@@ -272,7 +272,7 @@ def plot_implicit(expr, x_var=None, y_var=None, adaptive=True, depth=0,
272272 :format: doctest
273273 :include-source: True
274274
275- >>> plot_implicit(Eq(x**2 + y**2, 5))
275+ >>> p1 = plot_implicit(Eq(x**2 + y**2, 5))
276276
277277 With the range for the symbols:
278278
@@ -281,7 +281,8 @@ def plot_implicit(expr, x_var=None, y_var=None, adaptive=True, depth=0,
281281 :format: doctest
282282 :include-source: True
283283
284- >>> plot_implicit(Eq(x**2 + y**2, 3), (x, -3, 3), (y, -3, 3))
284+ >>> p2 = plot_implicit(
285+ ... Eq(x**2 + y**2, 3), (x, -3, 3), (y, -3, 3))
285286
286287 With depth of recursion as argument:
287288
@@ -290,7 +291,7 @@ def plot_implicit(expr, x_var=None, y_var=None, adaptive=True, depth=0,
290291 :format: doctest
291292 :include-source: True
292293
293- >>> plot_implicit(
294+ >>> p3 = plot_implicit(
294295 ... Eq(x**2 + y**2, 5), (x, -4, 4), (y, -4, 4), depth = 2)
295296
296297 Using mesh grid and not using adaptive meshing:
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