Merge pull request #5060 from jorisvandenbossche/scatter-color

VIS: let scatter plots obey mpl color scheme (#3338)

Author: jreback

pandas/tools/plotting.py

@@ -229,6 +229,7 @@ def scatter_matrix(frame, alpha=0.5, figsize=None, ax=None, grid=False,
     >>> df = DataFrame(np.random.randn(1000, 4), columns=['A','B','C','D'])
     >>> scatter_matrix(df, alpha=0.2)
     """
+    import matplotlib.pyplot as plt
     from matplotlib.artist import setp
 
     df = frame._get_numeric_data()
@@ -246,6 +247,9 @@ def scatter_matrix(frame, alpha=0.5, figsize=None, ax=None, grid=False,
     hist_kwds = hist_kwds or {}
     density_kwds = density_kwds or {}
 
+    # workaround because `c='b'` is hardcoded in matplotlibs scatter method
+    kwds.setdefault('c', plt.rcParams['patch.facecolor'])
+
     for i, a in zip(lrange(n), df.columns):
         for j, b in zip(lrange(n), df.columns):
             ax = axes[i, j]
@@ -653,6 +657,10 @@ def lag_plot(series, lag=1, ax=None, **kwds):
     ax: Matplotlib axis object
     """
     import matplotlib.pyplot as plt
+    
+    # workaround because `c='b'` is hardcoded in matplotlibs scatter method
+    kwds.setdefault('c', plt.rcParams['patch.facecolor'])
+    
     data = series.values
     y1 = data[:-lag]
     y2 = data[lag:]
@@ -1889,6 +1897,9 @@ def scatter_plot(data, x, y, by=None, ax=None, figsize=None, grid=False, **kwarg
     """
     import matplotlib.pyplot as plt
 
+    # workaround because `c='b'` is hardcoded in matplotlibs scatter method
+    kwargs.setdefault('c', plt.rcParams['patch.facecolor'])
+
     def plot_group(group, ax):
         xvals = group[x].values
         yvals = group[y].values