{"action":"opened","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/9654","labels_url":"https://api.github.com/repos/sympy/sympy/issues/9654/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/9654/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/9654/events","html_url":"https://github.com/sympy/sympy/issues/9654","id":94501335,"number":9654,"title":"Problem plotting 3D figure with piecewise","user":{"login":"KhaoticMind","id":6423413,"avatar_url":"https://avatars.githubusercontent.com/u/6423413?v=3","gravatar_id":"","url":"https://api.github.com/users/KhaoticMind","html_url":"https://github.com/KhaoticMind","followers_url":"https://api.github.com/users/KhaoticMind/followers","following_url":"https://api.github.com/users/KhaoticMind/following{/other_user}","gists_url":"https://api.github.com/users/KhaoticMind/gists{/gist_id}","starred_url":"https://api.github.com/users/KhaoticMind/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/KhaoticMind/subscriptions","organizations_url":"https://api.github.com/users/KhaoticMind/orgs","repos_url":"https://api.github.com/users/KhaoticMind/repos","events_url":"https://api.github.com/users/KhaoticMind/events{/privacy}","received_events_url":"https://api.github.com/users/KhaoticMind/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-07-11T19:36:35Z","updated_at":"2015-07-11T19:36:35Z","closed_at":null,"body":"I'm filling this bug as suggested on an error message I'm getting when trying to plot a 3D function, with the code bellow:\r\n\r\n```python\r\nimport sympy\r\nsympy.init_session()\r\nfrom sympy.plotting.plot import *\r\nplot3d( Piecewise( (1, And(2<= x, x <= 3, 2<= y, y <= 3)), (0, True)  ), (x, 0, 5), (y, 0, 5))\r\n```\r\nGives me the following error:\r\n\r\n*D:\\Miniconda3\\lib\\site-packages\\sympy\\plotting\\experimental_lambdify.py:165: UserWarning: The evaluation of the expression is problematic. We are trying a failback method that may still work. Please report this as a bug.*\r\n\r\nIn the end the plot shows alright (the alternative method seens to work).\r\nI\r\nI'm running sympy 0.7.6 on windows with anaconda:\r\n\r\n```\r\nC:\\Users\\AntonioAugusto>conda list\r\n# packages in environment at d:\\Miniconda3:\r\n#\r\nalabaster                 0.7.3                    py34_0\r\nbabel                     1.3                      py34_0\r\ncertifi                   14.05.14                 py34_0\r\ncolorama                  0.3.3                    py34_0\r\nconda                     3.14.1                   py34_0\r\nconda-env                 2.3.0                    py34_0\r\ndecorator                 3.4.2                    py34_0\r\ndocutils                  0.12                     py34_1\r\nipython                   3.2.0                    py34_0\r\nipython-notebook          3.2.0                    py34_0\r\njedi                      0.8.1                    py34_0\r\njinja2                    2.7.3                    py34_2\r\njsonschema                2.4.0                    py34_0\r\nmarkupsafe                0.23                     py34_0\r\nmathjax                   2.2                           0\r\nmatplotlib                1.4.3                np19py34_1\r\nmenuinst                  1.0.4                    py34_0\r\nmistune                   0.6                      py34_0\r\nnetworkx                  1.9.1                    py34_0\r\nnose                      1.3.7                    py34_0\r\nnumpy                     1.9.2                    py34_0\r\npandas                    0.16.2               np19py34_0\r\npep8                      1.6.2                    py34_0\r\npip                       7.1.0                    py34_0\r\npsutil                    2.2.1                    py34_0\r\npycosat                   0.6.1                    py34_0\r\npyflakes                  0.9.2                    py34_0\r\npygments                  2.0.2                    py34_0\r\npyparsing                 2.0.3                    py34_0\r\npyqt                      4.10.4                   py34_1\r\npyreadline                2.0                      py34_0\r\npython                    3.4.3                         0\r\npython-dateutil           2.4.2                    py34_0\r\npytz                      2015.4                   py34_0\r\npyyaml                    3.11                     py34_1\r\npyzmq                     14.7.0                   py34_0\r\nrequests                  2.7.0                    py34_0\r\nrope                      0.9.4                    py34_1\r\nrope-py3k-0.9.4           1                         <pip>\r\nscikit-learn              0.16.1               np19py34_0\r\nscipy                     0.15.1               np19py34_0\r\nseaborn                   0.6.0                np19py34_0\r\nsetuptools                18.0.1                   py34_0\r\nsix                       1.9.0                    py34_0\r\nsnowballstemmer           1.2.0                    py34_0\r\nsphinx                    1.3.1                    py34_0\r\nsphinx-rtd-theme          0.1.7                     <pip>\r\nsphinx_rtd_theme          0.1.7                    py34_0\r\nspyder                    2.3.5.2                  py34_0\r\nsympy                     0.7.6                    py34_0\r\ntornado                   4.2                      py34_0\r\n\r\nC:\\Users\\AntonioAugusto>\r\n```"}}