Merge pull request #803 from rasbt/depr-res

Remove depr. res from plot_decision_regions

Author: rasbt

docs/sources/CHANGELOG.md

@@ -22,6 +22,7 @@ The CHANGELOG for the current development version is available at
 ##### Changes
 
 - Updates unit tests for scikit-learn 0.24.1 compatibility. ([#774](https://github.com/rasbt/mlxtend/pull/774))
+- Removes deprecated `res` argument from `plot_decision_regions`. ([#803](https://github.com/rasbt/mlxtend/pull/803))
 
 ##### Bug Fixes
 

mlxtend/plotting/decision_regions.py

@@ -49,7 +49,6 @@ def plot_decision_regions(X, y, clf,
                           filler_feature_ranges=None,
                           ax=None,
                           X_highlight=None,
-                          res=None,
                           zoom_factor=1.,
                           legend=1,
                           hide_spines=True,
@@ -93,13 +92,6 @@ def plot_decision_regions(X, y, clf,
         one if ax=None.
     X_highlight : array-like, shape = [n_samples, n_features] (default: None)
         An array with data points that are used to highlight samples in `X`.
-    res : float or array-like, shape = (2,) (default: None)
-        This parameter was used to define the grid width,
-        but it has been deprecated in favor of
-        determining the number of points given the figure DPI and size
-        automatically for optimal results and computational efficiency.
-        To increase the resolution, it's is recommended to use to provide
-        a `dpi argument via matplotlib, e.g., `plt.figure(dpi=600)`.
     zoom_factor : float (default: 1.0)
         Controls the scale of the x- and y-axis of the decision plot.
     hide_spines : bool (default: True)
@@ -135,13 +127,6 @@ def plot_decision_regions(X, y, clf,
     if ax is None:
         ax = plt.gca()
 
-    if res is not None:
-        warnings.warn("The 'res' parameter has been deprecated."
-                      "To increase the resolution, it's is recommended"
-                      "to use to provide a `dpi argument via matplotlib,"
-                      "e.g., `plt.figure(dpi=600)`.",
-                      DeprecationWarning)
-
     plot_testdata = True
     if not isinstance(X_highlight, np.ndarray):
         if X_highlight is not None: