Add stat_ecdf() function. Tiny fixes in other stat functions.

python-package/lets_plot/plot/stat.py

@@ -5,10 +5,10 @@
 #
 # Stats - functions, drawing attention to the statistical transformation rather than the visual appearance.
 #
-__all__ = ['stat_summary', 'stat_summary_bin']
+__all__ = ['stat_summary', 'stat_summary_bin', 'stat_ecdf']
 
 
-def stat_summary(mapping=None, *, data=None, geom='pointrange',
+def stat_summary(mapping=None, *, data=None, geom=None,
  position=None, show_legend=None, sampling=None, tooltips=None,
  orientation=None,
  fun=None, fun_min=None, fun_max=None,
@@ -152,7 +152,8 @@ def stat_summary(mapping=None, *, data=None, geom='pointrange',
  position=position_nudge(x=.1), color="blue")
 
  """
- return _geom(geom,
+ summary_geom = geom if geom is not None else 'pointrange'
+ return _geom(summary_geom,
  mapping=mapping,
  data=data,
  stat='summary',
@@ -167,7 +168,7 @@ def stat_summary(mapping=None, *, data=None, geom='pointrange',
  **other_args)
 
 
-def stat_summary_bin(mapping=None, *, data=None, geom='pointrange',
+def stat_summary_bin(mapping=None, *, data=None, geom=None,
  position=None, show_legend=None, sampling=None, tooltips=None,
  orientation=None,
  fun=None, fun_min=None, fun_max=None,
@@ -325,7 +326,8 @@ def stat_summary_bin(mapping=None, *, data=None, geom='pointrange',
  geom_point()
 
  """
- return _geom(geom,
+ summary_bin_geom = geom if geom is not None else 'pointrange'
+ return _geom(summary_bin_geom,
  mapping=mapping,
  data=data,
  stat='summarybin',
@@ -340,3 +342,26 @@ def stat_summary_bin(mapping=None, *, data=None, geom='pointrange',
  center=center, boundary=boundary,
  color_by=color_by, fill_by=fill_by,
  **other_args)
+
+
+def stat_ecdf(mapping=None, *, data=None, geom=None,
+ position=None, show_legend=None, sampling=None, tooltips=None,
+ orientation=None,
+ n=None, pad=None,
+ color_by=None,
+ **other_args):
+ ecdf_geom = geom if geom is not None else 'step'
+ ecdf_pad = pad if pad is not None else True
+ return _geom(ecdf_geom,
+ mapping=mapping,
+ data=data,
+ stat='ecdf',
+ position=position,
+ show_legend=show_legend,
+ sampling=sampling,
+ tooltips=tooltips,
+ orientation=orientation,
+ n=n,
+ pad=ecdf_pad,
+ color_by=color_by,
+ **other_args)