edges() bugfix

Author: lukelbd

docs/2dplots.ipynb

@@ -257,8 +257,10 @@
     "import proplot as plot\n",
     "import pandas as pd\n",
     "import numpy as np\n",
-    "f, axs = plot.subplots([[1, 1, 2, 2], [0, 3, 3, 0]],\n",
-    "                       axwidth=2, share=1, span=False, hratios=(1, 0.9))\n",
+    "f, axs = plot.subplots(\n",
+    "    [[1, 1, 2, 2], [0, 3, 3, 0]],\n",
+    "    axwidth=2, share=1, span=False, hratios=(1, 0.9)\n",
+    ")\n",
     "state = np.random.RandomState(51423)\n",
     "data = state.rand(6, 6)\n",
     "data = pd.DataFrame(data, index=pd.Index(['a', 'b', 'c', 'd', 'e', 'f']))\n",

proplot/utils.py

@@ -190,6 +190,7 @@ def edges(Z, axis=-1):
     `~numpy.ndarray`
         Array of "edge" coordinates.
     """
+    Z = np.asarray(Z)
     Z = np.swapaxes(Z, axis, -1)
     Z = np.concatenate((
         Z[..., :1] - (Z[..., 1] - Z[..., 0]) / 2,