BUG: optimize: adds tests for bug scipy#10124

mdhaber · May 4, 2019 · 5ecde58 · 5ecde58
1 parent 1aa30dc
commit 5ecde58
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Showing 2 changed files with 20 additions and 1 deletion.
diff --git a/scipy/optimize/_linprog_rs.py b/scipy/optimize/_linprog_rs.py
@@ -340,7 +340,7 @@ def _phase_two(c, A, x, b, maxiter, tol, maxupdate, mast, pivot, iteration=0,
             else:
                 phase = 2
                 x_postsolve = x
-            x_o, fun, slack, con, _, _ = _postsolve(x_postsolve.copy()), *_T_o,
+            x_o, fun, slack, con, _, _ = _postsolve(x_postsolve.copy(), *_T_o,
                                                     tol=tol)
 
             if callback is not None:

diff --git a/scipy/optimize/tests/test_linprog.py b/scipy/optimize/tests/test_linprog.py
@@ -1301,6 +1301,25 @@ def test_bug_8973_2(self):
                       method=self.method, options=self.options)
         _assert_success(res, desired_x=[-2], desired_fun=0)
 
+    def test_bug_10124(self):
+        """
+        Test for linprog docstring problem
+        'disp'=True caused revised simplex failure
+        """
+        c = np.zeros(1)
+        A_ub = np.array([[1]])
+        b_ub = np.array([-2])
+        bounds = (None, None)
+        c = [-1, 4]
+        A_ub = [[-3, 1], [1, 2]]
+        b_ub = [6, 4]
+        bounds = [(None, None), (-3, None)]
+        o = {"disp": True}
+        o.update(self.options)
+        res = linprog(c, A_ub, b_ub, A_eq, b_eq, bounds,
+                      method=self.method, options=self.options)
+        _assert_success(res, desired_x=[10, -3], desired_fun=-22)
+
 #########################
 # Method-specific Tests #
 #########################