matplotlib · Raab70 · Dec 27, 2017 · Dec 27, 2017 · Dec 27, 2017 · Dec 27, 2017
diff --git a/doc/users/next_whats_new/2017-12-27_legend_title_size_rc.rst b/doc/users/next_whats_new/2017-12-27_legend_title_size_rc.rst
@@ -0,0 +1,6 @@
+Legend Title Size rc parameter
+------------------------------
+
+A new rc parameter has been added as an option in your matplotlibrc allowing you to control the font size of the legend title.
+
+`legend.titlesize = 'large'`
diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
@@ -713,7 +713,7 @@ def __init__(self, parent, handles, labels,
             self.get_frame().set_alpha(framealpha)
 
         self._loc = loc
-        self.set_title(title)
+        self.set_title(title, prop={"size": rcParams["legend.titlesize"]})
         self._last_fontsize_points = self._fontsize
         self._draggable = None
 

diff --git a/lib/matplotlib/rcsetup.py b/lib/matplotlib/rcsetup.py
@@ -1178,6 +1178,7 @@ def _validate_linestyle(ls):
     # the number of points in the legend line for scatter
     'legend.scatterpoints': [1, validate_int],
     'legend.fontsize': ['medium', validate_fontsize],
+    'legend.titlesize': ['medium', validate_fontsize],
      # the relative size of legend markers vs. original
     'legend.markerscale': [1.0, validate_float],
     'legend.shadow': [False, validate_bool],

diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py
@@ -191,6 +191,17 @@ def test_rc():
               title="My legend")
 
 
+def test_rc_title_size():
+    test_legend_title_size = 18.0
+    mpl.rcParams['legend.titlesize'] = test_legend_title_size
+    plt.figure()
+    ax = plt.subplot(121)
+    ax.scatter(np.arange(10), np.arange(10, 0, -1), label='two')
+    leg = ax.legend(loc="center left", bbox_to_anchor=[1.0, 0.5],
+                    title="My legend")
+    assert leg.get_title().get_fontsize() == test_legend_title_size
+
+
 @image_comparison(baseline_images=['legend_expand'], remove_text=True)
 def test_legend_expand():
     'Test expand mode'

diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
@@ -1063,6 +1063,7 @@ class LogFormatterMathtext(LogFormatter):
     """
     Format values for log axis using ``exponent = log_base(value)``.
     """
+    _min_zero_pos = None
 
     def _non_decade_format(self, sign_string, base, fx, usetex):
         'Return string for non-decade locations'
@@ -1076,16 +1077,21 @@ def __call__(self, x, pos=None):
         """
         Return the format for tick value `x`.
 
-        The position `pos` is ignored.
+        The position `pos` is used for SymLogNorm for ensuring
+        only one zero entry is present.
         """
         usetex = rcParams['text.usetex']
         min_exp = rcParams['axes.formatter.min_exponent']
 
         if x == 0:  # Symlog
-            if usetex:
-                return '$0$'
+            if self._min_zero_pos is None:
+                self._min_zero_pos = pos
+                if usetex:
+                    return '$0$'
+                else:
+                    return '$%s$' % _mathdefault('0')
             else:
-                return '$%s$' % _mathdefault('0')
+                return ''
 
         sign_string = '-' if x < 0 else ''
         x = abs(x)

diff --git a/matplotlibrc.template b/matplotlibrc.template
@@ -414,6 +414,7 @@ backend      : $TEMPLATE_BACKEND
 #legend.scatterpoints : 1        # number of scatter points
 #legend.markerscale   : 1.0      # the relative size of legend markers vs. original
 #legend.fontsize      : medium
+#legend.titlesize     : medium    # fontsize of the legend title
 # Dimensions as fraction of fontsize:
 #legend.borderpad     : 0.4      # border whitespace
 #legend.labelspacing  : 0.5      # the vertical space between the legend entries