
     end
     if sp[:colorbar_title] != ""
         rightpad += 4mm
@@ -671,7 +671,7 @@ function gr_display(sp::Subplot{GRBackend}, w, h, viewport_canvas)
             outside_ticks = true
             for ax in (sp[:xaxis], sp[:yaxis])
                 v = series[ax[:letter]]
-                if diff(collect(extrema(diff(v))))[1] > 1e-6*std(v)
+                if length(v) > 1 && diff(collect(extrema(diff(v))))[1] > 1e-6*std(v)
                     @warn("GR: heatmap only supported with equally spaced data.")
                 end
             end
diff --git a/src/utils.jl b/src/utils.jl
index c52ba186..2b4c5ea7 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -357,6 +357,7 @@ const _scale_base = Dict{Symbol, Real}(
 )
 
 function _heatmap_edges(v::AVec)
+  length(v) == 1 && return v[1] .+ [-0.5, 0.5]
   vmin, vmax = ignorenan_extrema(v)
   extra_min = (v[2] - v[1]) / 2
   extra_max = (v[end] - v[end - 1]) / 2